{
  "data": {
    "a": {
      "slug": "claude-mythos-5-2",
      "name": "Claude Mythos 5.2",
      "vendor": "Anthropic",
      "vendorUrl": "https://www.anthropic.com",
      "kind": "model",
      "category": "inference",
      "summary": "Claude Mythos 5.2 is the same model as Claude Fable 5.2 without Fable's stronger cyber and biology safeguards, for organisations Anthropic verifies, with a 1M-token context, text and images in, at $8 and $40 per million tokens.",
      "url": "https://www.anchorterminal.com/tools/claude-mythos-5-2",
      "markdownUrl": "https://www.anchorterminal.com/tools/claude-mythos-5-2.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/claude-mythos-5-2.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/claude-mythos-5-2.json",
      "dns": "claude-mythos-5-2.grade.anchorterminal.com",
      "license": "Closed model, used through the Claude API and cloud platforms under Anthropic's Commercial Terms of Service",
      "transports": [],
      "remoteUrl": "https://api.anthropic.com/v1",
      "packages": [],
      "auth": "api-key",
      "authNotes": "A Claude API key from the Console, sent as `x-api-key` or a bearer token with `anthropic-version`, per the Claude API listing. Access to claude-mythos-5-2 needs the organisation verified through one of Anthropic's programmes, the Cyber Verification Program or the Life Sciences Verification Program, applied for in a form and decided by Anthropic.",
      "pricing": "usage",
      "pricingNotes": "$8 per million input tokens, $40 output, cache writes $10 (5 minutes) or $16 (1 hour), cache reads $0.20, batch at half price, fast mode $16 and $80. Requires 30-day retention. Only after verification. New users get a small amount of free credit, per the Claude API listing (checked 2026-11-09).",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 on Anthropic's pricing page, which bills tokens to a Console account (checked 2026-11-09).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-11-09"
      },
      "docsUrl": "https://platform.claude.com/docs/en/models/mythos-5-2/overview",
      "llmsTxt": "https://platform.claude.com/llms.txt",
      "capabilities": [
        "inference.llm"
      ],
      "tags": [
        "official",
        "hosted",
        "model",
        "multimodal",
        "vision",
        "reasoning",
        "long-context",
        "tool-calling",
        "usage-priced",
        "card-required",
        "closed-source",
        "llms-txt",
        "new",
        "approval-required",
        "gated"
      ],
      "lastRelease": "2026-11-09",
      "graded": true,
      "disclosure": "Anthropic makes the models this research run and the review panel run on. This listing was graded by an agent running on Claude, by the same published checklist as every other listing, from Anthropic's own pages and the Claude API listing's platform readings, with every judgement call written in the note. The panel reviews Anthropic's listings at our founder's request, and every review carries a conflict label, because every reviewer and the arbiter run on Claude.",
      "anchor": {
        "graded": true,
        "score": 77.3,
        "grade": "BB",
        "agentReady": true,
        "rank": 70,
        "ranked": true,
        "rankOf": 1524,
        "categoryRank": 8,
        "methodology": "0.8",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 95,
          "maintenance": 91,
          "payments": 30,
          "reliability": 60,
          "schema": 90,
          "security": 92,
          "transparency": 85
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-11-09"
        },
        "negative": 0,
        "verdict": "Fable 5.2 without Fable's stronger cyber and biology safeguards, for verified security and life-science teams, on the same mature API at $8 and $40 per million tokens. Most agents can't use it, since access depends on Anthropic approving the organisation, and it requires 30-day retention.",
        "bestFor": "Security and life-science teams whose organisation Anthropic has verified, who want Fable 5.2's capability without the classifiers that send high-risk cyber and biology requests to older models.",
        "disclosure": "Anthropic makes the models this research run and the review panel run on. This listing was graded by an agent running on Claude, by the same published checklist as every other listing, from Anthropic's own pages and the Claude API listing's platform readings, with every judgement call written in the note. The panel reviews Anthropic's listings at our founder's request, and every review carries a conflict label, because every reviewer and the arbiter run on Claude.",
        "strengths": [
          "$8 input and $40 output per million tokens, 20% below Fable 5.1, with cache reads at 2.5% of input",
          "1M-token context and 128K output, text and images in",
          "On the Claude API, Bedrock, Google Cloud and Microsoft Foundry once the organisation is verified",
          "The Claude API's status page, per-model rate limits, SDKs in seven languages and 60-day retirement notice",
          "Retirement not before 9 November 2027, stated on the model page"
        ],
        "weaknesses": [
          "Only for organisations Anthropic verifies, so an agent can't start on it alone",
          "Adaptive thinking is always on and can't be turned off",
          "Forced tool use (tool_choice any or tool) and sampling parameters return a 400",
          "Requires 30-day data retention and is outside zero data retention unless Anthropic authorises it",
          "Benchmark figures are Anthropic's own"
        ],
        "agentNotes": [
          "Confirm your organisation is verified before routing work here; otherwise use claude-fable-5-2",
          "Call https://api.anthropic.com/v1/messages with model claude-mythos-5-2 and your key",
          "Steer thinking with the effort parameter (default high); don't send temperature, top_p or top_k",
          "Don't force a tool with tool_choice any or tool; describe the tool and let the model choose",
          "Thinking blocks from it are read only by Fable 5.2 and Mythos 5.2, so keep them out of other models' context",
          "Check data retention before sending regulated data, since 30 days is required"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "BB",
            "methodology": "0.8",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 77.3
          }
        ],
        "editorialScores": {
          "ergonomics": 95,
          "maintenance": 91,
          "payments": 30,
          "reliability": 60,
          "schema": 90,
          "security": 92,
          "transparency": 75
        },
        "provenanceScore": 95,
        "checked": {
          "categories": {
            "ergonomics": "2026-11-09",
            "maintenance": "2026-11-09",
            "payments": "2026-11-09",
            "reliability": "2026-11-09",
            "schema": "2026-11-09",
            "security": "2026-11-09",
            "transparency": "2026-11-09"
          },
          "last": "2026-11-09",
          "lastMoved": "2026-11-13",
          "oldest": "2026-11-09",
          "stale": false,
          "staleAfterDays": 90
        }
      },
      "connect": {
        "http": "curl https://api.anthropic.com/v1/messages \\\n  -H \"x-api-key: $ANTHROPIC_API_KEY\" -H \"anthropic-version: 2023-06-01\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"model\":\"claude-mythos-5-2\",\"max_tokens\":1024,\"messages\":[{\"role\":\"user\",\"content\":\"hello\"}]}'"
      },
      "letme": {
        "capability": "https://letme.dev/inference.llm",
        "tool": "https://letme.dev/claude-mythos-5-2"
      },
      "sameCompany": [
        "claude-agent-sdk",
        "claude-code",
        "claude-duet"
      ],
      "sameModel": [
        "anthropic-api",
        "claude-fable-5-2"
      ],
      "area": "models",
      "unitPrices": [
        {
          "item": "Claude Mythos 5.2 input",
          "unit": "1m-tokens",
          "usd": 8,
          "note": "Fast mode $16"
        },
        {
          "item": "Claude Mythos 5.2 cached input",
          "unit": "1m-tokens",
          "usd": 0.2,
          "note": "0.025x input; 5-minute write $10, 1-hour write $16"
        },
        {
          "item": "Claude Mythos 5.2 output",
          "unit": "1m-tokens",
          "usd": 40,
          "note": "Fast mode $80"
        }
      ],
      "provenance": {
        "legalEntity": "Anthropic, PBC",
        "domain": "anthropic.com",
        "domainRegistered": "2001-10-02",
        "domainNote": "The API is on anthropic.com. anthropic.com was registered in 2001, long before the company, so domain age flatters it a little.",
        "endpointOnVendorDomain": true,
        "terms": "https://www.anthropic.com/legal/commercial-terms",
        "privacy": "https://www.anthropic.com/legal/privacy",
        "statusPage": "https://status.claude.com",
        "changelog": "https://platform.claude.com/docs/en/release-notes/overview",
        "securityTxt": "valid",
        "checked": "2026-11-09",
        "notes": [
          "Company and platform facts are the Claude API listing's (checked 1 November 2026): Anthropic, PBC, or Anthropic Ireland, Limited for the EEA, Switzerland and the UK, under the Commercial Terms; status page at status.claude.com; dated release notes; security.txt valid to 2026-12-31.",
          "www.anthropic.com's and platform.claude.com's robots.txt allow our reader on the pages read on 9 November (platform.claude.com disallows only /api/). domainRegistered is carried from the Claude API listing's RDAP reading."
        ],
        "score": 95
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/claude-mythos-5-2.json",
      "live": {
        "slug": "claude-mythos-5-2",
        "probe": {
          "target": "https://api.anthropic.com/v1",
          "method": "get",
          "lastAt": "2026-11-14T00:27:48.091237113Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 113,
          "authRequired": false,
          "uptime24h": 99.58,
          "uptime30d": 99.9,
          "p50ms24h": 125,
          "p95ms24h": 201,
          "samples24h": 238,
          "samples30d": 971,
          "days": [
            {
              "date": "2026-11-10",
              "probes": 239,
              "ok": 239
            },
            {
              "date": "2026-11-11",
              "probes": 244,
              "ok": 244
            },
            {
              "date": "2026-11-12",
              "probes": 245,
              "ok": 245
            },
            {
              "date": "2026-11-13",
              "probes": 238,
              "ok": 237
            },
            {
              "date": "2026-11-14",
              "probes": 5,
              "ok": 5
            }
          ],
          "since": "2026-11-10T00:33:00.829119768Z"
        },
        "vendorStatus": {
          "page": "https://status.claude.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-11-14T00:29:29.438831738Z"
        },
        "securityTxt": {
          "url": "https://anthropic.com/.well-known/security.txt",
          "state": "valid",
          "expires": "2027-11-01T00:00:00.000Z",
          "checkedAt": "2026-11-13T16:17:29.766250321Z"
        },
        "llmsTxt": {
          "url": "https://platform.claude.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-11-13T15:53:36.958138021Z"
        },
        "updatedAt": "2026-11-14T00:29:29.438831738Z"
      },
      "streak": {
        "days": 4,
        "from": "2026-11-10",
        "sinceWatching": true,
        "best": 4
      }
    },
    "answer": "Claude Mythos 5.2 scores 77.3 (BB) on agent readiness against Gemini 4 Hydrogen's 64.9 (B), and leads in 6 of 7 scored categories. Gemini 4 Hydrogen leads on payments \u0026 pricing.",
    "b": {
      "slug": "gemini-4-hydrogen",
      "name": "Gemini 4 Hydrogen",
      "vendor": "Google",
      "vendorUrl": "https://ai.google.dev",
      "kind": "model",
      "category": "inference",
      "summary": "Gemini 4 Hydrogen is Google's fast, lower-cost Gemini 4 model for everyday coding and agent work, on every tier of the Gemini API with a 1,048,576-token limit shared between input and output.",
      "url": "https://www.anchorterminal.com/tools/gemini-4-hydrogen",
      "markdownUrl": "https://www.anchorterminal.com/tools/gemini-4-hydrogen.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/gemini-4-hydrogen.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/gemini-4-hydrogen.json",
      "dns": "gemini-4-hydrogen.grade.anchorterminal.com",
      "license": "Closed model, used through the Gemini API and Google's apps under Google's terms",
      "transports": [],
      "remoteUrl": "https://generativelanguage.googleapis.com/v1beta",
      "packages": [],
      "auth": "api-key",
      "authNotes": "An `x-goog-api-key` from AI Studio. Google's announcement puts Hydrogen on all tiers of AI Studio and the Gemini API, so a free-tier key with no billing works, per that post and the Gemini API listing's reading of the free tier. Paid Google AI Pro and Ultra subscribers can use it in Antigravity. On Google Cloud it's `gemini-4-hydrogen` on the Agent Platform, with Cloud credentials.",
      "pricing": "usage",
      "pricingNotes": "Google's announcement gives $1.50 per million input tokens and $7.50 output, flat across the whole 1M-token window, and names no introductory period, cached-input or batch price. Every processed token is billed, thinking included. Hydrogen's free-tier limits are on the Gemini API pricing page, now at aistudio.google.com, not yet read (checked 2026-11-13).",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No machine payment. Paid use needs billing on a Cloud project, per the Gemini API listing (checked 2026-11-13).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-11-13"
      },
      "docsUrl": "https://docs.cloud.google.com/gemini-enterprise-agent-platform/models/guides/gemini-4-hydrogen",
      "llmsTxt": "https://ai.google.dev/gemini-api/docs/llms.txt",
      "capabilities": [
        "inference.llm"
      ],
      "tags": [
        "official",
        "hosted",
        "model",
        "multimodal",
        "reasoning",
        "long-context",
        "tool-calling",
        "usage-priced",
        "free-tier",
        "closed-source",
        "llms-txt",
        "new"
      ],
      "lastRelease": "2026-11-12",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 64.9,
        "grade": "B",
        "agentReady": false,
        "rank": 546,
        "ranked": true,
        "rankOf": 1524,
        "categoryRank": 23,
        "methodology": "0.8",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 90,
          "maintenance": 85,
          "payments": 40,
          "reliability": 45,
          "schema": 85,
          "security": 50,
          "transparency": 72
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-11-13"
        },
        "negative": 0,
        "verdict": "Google's fast Gemini 4 model, on every tier of the Gemini API including the free one, at $1.50 and $7.50 per million tokens with a 1M-token budget, four thinking levels, function calling and structured output. Sampling parameters are ignored, explicit caching isn't supported, it's a short-term release with 45 days' notice on Cloud, and the benchmarks are Google's.",
        "bestFor": "Agents doing everyday coding, tool calls and document work at volume on the Gemini API, including ones that need to start on a free key, or as the executor beside Carbon or Argon.",
        "strengths": [
          "On the free tier of the Gemini API, unlike Carbon and Argon",
          "$1.50 input and $7.50 output per million tokens, flat across the 1M-token window",
          "1,048,576 tokens shared between input and output, with long decodes to the full budget",
          "Four thinking levels, function calling, structured output, code execution, grounding and computer use",
          "The same API, keys and SDKs as Argon and Carbon, plus an OpenAI-compatible surface, so switching is a model ID"
        ],
        "weaknesses": [
          "temperature, top_p and top_k are ignored, and thinking_budget, MINIMAL, penalties and extra candidates return a 400",
          "No explicit context caching or prefilled model turns, and strict thought-signature rules on parallel calls",
          "A short-term release, with a minimum of 45 days' notice before retirement on Google Cloud",
          "Free-tier content is used to improve Google's products and may be read by people",
          "Benchmark figures are Google's own, and the model card says jailbreak resistance is still being improved"
        ],
        "agentNotes": [
          "Call generateContent at https://generativelanguage.googleapis.com/v1beta with model gemini-4-hydrogen and an x-goog-api-key",
          "Set thinking_level instead of thinking_budget; the default is HIGH, so set MEDIUM to keep 3.8 Flash's latency",
          "Don't send temperature, top_p, top_k, penalties or candidate_count above 1",
          "Pass every thought_signature back in its original part, on the first parallel functionCall only, or the call returns a 400",
          "Put static content of 4,096 tokens or more first so implicit caching applies, and keep confidential prompts off the free tier"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.8",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 64.9
          }
        ],
        "editorialScores": {
          "ergonomics": 90,
          "maintenance": 85,
          "payments": 40,
          "reliability": 45,
          "schema": 85,
          "security": 50,
          "transparency": 55
        },
        "provenanceScore": 89,
        "checked": {
          "categories": {
            "ergonomics": "2026-11-13",
            "maintenance": "2026-11-13",
            "payments": "2026-11-13",
            "reliability": "2026-11-13",
            "schema": "2026-11-13",
            "security": "2026-11-13",
            "transparency": "2026-11-13"
          },
          "last": "2026-11-13",
          "oldest": "2026-11-13",
          "stale": false,
          "staleAfterDays": 90
        }
      },
      "connect": {
        "http": "curl \"https://generativelanguage.googleapis.com/v1beta/models/gemini-4-hydrogen:generateContent\" \\\n  -H \"x-goog-api-key: $GEMINI_API_KEY\" -H \"content-type: application/json\" \\\n  -d '{\"contents\":[{\"parts\":[{\"text\":\"hello\"}]}]}'"
      },
      "letme": {
        "capability": "https://letme.dev/inference.llm",
        "tool": "https://letme.dev/gemini-4-hydrogen"
      },
      "sameCompany": [
        "gemini-4-carbon",
        "vertex-ai",
        "embeddinggemma-2",
        "embeddinggemma-300m",
        "gemini-embedding",
        "vertex-ai-tuning",
        "cloud-run-gpus",
        "google-model-armor",
        "shieldgemma",
        "google-imagen",
        "gemini-omni-1-2-flash",
        "google-veo",
        "google-lyria",
        "google-speech-to-text",
        "google-cloud-tts",
        "gemini-live",
        "google-adk",
        "google-memory-bank",
        "google-secret-manager",
        "google-cloud-document-ai",
        "google-weather-api",
        "chrome-devtools-mcp",
        "puppeteer",
        "mcp-toolbox-databases",
        "google-maps-platform",
        "google-cloud-translation",
        "google-calendar-api",
        "firebase-cloud-messaging",
        "google-cloud-storage",
        "google-drive-api",
        "gemini-enterprise",
        "gemini-decision-1",
        "antigravity-cli",
        "gemini-cli",
        "harness2",
        "jules",
        "gemini-spark",
        "google-search-console",
        "google-ads-api",
        "google-forms",
        "google-sheets-api",
        "gmail-api",
        "google-people-api",
        "diffusiongemma-26b-a4b-it",
        "gemma-4-12b-it",
        "gemma-4-26b-a4b-it",
        "gemma-4-31b-it",
        "gemma-4-e2b-it",
        "gemma-4-e4b-it",
        "virustotal"
      ],
      "sameModel": [
        "gemini-api"
      ],
      "area": "models",
      "unitPrices": [
        {
          "item": "Gemini 4 Hydrogen input",
          "unit": "1m-tokens",
          "usd": 1.5,
          "note": "Flat across the 1M window"
        },
        {
          "item": "Gemini 4 Hydrogen output",
          "unit": "1m-tokens",
          "usd": 7.5,
          "note": "Thinking tokens included"
        }
      ],
      "provenance": {
        "legalEntity": "Google LLC",
        "domain": "google.com",
        "domainRegistered": "1997-09-15",
        "domainNote": "The endpoint is on googleapis.com, Google's API domain. google.com was registered in 1997.",
        "endpointOnVendorDomain": true,
        "terms": "https://ai.google.dev/gemini-api/terms",
        "privacy": "https://policies.google.com/privacy",
        "statusPage": "https://aistudio.google.com/status",
        "changelog": "https://ai.google.dev/gemini-api/docs/changelog",
        "securityTxt": "valid",
        "checked": "2026-11-13",
        "score": 89
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/gemini-4-hydrogen.json",
      "live": {
        "slug": "gemini-4-hydrogen",
        "probe": {
          "target": "https://generativelanguage.googleapis.com/v1beta",
          "method": "get",
          "lastAt": "2026-11-14T00:27:54.542358891Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 29,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 33,
          "p95ms24h": 85,
          "samples24h": 37,
          "samples30d": 37,
          "days": [
            {
              "date": "2026-11-13",
              "probes": 32,
              "ok": 32
            },
            {
              "date": "2026-11-14",
              "probes": 5,
              "ok": 5
            }
          ],
          "since": "2026-11-13T20:58:02.850712558Z"
        },
        "vendorStatus": {
          "page": "https://aistudio.google.com/status",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-11-13T23:54:32.148379631Z"
        },
        "updatedAt": "2026-11-14T00:27:54.542358891Z"
      },
      "streak": {
        "days": 1,
        "from": "2026-11-13",
        "sinceWatching": true,
        "best": 1
      }
    },
    "edges": [
      {
        "by": 42,
        "category": "security",
        "leads": "claude-mythos-5-2",
        "name": "Security \u0026 auth",
        "reasons": {
          "a": "Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Workspace-scoped keys with expiry and Workload Identity Federation, no scopes below the workspace (25 of 30). No training on API data without express permission (20). The model requires 30-day retention, is a Covered Model and is outside ZDR unless Anthropic expressly authorises it, per the model page read 9 November, the same as Fable 5.1 (12 of 15). Usage and cost analytics, Compliance API and OpenTelemetry export (15). security.txt, HackerOne and SOC 2, ISO 27001 and ISO 42001 (20). Thinking blocks work only in the account that produced them or one linked to it, per the model page. 25 + 20 + 12 + 15 + 20 = 92.",
          "b": "Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Keys bound to a service account and restricted to the Gemini API, with no scopes and a token accepted in the URL (15 of 30, the platform's deduction). Hydrogen is on the free tier, where Google's terms say content is used to improve products and may be read by humans; paid-tier content isn't (10 of 20, the platform's reading; Carbon, paid tier only, got 15). Abuse retention has no number and new paid projects store requests by default since 26 October; Google's prompt-injection figure (2.3 times more resilient on Gray Swan's benchmark) is its own, and the model card says jailbreak resistance is still being improved (5 of 15). Request logs for billed projects (15). security.txt and a reward programme, no certification naming the API (5 of 20). 15 + 10 + 5 + 15 + 5 = 50."
        },
        "scores": {
          "a": 92,
          "b": 50
        }
      },
      {
        "by": 15,
        "category": "reliability",
        "leads": "claude-mythos-5-2",
        "name": "Reliability",
        "reasons": {
          "a": "Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Status page at status.claude.com with component history (20). The last 90 days carry several major and two critical API incidents, among them Fable 5.1 and Mythos 5.1 on 3 September and Fable 5.1 on 23 and 25 October, so 0 for incident history. Rate limits published per model, Fable 5.x at 4,000 requests a minute at the Start tier (15). 429s with `retry-after` and SDK retries with backoff (15). No SLA on sale (0). The model page lists it as a current model with no preview label (10). 20 + 0 + 15 + 15 + 0 + 10 = 60. Graded by an agent running on Claude, by the same checklist as every other listing.",
          "b": "Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Status page at aistudio.google.com/status with no readable components or history (10 of 20) and no readable incident record (5 of 30). Rate-limit tiers and spend limits published, per-model limits in AI Studio (5 of 15). Backoff guidance for 429 and 503 and SDK retries (15). No SLA (0). Google Cloud's release notes and model page call Hydrogen generally available, a short-term release, under the same model ID; the Gemini API pages read don't name a stage, so full marks rest on Cloud's statement (10, a judgement call; Carbon, with no stage stated anywhere, got 5). 10 + 5 + 5 + 15 + 0 + 10 = 45."
        },
        "scores": {
          "a": 60,
          "b": 45
        }
      },
      {
        "by": 13,
        "category": "transparency",
        "leads": "claude-mythos-5-2",
        "name": "Transparency \u0026 trust",
        "reasons": {
          "a": "Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Commercial Terms with named contracting parties and Apache 2.0 SDKs (15). Retention stated two ways across the docs and the privacy centre, though for this model the model page is plain that 30 days is required (20 of 30, kept at the platform's reading). Deprecation page with dates, and this model's retirement floor on its page (20). Processing countries and subprocessors named (20). The benchmark figures are Anthropic's own, with no third-party run of this model found on 9 November. 15 + 20 + 20 + 20 = 75.",
          "b": "Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Closed service with clear terms, SDKs Apache-2.0 (15). Free-tier content is used to improve products, paid-tier content isn't, abuse retention has no number, and request storage is on by default for new paid projects; the statements agree with each other (20 of 30). Deprecations table, and a stated 45-day minimum on Cloud (15 of 20). Data may be cached anywhere Google has facilities; no subprocessor list checked (5 of 20). A DeepMind model card gives a March 2026 knowledge cutoff, automated safety results and Frontier Safety Framework outcomes, with the full safety report marked coming soon. Every benchmark figure is Google's own. 15 + 20 + 15 + 5 = 55."
        },
        "scores": {
          "a": 85,
          "b": 72
        }
      },
      {
        "by": 10,
        "category": "payments",
        "leads": "gemini-4-hydrogen",
        "name": "Payments \u0026 pricing",
        "reasons": {
          "a": "Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. No machine payment protocol on the pricing page, read 9 November (0). Per-token prices published without a login, $8 and $40, the same as Fable 5.2 (20). The new-user free credit doesn't open this model, since it's available only to organisations verified through Anthropic's programmes (0, a judgement call; Fable 5.2 keeps the Claude API's 10). Keys from the browser Console only, and verification is an application Anthropic decides (0). 0 + 20 + 0 + 0 = 20. Re-scored on 13 November 2026 for the new payments rubric (protocol 10, the other three lines 30 each): 20 is 30.",
          "b": "Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. No machine payment protocol (0). Prices published in Google's announcement without a login, $1.50 input and $7.50 output per million tokens, flat across the window; the Gemini API pricing page, now at aistudio.google.com, is still to be read for Hydrogen's row (20). A free tier with no card: Google's announcement puts Hydrogen on all tiers of the Gemini API, and the free tier needs no billing account per the gemini-api listing; its limits for Hydrogen are on that pricing page (20). A Google account and AI Studio for a key (0). 0 + 20 + 20 + 0 = 40."
        },
        "scores": {
          "a": 30,
          "b": 40
        }
      },
      {
        "by": 6,
        "category": "maintenance",
        "leads": "claude-mythos-5-2",
        "name": "Maintenance \u0026 community",
        "reasons": {
          "a": "Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Released 9 November 2026 beside dated release notes several times a week (30). 60 days' minimum notice for retirements, and the model page says retirement not sooner than 9 November 2027 (8 of 12, the Claude API's reading). Model shutdowns kept to notice (8). Support centre and dated notes (15). The sampled SDK issue without a reply, per the 1 October check (5 of 10). Current SDKs (15). Runtimes stated (10). 30 + 8 + 8 + 15 + 5 + 15 + 10 = 91.",
          "b": "Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Released on 12 November 2026, recorded in Google Cloud's release notes; the Gemini API changelog, last updated 30 October, has no entry for it yet (30). Google Cloud states a minimum of 45 days' notice before Hydrogen is retired, short and stated for Cloud only; the Gemini API's deprecations give earliest dates with no stated minimum (6 of 12). Shutdowns in the last 90 days kept to their table (4 of 8). Dated changelog (15). SDK replies not sampled (5 of 10). Current SDKs; the developer guide names the minimum google-genai, @google/genai, Go and Java versions (15). Runtimes stated (10). 30 + 6 + 4 + 15 + 5 + 15 + 10 = 85."
        },
        "scores": {
          "a": 91,
          "b": 85
        }
      },
      {
        "by": 5,
        "category": "schema",
        "leads": "claude-mythos-5-2",
        "name": "Schema \u0026 documentation",
        "reasons": {
          "a": "Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. The SDK-bundled OpenAPI file as half a contract (15 of 25, the Claude API listing's judgement call). llms.txt with Markdown twins (10). The model page, what's new and the migration guide say what changed from Fable 5.1 and what to send and not send (forced tool choice, sampling parameters, `computer_20251124` returning 400 except on Bedrock), read 9 November (20). Structured outputs and strict tools GA (15). Documented error types with `request_id` (15). `anthropic-version` and dated release notes (15). 15 + 10 + 20 + 15 + 15 + 15 = 90.",
          "b": "Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Discovery document for GenerateContent (20 of 25). llms.txt with Markdown twins (10). The Cloud developer guide says what Hydrogen takes, every parameter that's ignored or returns 400, the thought-signature rules and how to migrate from Gemini 3.8 Flash, though it doesn't document forced calls (15 of 20). Structured output to a JSON Schema with some keywords not enforced (10 of 15). Examples and an errors page (15). Dated changelog and model versions (15). 20 + 10 + 15 + 10 + 15 + 15 = 85."
        },
        "scores": {
          "a": 90,
          "b": 85
        }
      }
    ],
    "facts": [
      {
        "a": "Model API",
        "b": "Model API",
        "name": "Kind"
      },
      {
        "a": "Anthropic",
        "b": "Google",
        "name": "Vendor"
      },
      {
        "a": "https://api.anthropic.com/v1",
        "b": "https://generativelanguage.googleapis.com/v1beta",
        "name": "Hosted endpoint"
      },
      {
        "a": "",
        "b": "",
        "name": "Transports"
      },
      {
        "a": "API key",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Pay per use",
        "b": "Pay per use",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Closed model, used through the Claude API and cloud platforms under Anthropic's Commercial Terms of Service",
        "b": "Closed model, used through the Gemini API and Google's apps under Google's terms",
        "name": "Licence"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-11-09",
        "b": "2026-11-12",
        "name": "Last release"
      },
      {
        "a": "no date given",
        "b": "2026-04-28",
        "name": "Terms last updated"
      },
      {
        "a": "no date given",
        "b": "2026-10-01",
        "name": "Privacy policy last updated"
      },
      {
        "a": "yes, with an opt-out",
        "b": "yes",
        "name": "Customer content may train models"
      },
      {
        "a": "not found in the text",
        "b": "yes",
        "name": "Terms restrict automated access"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "not found in the text",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "yes",
        "b": "not found in the text",
        "name": "Arbitration or class-action waiver"
      }
    ],
    "faq": [
      {
        "answer": "Claude Mythos 5.2 scores 77.3 (BB) on agent readiness against Gemini 4 Hydrogen's 64.9 (B), and leads in 6 of 7 scored categories. Gemini 4 Hydrogen leads on payments \u0026 pricing.",
        "question": "Which is better for AI agents, Claude Mythos 5.2 or Gemini 4 Hydrogen?"
      },
      {
        "answer": "Both need an API key.",
        "question": "Do Claude Mythos 5.2 and Gemini 4 Hydrogen need an API key?"
      },
      {
        "answer": "Yes. Claude Mythos 5.2 has a hosted endpoint at https://api.anthropic.com/v1 and Gemini 4 Hydrogen at https://generativelanguage.googleapis.com/v1beta.",
        "question": "Can an agent call Claude Mythos 5.2 and Gemini 4 Hydrogen without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Reliability, 60 against 45",
          "Schema \u0026 documentation, 90 against 85",
          "Agent ergonomics, 95 against 90",
          "Security \u0026 auth, 92 against 50",
          "Maintenance \u0026 community, 91 against 85",
          "Transparency \u0026 trust, 85 against 72"
        ],
        "also": [
          "Agent-ready, a grade of BB or better"
        ],
        "goodFor": "Security and life-science teams whose organisation Anthropic has verified, who want Fable 5.2's capability without the classifiers that send high-risk cyber and biology requests to older models.",
        "slug": "claude-mythos-5-2",
        "watchFor": "Only for organisations Anthropic verifies, so an agent can't start on it alone"
      },
      {
        "aheadOn": [
          "Payments \u0026 pricing, 40 against 30"
        ],
        "also": null,
        "goodFor": "Agents doing everyday coding, tool calls and document work at volume on the Gemini API, including ones that need to start on a free key, or as the executor beside Carbon or Argon.",
        "slug": "gemini-4-hydrogen",
        "watchFor": "temperature, top_p and top_k are ignored, and thinking_budget, MINIMAL, penalties and extra candidates return a 400"
      }
    ],
    "history": {
      "claude-mythos-5-2": [
        {
          "causes": [
            "method"
          ],
          "date": "2026-11-13",
          "delta": 1.2,
          "from": 76.1,
          "fromGrade": "BB",
          "to": 77.3,
          "toGrade": "BB"
        }
      ],
      "gemini-4-hydrogen": null
    },
    "job": {
      "capability": "inference.llm",
      "name": "LLM inference"
    },
    "others": [
      {
        "json": "https://www.anchorterminal.com/compare/amazon-bedrock-vs-claude-mythos-5-2.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/amazon-bedrock-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/amazon-bedrock-vs-gemini-4-hydrogen"
      },
      {
        "json": "https://www.anchorterminal.com/compare/anthropic-api-vs-claude-mythos-5-2.json",
        "title": "Claude API vs Claude Mythos 5.2",
        "url": "https://www.anchorterminal.com/compare/anthropic-api-vs-claude-mythos-5-2"
      },
      {
        "json": "https://www.anchorterminal.com/compare/anthropic-api-vs-gemini-4-hydrogen.json",
        "title": "Claude API vs Gemini 4 Hydrogen",
        "url": "https://www.anchorterminal.com/compare/anthropic-api-vs-gemini-4-hydrogen"
      },
      {
        "json": "https://www.anchorterminal.com/compare/antseed-vs-claude-mythos-5-2.json",
        "title": "Antseed vs Claude Mythos 5.2",
        "url": "https://www.anchorterminal.com/compare/antseed-vs-claude-mythos-5-2"
      },
      {
        "json": "https://www.anchorterminal.com/compare/antseed-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/antseed-vs-gemini-4-hydrogen"
      },
      {
        "json": "https://www.anchorterminal.com/compare/azure-openai-vs-claude-mythos-5-2.json",
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        "url": "https://www.anchorterminal.com/compare/azure-openai-vs-claude-mythos-5-2"
      },
      {
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        "url": "https://www.anchorterminal.com/compare/azure-openai-vs-gemini-4-hydrogen"
      },
      {
        "json": "https://www.anchorterminal.com/compare/blockrun-ai-vs-claude-mythos-5-2.json",
        "title": "BlockRun.AI vs Claude Mythos 5.2",
        "url": "https://www.anchorterminal.com/compare/blockrun-ai-vs-claude-mythos-5-2"
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      {
        "json": "https://www.anchorterminal.com/compare/blockrun-ai-vs-gemini-4-hydrogen.json",
        "title": "BlockRun.AI vs Gemini 4 Hydrogen",
        "url": "https://www.anchorterminal.com/compare/blockrun-ai-vs-gemini-4-hydrogen"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cerebras-inference-vs-claude-mythos-5-2.json",
        "title": "Cerebras Inference vs Claude Mythos 5.2",
        "url": "https://www.anchorterminal.com/compare/cerebras-inference-vs-claude-mythos-5-2"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cerebras-inference-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/cerebras-inference-vs-gemini-4-hydrogen"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-fable-5-2-vs-claude-mythos-5-2.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-fable-5-2-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/claude-fable-5-2-vs-gemini-4-hydrogen"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-cloudflare-ai-gateway.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-cloudflare-ai-gateway"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-cloudflare-workers-ai.json",
        "title": "Claude Mythos 5.2 vs Cloudflare Workers AI",
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        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-cohere-chat.json",
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-deepinfra.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-deepseek-api.json",
        "title": "Claude Mythos 5.2 vs DeepSeek API",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-deepseek-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-eden-ai.json",
        "title": "Claude Mythos 5.2 vs Eden AI",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-eden-ai"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-elorian-glimpse.json",
        "title": "Claude Mythos 5.2 vs Glimpse",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-elorian-glimpse"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-fireworks-inference.json",
        "title": "Claude Mythos 5.2 vs Fireworks AI Inference",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-fireworks-inference"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-4-carbon.json",
        "title": "Claude Mythos 5.2 vs Gemini 4 Carbon",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-4-carbon"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-api.json",
        "title": "Claude Mythos 5.2 vs Gemini Developer API",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-groq.json",
        "title": "Claude Mythos 5.2 vs GroqCloud",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-groq"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-hugging-face-inference-providers.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-hy4.json",
        "title": "Claude Mythos 5.2 vs Tencent Hy4",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-hy4"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-jais-3.json",
        "title": "Claude Mythos 5.2 vs Jais 3",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-jais-3"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-meta-model-api.json",
        "title": "Claude Mythos 5.2 vs Meta Model API",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-meta-model-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-minimax-api.json",
        "title": "Claude Mythos 5.2 vs MiniMax API",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-minimax-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-mistral-api.json",
        "title": "Claude Mythos 5.2 vs Mistral AI API",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-mistral-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-muse-ember.json",
        "title": "Claude Mythos 5.2 vs Muse Ember",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-muse-ember"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-muse-spark-open.json",
        "title": "Claude Mythos 5.2 vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-nemotron-3-5-super-vl.json",
        "title": "Claude Mythos 5.2 vs Nemotron 3.5 Super VL",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-nemotron-3-5-super-vl"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-novita-ai.json",
        "title": "Claude Mythos 5.2 vs Novita AI",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-novita-ai"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openai-api.json",
        "title": "Claude Mythos 5.2 vs OpenAI API",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openai-api"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openrouter.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openrouter"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-prism-inference.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-prism-inference"
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        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-ramp-router.json",
        "title": "Claude Mythos 5.2 vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-reflection-beam.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-reflection-beam"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-routerplus.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-routerplus"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-sambanova.json",
        "title": "Claude Mythos 5.2 vs SambaCloud",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-sambanova"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-siliconflow.json",
        "title": "Claude Mythos 5.2 vs SiliconFlow",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-siliconflow"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-simplismart.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-simplismart"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-stepfun-api.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-stepfun-api"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-swe-2-flash.json",
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        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-swe-2-flash"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-tencent-tokenhub.json",
        "title": "Claude Mythos 5.2 vs Tencent Cloud TokenHub",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-tencent-tokenhub"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-together-inference.json",
        "title": "Claude Mythos 5.2 vs Together AI Inference",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-together-inference"
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      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-vercel-ai-gateway.json",
        "title": "Claude Mythos 5.2 vs Vercel AI Gateway",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-vercel-ai-gateway"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-vertex-ai.json",
        "title": "Claude Mythos 5.2 vs Vertex AI (Gemini Enterprise Agent Platform)",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-vertex-ai"
      },
      {
        "json": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-xai-api.json",
        "title": "Claude Mythos 5.2 vs xAI API (Grok)",
        "url": "https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-xai-api"
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      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-gemini-4-hydrogen"
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      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-gemini-4-hydrogen"
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        "json": "https://www.anchorterminal.com/compare/cohere-chat-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/cohere-chat-vs-gemini-4-hydrogen"
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        "url": "https://www.anchorterminal.com/compare/deepinfra-vs-gemini-4-hydrogen"
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      {
        "json": "https://www.anchorterminal.com/compare/deepseek-api-vs-gemini-4-hydrogen.json",
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        "json": "https://www.anchorterminal.com/compare/eden-ai-vs-gemini-4-hydrogen.json",
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      {
        "json": "https://www.anchorterminal.com/compare/elorian-glimpse-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/elorian-glimpse-vs-gemini-4-hydrogen"
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        "json": "https://www.anchorterminal.com/compare/fireworks-inference-vs-gemini-4-hydrogen.json",
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        "url": "https://www.anchorterminal.com/compare/fireworks-inference-vs-gemini-4-hydrogen"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-carbon-vs-gemini-4-hydrogen.json",
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        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-gemini-api.json",
        "title": "Gemini 4 Hydrogen vs Gemini Developer API",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-gemini-api"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-groq.json",
        "title": "Gemini 4 Hydrogen vs GroqCloud",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-groq"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-hugging-face-inference-providers.json",
        "title": "Gemini 4 Hydrogen vs Hugging Face Inference Providers",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-hugging-face-inference-providers"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-hy4.json",
        "title": "Gemini 4 Hydrogen vs Tencent Hy4",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-hy4"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-jais-3.json",
        "title": "Gemini 4 Hydrogen vs Jais 3",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-jais-3"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-meta-model-api.json",
        "title": "Gemini 4 Hydrogen vs Meta Model API",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-meta-model-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-minimax-api.json",
        "title": "Gemini 4 Hydrogen vs MiniMax API",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-minimax-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-mistral-api.json",
        "title": "Gemini 4 Hydrogen vs Mistral AI API",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-mistral-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-muse-ember.json",
        "title": "Gemini 4 Hydrogen vs Muse Ember",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-muse-ember"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-muse-spark-open.json",
        "title": "Gemini 4 Hydrogen vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-muse-spark-open"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-nemotron-3-5-super-vl.json",
        "title": "Gemini 4 Hydrogen vs Nemotron 3.5 Super VL",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-nemotron-3-5-super-vl"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-novita-ai.json",
        "title": "Gemini 4 Hydrogen vs Novita AI",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-novita-ai"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-openai-api.json",
        "title": "Gemini 4 Hydrogen vs OpenAI API",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-openai-api"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-openrouter.json",
        "title": "Gemini 4 Hydrogen vs OpenRouter",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-openrouter"
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        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-prism-inference.json",
        "title": "Gemini 4 Hydrogen vs Prism Inference",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-prism-inference"
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        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-ramp-router.json",
        "title": "Gemini 4 Hydrogen vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-ramp-router"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-reflection-beam.json",
        "title": "Gemini 4 Hydrogen vs Beam 1.0",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-reflection-beam"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-routerplus.json",
        "title": "Gemini 4 Hydrogen vs RouterPlus",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-routerplus"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-sambanova.json",
        "title": "Gemini 4 Hydrogen vs SambaCloud",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-sambanova"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-siliconflow.json",
        "title": "Gemini 4 Hydrogen vs SiliconFlow",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-siliconflow"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-simplismart.json",
        "title": "Gemini 4 Hydrogen vs Simplismart",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-simplismart"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-stepfun-api.json",
        "title": "Gemini 4 Hydrogen vs StepFun API",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-stepfun-api"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-swe-2-flash.json",
        "title": "Gemini 4 Hydrogen vs SWE-2 Flash",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-swe-2-flash"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-tencent-tokenhub.json",
        "title": "Gemini 4 Hydrogen vs Tencent Cloud TokenHub",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-tencent-tokenhub"
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        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-together-inference.json",
        "title": "Gemini 4 Hydrogen vs Together AI Inference",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-together-inference"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-vercel-ai-gateway.json",
        "title": "Gemini 4 Hydrogen vs Vercel AI Gateway",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-vercel-ai-gateway"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-vertex-ai.json",
        "title": "Gemini 4 Hydrogen vs Vertex AI (Gemini Enterprise Agent Platform)",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-vertex-ai"
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      {
        "json": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-xai-api.json",
        "title": "Gemini 4 Hydrogen vs xAI API (Grok)",
        "url": "https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-xai-api"
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    ],
    "panel": null,
    "scores": [
      {
        "by": 15,
        "claude-mythos-5-2": 60,
        "edge": "claude-mythos-5-2",
        "gemini-4-hydrogen": 45,
        "key": "reliability",
        "name": "Reliability",
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 5,
        "claude-mythos-5-2": 90,
        "edge": "claude-mythos-5-2",
        "gemini-4-hydrogen": 85,
        "key": "schema",
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
      {
        "by": 5,
        "claude-mythos-5-2": 95,
        "edge": "claude-mythos-5-2",
        "gemini-4-hydrogen": 90,
        "key": "ergonomics",
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "by": 42,
        "claude-mythos-5-2": 92,
        "edge": "claude-mythos-5-2",
        "gemini-4-hydrogen": 50,
        "key": "security",
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "by": 10,
        "claude-mythos-5-2": 30,
        "edge": "gemini-4-hydrogen",
        "gemini-4-hydrogen": 40,
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 6,
        "claude-mythos-5-2": 91,
        "edge": "claude-mythos-5-2",
        "gemini-4-hydrogen": 85,
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "by": 13,
        "claude-mythos-5-2": 85,
        "edge": "claude-mythos-5-2",
        "gemini-4-hydrogen": 72,
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "Claude Mythos 5.2 scores 77.3 (BB) on agent readiness against Gemini 4 Hydrogen's 64.9 (B), and leads in 6 of 7 scored categories. Gemini 4 Hydrogen leads on payments \u0026 pricing. Both do llm inference.",
    "tasks": null,
    "tutorials": [],
    "verdicts": {
      "claude-mythos-5-2": "Fable 5.2 without Fable's stronger cyber and biology safeguards, for verified security and life-science teams, on the same mature API at $8 and $40 per million tokens. Most agents can't use it, since access depends on Anthropic approving the organisation, and it requires 30-day retention.",
      "gemini-4-hydrogen": "Google's fast Gemini 4 model, on every tier of the Gemini API including the free one, at $1.50 and $7.50 per million tokens with a 1M-token budget, four thinking levels, function calling and structured output. Sampling parameters are ignored, explicit caching isn't supported, it's a short-term release with 45 days' notice on Cloud, and the benchmarks are Google's."
    }
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  "markdown": "Claude Mythos 5.2 scores 77.3 (BB) on agent readiness against Gemini 4 Hydrogen's 64.9 (B), and leads in 6 of 7 scored categories. Gemini 4 Hydrogen leads on payments \u0026 pricing. Both do llm inference.\n\n- Claude Mythos 5.2: grade BB, 77.3/100, rank #70 of 1524. Markdown https://www.anchorterminal.com/tools/claude-mythos-5-2.md · JSON https://www.anchorterminal.com/api/v1/tools/claude-mythos-5-2.json\n- Gemini 4 Hydrogen: grade B, 64.9/100, rank #546 of 1524. Markdown https://www.anchorterminal.com/tools/gemini-4-hydrogen.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-4-hydrogen.json\n- Best model APIs and inference for AI agents: https://www.anchorterminal.com/best/inference/index.md\n- All 1044 models comparisons: https://www.anchorterminal.com/compare/inference/index.md\n\n## Which one, for what\n\n### Claude Mythos 5.2 (BB)\n\nGood for: Security and life-science teams whose organisation Anthropic has verified, who want Fable 5.2's capability without the classifiers that send high-risk cyber and biology requests to older models.\n\nAhead on:\n- Reliability, 60 against 45\n- Schema \u0026 documentation, 90 against 85\n- Agent ergonomics, 95 against 90\n- Security \u0026 auth, 92 against 50\n- Maintenance \u0026 community, 91 against 85\n- Transparency \u0026 trust, 85 against 72\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n\nWatch for: Only for organisations Anthropic verifies, so an agent can't start on it alone\n\n### Gemini 4 Hydrogen (B)\n\nGood for: Agents doing everyday coding, tool calls and document work at volume on the Gemini API, including ones that need to start on a free key, or as the executor beside Carbon or Argon.\n\nAhead on:\n- Payments \u0026 pricing, 40 against 30\n\nWatch for: temperature, top_p and top_k are ignored, and thinking_budget, MINIMAL, penalties and extra candidates return a 400\n\n\n## Why the edge\n\n### Security \u0026 auth: Claude Mythos 5.2 +42\n\n- Claude Mythos 5.2 (92): Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Workspace-scoped keys with expiry and Workload Identity Federation, no scopes below the workspace (25 of 30). No training on API data without express permission (20). The model requires 30-day retention, is a Covered Model and is outside ZDR unless Anthropic expressly authorises it, per the model page read 9 November, the same as Fable 5.1 (12 of 15). Usage and cost analytics, Compliance API and OpenTelemetry export (15). security.txt, HackerOne and SOC 2, ISO 27001 and ISO 42001 (20). Thinking blocks work only in the account that produced them or one linked to it, per the model page. 25 + 20 + 12 + 15 + 20 = 92.\n- Gemini 4 Hydrogen (50): Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Keys bound to a service account and restricted to the Gemini API, with no scopes and a token accepted in the URL (15 of 30, the platform's deduction). Hydrogen is on the free tier, where Google's terms say content is used to improve products and may be read by humans; paid-tier content isn't (10 of 20, the platform's reading; Carbon, paid tier only, got 15). Abuse retention has no number and new paid projects store requests by default since 26 October; Google's prompt-injection figure (2.3 times more resilient on Gray Swan's benchmark) is its own, and the model card says jailbreak resistance is still being improved (5 of 15). Request logs for billed projects (15). security.txt and a reward programme, no certification naming the API (5 of 20). 15 + 10 + 5 + 15 + 5 = 50.\n\n### Reliability: Claude Mythos 5.2 +15\n\n- Claude Mythos 5.2 (60): Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Status page at status.claude.com with component history (20). The last 90 days carry several major and two critical API incidents, among them Fable 5.1 and Mythos 5.1 on 3 September and Fable 5.1 on 23 and 25 October, so 0 for incident history. Rate limits published per model, Fable 5.x at 4,000 requests a minute at the Start tier (15). 429s with `retry-after` and SDK retries with backoff (15). No SLA on sale (0). The model page lists it as a current model with no preview label (10). 20 + 0 + 15 + 15 + 0 + 10 = 60. Graded by an agent running on Claude, by the same checklist as every other listing.\n- Gemini 4 Hydrogen (45): Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Status page at aistudio.google.com/status with no readable components or history (10 of 20) and no readable incident record (5 of 30). Rate-limit tiers and spend limits published, per-model limits in AI Studio (5 of 15). Backoff guidance for 429 and 503 and SDK retries (15). No SLA (0). Google Cloud's release notes and model page call Hydrogen generally available, a short-term release, under the same model ID; the Gemini API pages read don't name a stage, so full marks rest on Cloud's statement (10, a judgement call; Carbon, with no stage stated anywhere, got 5). 10 + 5 + 5 + 15 + 0 + 10 = 45.\n\n### Transparency \u0026 trust: Claude Mythos 5.2 +13\n\n- Claude Mythos 5.2 (85): Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Commercial Terms with named contracting parties and Apache 2.0 SDKs (15). Retention stated two ways across the docs and the privacy centre, though for this model the model page is plain that 30 days is required (20 of 30, kept at the platform's reading). Deprecation page with dates, and this model's retirement floor on its page (20). Processing countries and subprocessors named (20). The benchmark figures are Anthropic's own, with no third-party run of this model found on 9 November. 15 + 20 + 20 + 20 = 75.\n- Gemini 4 Hydrogen (72): Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Closed service with clear terms, SDKs Apache-2.0 (15). Free-tier content is used to improve products, paid-tier content isn't, abuse retention has no number, and request storage is on by default for new paid projects; the statements agree with each other (20 of 30). Deprecations table, and a stated 45-day minimum on Cloud (15 of 20). Data may be cached anywhere Google has facilities; no subprocessor list checked (5 of 20). A DeepMind model card gives a March 2026 knowledge cutoff, automated safety results and Frontier Safety Framework outcomes, with the full safety report marked coming soon. Every benchmark figure is Google's own. 15 + 20 + 15 + 5 = 55.\n\n### Payments \u0026 pricing: Gemini 4 Hydrogen +10\n\n- Claude Mythos 5.2 (30): Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. No machine payment protocol on the pricing page, read 9 November (0). Per-token prices published without a login, $8 and $40, the same as Fable 5.2 (20). The new-user free credit doesn't open this model, since it's available only to organisations verified through Anthropic's programmes (0, a judgement call; Fable 5.2 keeps the Claude API's 10). Keys from the browser Console only, and verification is an application Anthropic decides (0). 0 + 20 + 0 + 0 = 20. Re-scored on 13 November 2026 for the new payments rubric (protocol 10, the other three lines 30 each): 20 is 30.\n- Gemini 4 Hydrogen (40): Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. No machine payment protocol (0). Prices published in Google's announcement without a login, $1.50 input and $7.50 output per million tokens, flat across the window; the Gemini API pricing page, now at aistudio.google.com, is still to be read for Hydrogen's row (20). A free tier with no card: Google's announcement puts Hydrogen on all tiers of the Gemini API, and the free tier needs no billing account per the gemini-api listing; its limits for Hydrogen are on that pricing page (20). A Google account and AI Studio for a key (0). 0 + 20 + 20 + 0 = 40.\n\n### Maintenance \u0026 community: Claude Mythos 5.2 +6\n\n- Claude Mythos 5.2 (91): Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Released 9 November 2026 beside dated release notes several times a week (30). 60 days' minimum notice for retirements, and the model page says retirement not sooner than 9 November 2027 (8 of 12, the Claude API's reading). Model shutdowns kept to notice (8). Support centre and dated notes (15). The sampled SDK issue without a reply, per the 1 October check (5 of 10). Current SDKs (15). Runtimes stated (10). 30 + 8 + 8 + 15 + 5 + 15 + 10 = 91.\n- Gemini 4 Hydrogen (85): Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Released on 12 November 2026, recorded in Google Cloud's release notes; the Gemini API changelog, last updated 30 October, has no entry for it yet (30). Google Cloud states a minimum of 45 days' notice before Hydrogen is retired, short and stated for Cloud only; the Gemini API's deprecations give earliest dates with no stated minimum (6 of 12). Shutdowns in the last 90 days kept to their table (4 of 8). Dated changelog (15). SDK replies not sampled (5 of 10). Current SDKs; the developer guide names the minimum google-genai, @google/genai, Go and Java versions (15). Runtimes stated (10). 30 + 6 + 4 + 15 + 5 + 15 + 10 = 85.\n\n### Schema \u0026 documentation: Claude Mythos 5.2 +5\n\n- Claude Mythos 5.2 (90): Model reading for claude-mythos-5-2 on the Claude API. Platform facts are the Claude API listing's (anthropic-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. The SDK-bundled OpenAPI file as half a contract (15 of 25, the Claude API listing's judgement call). llms.txt with Markdown twins (10). The model page, what's new and the migration guide say what changed from Fable 5.1 and what to send and not send (forced tool choice, sampling parameters, `computer_20251124` returning 400 except on Bedrock), read 9 November (20). Structured outputs and strict tools GA (15). Documented error types with `request_id` (15). `anthropic-version` and dated release notes (15). 15 + 10 + 20 + 15 + 15 + 15 = 90.\n- Gemini 4 Hydrogen (85): Model reading for gemini-4-hydrogen on the Gemini API. Platform facts are the Gemini API listing's (gemini-api, re-read 1 November), carried over as RULES.md allows for a model on an already graded platform. Discovery document for GenerateContent (20 of 25). llms.txt with Markdown twins (10). The Cloud developer guide says what Hydrogen takes, every parameter that's ignored or returns 400, the thought-signature rules and how to migrate from Gemini 3.8 Flash, though it doesn't document forced calls (15 of 20). Structured output to a JSON Schema with some keywords not enforced (10 of 15). Examples and an errors page (15). Dated changelog and model versions (15). 20 + 10 + 15 + 10 + 15 + 15 = 85.\n\n## Score by category\n\n| Category | Weight | Claude Mythos 5.2 | Gemini 4 Hydrogen | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 60 | 45 | Claude Mythos 5.2 +15 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 90 | 85 | Claude Mythos 5.2 +5 |\n| Agent ergonomics | 13% (16.2 this run) | 95 | 90 | Claude Mythos 5.2 +5 |\n| Security \u0026 auth | 14% (17.5 this run) | 92 | 50 | Claude Mythos 5.2 +42 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 40 | Gemini 4 Hydrogen +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 91 | 85 | Claude Mythos 5.2 +6 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 85 | 72 | Claude Mythos 5.2 +13 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **77.3 · BB** | **64.9 · B** | |\n\n## Facts side by side\n\n| Fact | Claude Mythos 5.2 | Gemini 4 Hydrogen |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Anthropic | Google |\n| Hosted endpoint | `https://api.anthropic.com/v1` | `https://generativelanguage.googleapis.com/v1beta` |\n| Transports |  |  |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | Closed model, used through the Claude API and cloud platforms under Anthropic's Commercial Terms of Service | Closed model, used through the Gemini API and Google's apps under Google's terms |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-11-09 | 2026-11-12 |\n| Terms last updated | no date given | 2026-04-28 |\n| Privacy policy last updated | no date given | 2026-10-01 |\n| Customer content may train models | yes, with an opt-out | yes |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | yes | yes |\n| Terms or service can change without notice | not found in the text | not found in the text |\n| Arbitration or class-action waiver | yes | not found in the text |\n\n## How the scores have moved\n\n### Claude Mythos 5.2\n\n- +1.2 on 13 November 2026: checklist\n\n### Gemini 4 Hydrogen\n\nNo score change since it was listed.\n\n## Verdicts\n\n**Claude Mythos 5.2.** Fable 5.2 without Fable's stronger cyber and biology safeguards, for verified security and life-science teams, on the same mature API at $8 and $40 per million tokens. Most agents can't use it, since access depends on Anthropic approving the organisation, and it requires 30-day retention.\n\n**Gemini 4 Hydrogen.** Google's fast Gemini 4 model, on every tier of the Gemini API including the free one, at $1.50 and $7.50 per million tokens with a 1M-token budget, four thinking levels, function calling and structured output. Sampling parameters are ignored, explicit caching isn't supported, it's a short-term release with 45 days' notice on Cloud, and the benchmarks are Google's.\n\n## Before you call either\n\n### Claude Mythos 5.2\n\n1. Confirm your organisation is verified before routing work here; otherwise use claude-fable-5-2\n2. Call https://api.anthropic.com/v1/messages with model claude-mythos-5-2 and your key\n3. Steer thinking with the effort parameter (default high); don't send temperature, top_p or top_k\n4. Don't force a tool with tool_choice any or tool; describe the tool and let the model choose\n5. Thinking blocks from it are read only by Fable 5.2 and Mythos 5.2, so keep them out of other models' context\n6. Check data retention before sending regulated data, since 30 days is required\n\n### Gemini 4 Hydrogen\n\n1. Call generateContent at https://generativelanguage.googleapis.com/v1beta with model gemini-4-hydrogen and an x-goog-api-key\n2. Set thinking_level instead of thinking_budget; the default is HIGH, so set MEDIUM to keep 3.8 Flash's latency\n3. Don't send temperature, top_p, top_k, penalties or candidate_count above 1\n4. Pass every thought_signature back in its original part, on the first parallel functionCall only, or the call returns a 400\n5. Put static content of 4,096 tokens or more first so implicit caching applies, and keep confidential prompts off the free tier\n\n## Questions\n\n### Which is better for AI agents, Claude Mythos 5.2 or Gemini 4 Hydrogen?\n\nClaude Mythos 5.2 scores 77.3 (BB) on agent readiness against Gemini 4 Hydrogen's 64.9 (B), and leads in 6 of 7 scored categories. Gemini 4 Hydrogen leads on payments \u0026 pricing.\n\n### Do Claude Mythos 5.2 and Gemini 4 Hydrogen need an API key?\n\nBoth need an API key.\n\n### Can an agent call Claude Mythos 5.2 and Gemini 4 Hydrogen without installing anything?\n\nYes. Claude Mythos 5.2 has a hosted endpoint at https://api.anthropic.com/v1 and Gemini 4 Hydrogen at https://generativelanguage.googleapis.com/v1beta.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-4-hydrogen.json, and with the fewest tokens: https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-4-hydrogen.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"claude-mythos-5-2\", \"b\": \"gemini-4-hydrogen\"}`. From a terminal: `anchor compare claude-mythos-5-2 gemini-4-hydrogen`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/claude-mythos-5-2.json and https://www.anchorterminal.com/api/v1/tools/gemini-4-hydrogen.json\n\n## Other comparisons with Claude Mythos 5.2 or Gemini 4 Hydrogen\n\n- [Amazon Bedrock vs Claude Mythos 5.2](https://www.anchorterminal.com/compare/amazon-bedrock-vs-claude-mythos-5-2.md)\n- [Amazon Bedrock vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/amazon-bedrock-vs-gemini-4-hydrogen.md)\n- [Claude API vs Claude Mythos 5.2](https://www.anchorterminal.com/compare/anthropic-api-vs-claude-mythos-5-2.md)\n- [Claude API vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/anthropic-api-vs-gemini-4-hydrogen.md)\n- [Antseed vs Claude Mythos 5.2](https://www.anchorterminal.com/compare/antseed-vs-claude-mythos-5-2.md)\n- [Antseed vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/antseed-vs-gemini-4-hydrogen.md)\n- [Azure OpenAI in Foundry Models vs Claude Mythos 5.2](https://www.anchorterminal.com/compare/azure-openai-vs-claude-mythos-5-2.md)\n- [Azure OpenAI in Foundry Models vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/azure-openai-vs-gemini-4-hydrogen.md)\n- [BlockRun.AI vs Claude Mythos 5.2](https://www.anchorterminal.com/compare/blockrun-ai-vs-claude-mythos-5-2.md)\n- [BlockRun.AI vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/blockrun-ai-vs-gemini-4-hydrogen.md)\n- [Cerebras Inference vs Claude Mythos 5.2](https://www.anchorterminal.com/compare/cerebras-inference-vs-claude-mythos-5-2.md)\n- [Cerebras Inference vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/cerebras-inference-vs-gemini-4-hydrogen.md)\n- [Claude Fable 5.2 vs Claude Mythos 5.2](https://www.anchorterminal.com/compare/claude-fable-5-2-vs-claude-mythos-5-2.md)\n- [Claude Fable 5.2 vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/claude-fable-5-2-vs-gemini-4-hydrogen.md)\n- [Claude Mythos 5.2 vs Cloudflare AI Gateway](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-cloudflare-ai-gateway.md)\n- [Claude Mythos 5.2 vs Cloudflare Workers AI](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-cloudflare-workers-ai.md)\n- [Claude Mythos 5.2 vs Cohere Chat API (Command models)](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-cohere-chat.md)\n- [Claude Mythos 5.2 vs DeepInfra](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-deepinfra.md)\n- [Claude Mythos 5.2 vs DeepSeek API](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-deepseek-api.md)\n- [Claude Mythos 5.2 vs Eden AI](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-eden-ai.md)\n- [Claude Mythos 5.2 vs Glimpse](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-elorian-glimpse.md)\n- [Claude Mythos 5.2 vs Fireworks AI Inference](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-fireworks-inference.md)\n- [Claude Mythos 5.2 vs Gemini 4 Carbon](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-4-carbon.md)\n- [Claude Mythos 5.2 vs Gemini Developer API](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-gemini-api.md)\n- [Claude Mythos 5.2 vs GroqCloud](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-groq.md)\n- [Claude Mythos 5.2 vs Hugging Face Inference Providers](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-hugging-face-inference-providers.md)\n- [Claude Mythos 5.2 vs Tencent Hy4](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-hy4.md)\n- [Claude Mythos 5.2 vs Jais 3](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-jais-3.md)\n- [Claude Mythos 5.2 vs Meta Model API](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-meta-model-api.md)\n- [Claude Mythos 5.2 vs MiniMax API](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-minimax-api.md)\n- [Claude Mythos 5.2 vs Mistral AI API](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-mistral-api.md)\n- [Claude Mythos 5.2 vs Muse Ember](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-muse-ember.md)\n- [Claude Mythos 5.2 vs Muse Spark Open](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-muse-spark-open.md)\n- [Claude Mythos 5.2 vs Nemotron 3.5 Super VL](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-nemotron-3-5-super-vl.md)\n- [Claude Mythos 5.2 vs Novita AI](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-novita-ai.md)\n- [Claude Mythos 5.2 vs OpenAI API](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openai-api.md)\n- [Claude Mythos 5.2 vs OpenRouter](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openrouter.md)\n- [Claude Mythos 5.2 vs Prism Inference](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-prism-inference.md)\n- [Claude Mythos 5.2 vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-ramp-router.md)\n- [Claude Mythos 5.2 vs Beam 1.0](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-reflection-beam.md)\n- [Claude Mythos 5.2 vs RouterPlus](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-routerplus.md)\n- [Claude Mythos 5.2 vs SambaCloud](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-sambanova.md)\n- [Claude Mythos 5.2 vs SiliconFlow](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-siliconflow.md)\n- [Claude Mythos 5.2 vs Simplismart](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-simplismart.md)\n- [Claude Mythos 5.2 vs StepFun API](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-stepfun-api.md)\n- [Claude Mythos 5.2 vs SWE-2 Flash](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-swe-2-flash.md)\n- [Claude Mythos 5.2 vs Tencent Cloud TokenHub](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-tencent-tokenhub.md)\n- [Claude Mythos 5.2 vs Together AI Inference](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-together-inference.md)\n- [Claude Mythos 5.2 vs Vercel AI Gateway](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-vercel-ai-gateway.md)\n- [Claude Mythos 5.2 vs Vertex AI (Gemini Enterprise Agent Platform)](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-vertex-ai.md)\n- [Claude Mythos 5.2 vs xAI API (Grok)](https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-xai-api.md)\n- [Cloudflare AI Gateway vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-gemini-4-hydrogen.md)\n- [Cloudflare Workers AI vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-gemini-4-hydrogen.md)\n- [Cohere Chat API (Command models) vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/cohere-chat-vs-gemini-4-hydrogen.md)\n- [DeepInfra vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/deepinfra-vs-gemini-4-hydrogen.md)\n- [DeepSeek API vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/deepseek-api-vs-gemini-4-hydrogen.md)\n- [Eden AI vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/eden-ai-vs-gemini-4-hydrogen.md)\n- [Glimpse vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/elorian-glimpse-vs-gemini-4-hydrogen.md)\n- [Fireworks AI Inference vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/fireworks-inference-vs-gemini-4-hydrogen.md)\n- [Gemini 4 Carbon vs Gemini 4 Hydrogen](https://www.anchorterminal.com/compare/gemini-4-carbon-vs-gemini-4-hydrogen.md)\n- [Gemini 4 Hydrogen vs Gemini Developer API](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-gemini-api.md)\n- [Gemini 4 Hydrogen vs GroqCloud](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-groq.md)\n- [Gemini 4 Hydrogen vs Hugging Face Inference Providers](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-hugging-face-inference-providers.md)\n- [Gemini 4 Hydrogen vs Tencent Hy4](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-hy4.md)\n- [Gemini 4 Hydrogen vs Jais 3](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-jais-3.md)\n- [Gemini 4 Hydrogen vs Meta Model API](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-meta-model-api.md)\n- [Gemini 4 Hydrogen vs MiniMax API](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-minimax-api.md)\n- [Gemini 4 Hydrogen vs Mistral AI API](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-mistral-api.md)\n- [Gemini 4 Hydrogen vs Muse Ember](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-muse-ember.md)\n- [Gemini 4 Hydrogen vs Muse Spark Open](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-muse-spark-open.md)\n- [Gemini 4 Hydrogen vs Nemotron 3.5 Super VL](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-nemotron-3-5-super-vl.md)\n- [Gemini 4 Hydrogen vs Novita AI](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-novita-ai.md)\n- [Gemini 4 Hydrogen vs OpenAI API](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-openai-api.md)\n- [Gemini 4 Hydrogen vs OpenRouter](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-openrouter.md)\n- [Gemini 4 Hydrogen vs Prism Inference](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-prism-inference.md)\n- [Gemini 4 Hydrogen vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-ramp-router.md)\n- [Gemini 4 Hydrogen vs Beam 1.0](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-reflection-beam.md)\n- [Gemini 4 Hydrogen vs RouterPlus](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-routerplus.md)\n- [Gemini 4 Hydrogen vs SambaCloud](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-sambanova.md)\n- [Gemini 4 Hydrogen vs SiliconFlow](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-siliconflow.md)\n- [Gemini 4 Hydrogen vs Simplismart](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-simplismart.md)\n- [Gemini 4 Hydrogen vs StepFun API](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-stepfun-api.md)\n- [Gemini 4 Hydrogen vs SWE-2 Flash](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-swe-2-flash.md)\n- [Gemini 4 Hydrogen vs Tencent Cloud TokenHub](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-tencent-tokenhub.md)\n- [Gemini 4 Hydrogen vs Together AI Inference](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-together-inference.md)\n- [Gemini 4 Hydrogen vs Vercel AI Gateway](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-vercel-ai-gateway.md)\n- [Gemini 4 Hydrogen vs Vertex AI (Gemini Enterprise Agent Platform)](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-vertex-ai.md)\n- [Gemini 4 Hydrogen vs xAI API (Grok)](https://www.anchorterminal.com/compare/gemini-4-hydrogen-vs-xai-api.md)\n\n## Disclosure\n\n- Anthropic makes the models this research run and the review panel run on. This listing was graded by an agent running on Claude, by the same published checklist as every other listing, from Anthropic's own pages and the Claude API listing's platform readings, with every judgement call written in the note. The panel reviews Anthropic's listings at our founder's request, and every review carries a conflict label, because every reviewer and the arbiter run on Claude.\n",
  "meta": {
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