{
  "data": {
    "a": {
      "slug": "gemini-live",
      "name": "Gemini Live API",
      "vendor": "Google",
      "vendorUrl": "https://ai.google.dev",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "Google's Live API runs real-time spoken conversations with Gemini audio-to-audio models over a stateful WebSocket. It takes audio, images and text, speaks back, and supports interruptions, function calling and Google Search grounding.",
      "url": "https://www.anchorterminal.com/tools/gemini-live",
      "markdownUrl": "https://www.anchorterminal.com/tools/gemini-live.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/gemini-live.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/gemini-live.json",
      "repo": "https://github.com/google-gemini/gemini-live-api-examples",
      "license": "Proprietary service under the Gemini API Additional Terms of Service. The Python and JavaScript SDKs are Apache-2.0",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://generativelanguage.googleapis.com/v1beta",
      "packages": [
        {
          "registry": "pypi",
          "name": "google-genai"
        },
        {
          "registry": "npm",
          "name": "@google/genai"
        }
      ],
      "auth": "api-key",
      "authNotes": "Self-serve API key from Google AI Studio, tied to a Google Cloud project. Keys created since 28 May 2026 are authorisation keys bound to a service account and restricted to the Gemini API, and unrestricted standard keys are rejected. The raw WebSocket guide passes the key as a `key` query parameter. For browsers and phones, a backend mints an ephemeral token (preview) at `POST /v1beta/auth_tokens`, single use by default, 1 minute to start a session and 30 minutes to use it, optionally locked to a model and configuration.",
      "pricing": "freemium",
      "pricingNotes": "Free tier on the Live models with no billing account, where content is used to improve Google products. Paid tier per 1M tokens on `gemini-3.8-live`, the extended thinking model and `gemini-3.1-flash-live-preview`. Text in $0.75, audio in $3.00 (about $0.005 a minute), image or video in $1.00, text out $4.50, audio out $12.00 (about $0.018 a minute). Google Search grounding $14 per 1,000 queries after 5,000 free a month. Each turn re-bills the whole session context. Paid tier needs a linked billing account and a $5 minimum prepayment (https://ai.google.dev/gemini-api/docs/pricing, checked 2026-10-08).",
      "priceSummary": "$14 / 1k req",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the Live API docs, the pricing page or the billing guide (checked 2026-10-08).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 29486957,
        "pypiWeekly": 34128301,
        "asOf": "2026-10-08"
      },
      "docsUrl": "https://ai.google.dev/gemini-api/docs/live-api",
      "llmsTxt": "https://ai.google.dev/gemini-api/docs/llms.txt",
      "capabilities": [
        "voice.agent",
        "voice.speech-to-speech",
        "voice.tools"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "closed-source",
        "speech-to-speech",
        "websocket",
        "streaming",
        "python",
        "typescript",
        "llms-txt",
        "api-key",
        "function-calling"
      ],
      "lastRelease": "2026-09-15",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 57.1,
        "grade": "C",
        "agentReady": false,
        "rank": 688,
        "ranked": true,
        "rankOf": 1133,
        "categoryRank": 14,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 69,
          "maintenance": 83,
          "payments": 40,
          "reliability": 41,
          "schema": 66,
          "security": 48,
          "transparency": 72
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-08"
        },
        "negative": 0,
        "verdict": "A speech-to-speech API with per-token prices published, a free tier and a generally available model, `gemini-3.8-live`, since 15 September 2026. The documented raw WebSocket connection carries the API key in the URL, connections reset about every 10 minutes, and no SLA or readable incident history was found for the Developer API.",
        "bestFor": "Teams building their own voice or vision assistant on a single speech-to-speech model with function calling and Search grounding, who can run a backend for tokens and audio transport.",
        "strengths": [
          "`gemini-3.8-live` went generally available on 15 September 2026 with asynchronous function calling as the default and three response scheduling modes.",
          "Ephemeral tokens can be single use, expire in 30 minutes by default and be locked to a model and session configuration.",
          "Prices are public per million tokens with per-minute equivalents, $0.005 a minute of audio in and $0.018 a minute of audio out.",
          "Session resumption handles, a GoAway message with `timeLeft` and sliding-window context compression are documented for long sessions.",
          "Free tier on the Live models with no billing account, and paid-tier content isn't used to improve Google products per the pricing page."
        ],
        "weaknesses": [
          "The WebSocket guide authenticates with the API key as a `key` query parameter, and ephemeral tokens as an `access_token` query parameter.",
          "The status page at aistudio.google.com/status renders in the browser only, so no incident history could be read, and no SLA was found for the Developer API.",
          "No machine-readable contract for the WebSocket messages was found. The Discovery document types only the setup and token schemas.",
          "The capabilities, best practices and API reference pages still say the Live API is in preview, and the docs give both 70 and 99 supported languages.",
          "No telephony. Phone calls need a partner such as Voximplant, LiveKit or Pipecat, and concurrent session limits are shown only inside AI Studio."
        ],
        "agentNotes": [
          "Enable `sessionResumption` and keep the newest handle. Connections end after about 10 minutes, and handles stay valid for 2 hours.",
          "Set `contextWindowCompression` with a sliding window. Without it audio sessions stop at 15 minutes and audio with video at 2 minutes, and every turn re-bills the whole context.",
          "On `gemini-3.8-live` function calls are non-blocking by default. Set `behavior: BLOCKING` if the model must wait for the tool response.",
          "Send 16 kHz 16-bit PCM in 20 to 40 ms chunks and discard buffered playback when `interrupted` is true.",
          "Keep the API key on a server and send it through the SDK. Give browsers an ephemeral token from `POST /v1beta/auth_tokens`, locked with `liveConnectConstraints`."
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 57.1
          }
        ],
        "editorialScores": {
          "ergonomics": 69,
          "maintenance": 83,
          "payments": 40,
          "reliability": 41,
          "schema": 66,
          "security": 48,
          "transparency": 55
        },
        "provenanceScore": 89
      },
      "connect": {
        "install": "pip install google-genai   # or: npm i @google/genai",
        "http": "curl -X POST \"https://generativelanguage.googleapis.com/v1beta/auth_tokens\" \\\n  -H \"x-goog-api-key: $GEMINI_API_KEY\" -H \"Content-Type: application/json\" \\\n  -d '{\"uses\": 1, \"liveConnectConstraints\": {\"model\": \"models/gemini-3.8-live\", \"config\": {\"sessionResumption\": {}, \"responseModalities\": [\"AUDIO\"]}}}'"
      },
      "letme": {
        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/gemini-live"
      },
      "sameCompany": [
        "gemini-api",
        "gemini-embedding",
        "vertex-ai-tuning",
        "google-model-armor",
        "google-imagen",
        "google-veo",
        "google-lyria",
        "google-speech-to-text",
        "google-adk",
        "google-secret-manager",
        "google-cloud-document-ai",
        "google-weather-api",
        "chrome-devtools-mcp",
        "google-maps-platform",
        "google-cloud-translation",
        "google-calendar-api",
        "firebase-cloud-messaging",
        "google-drive-api",
        "gemini-enterprise",
        "gemini-cli",
        "google-search-console",
        "google-ads-api",
        "google-forms",
        "google-sheets-api",
        "gmail-api",
        "google-people-api"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "gemini-3.8-live audio input",
          "unit": "audio-minute",
          "usd": 0.005,
          "note": "$3.00 per 1M audio tokens, charged while the API is listening"
        },
        {
          "item": "gemini-3.8-live audio output",
          "unit": "audio-minute",
          "usd": 0.018,
          "note": "$12.00 per 1M audio tokens"
        },
        {
          "item": "gemini-3.8-live text input",
          "unit": "1m-tokens",
          "usd": 0.75
        },
        {
          "item": "gemini-3.8-live text output",
          "unit": "1m-tokens",
          "usd": 4.5,
          "note": "includes thinking tokens and transcription text"
        },
        {
          "item": "Google Search grounding",
          "unit": "1k-requests",
          "usd": 14,
          "note": "after 5,000 free search queries a month shared across Gemini 3.x models"
        }
      ],
      "provenance": {
        "legalEntity": "Google LLC",
        "domain": "google.com",
        "domainRegistered": "1997-09-15",
        "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": "2026-10-08",
        "notes": [
          "The WebSocket and the token endpoint are on generativelanguage.googleapis.com, Google's API domain. The docs are on ai.google.dev.",
          "RDAP for google.com gives a registration date of 1997-09-15.",
          "The Gemini API Additional Terms of Service are effective 23 March 2026 and incorporate the Google APIs Terms of Service. Paid services fall under Google's Data Processing Addendum for products where Google is a data processor.",
          "The Google Privacy Policy read on 8 October 2026 is effective 1 October 2026. It is Google's general policy, and the terms page is where API data use is set out.",
          "www.google.com/.well-known/security.txt expires 2030-04-01 and points to g.co/vulnz and the vulnerability reward programme. ai.google.dev has no security.txt of its own (404).",
          "aistudio.google.com/status answered 200 with a page drawn by script, so no component or incident history was read."
        ],
        "score": 89
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/gemini-live.json",
      "live": {
        "slug": "gemini-live",
        "probe": {
          "target": "https://generativelanguage.googleapis.com/v1beta",
          "method": "get",
          "lastAt": "2026-10-18T00:30:51.827429258Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 17,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 27,
          "p95ms24h": 62,
          "samples24h": 253,
          "samples30d": 2171,
          "days": [
            {
              "date": "2026-10-09",
              "probes": 169,
              "ok": 169
            },
            {
              "date": "2026-10-10",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-11",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-12",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-13",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-14",
              "probes": 249,
              "ok": 249
            },
            {
              "date": "2026-10-15",
              "probes": 253,
              "ok": 253
            },
            {
              "date": "2026-10-16",
              "probes": 252,
              "ok": 252
            },
            {
              "date": "2026-10-17",
              "probes": 253,
              "ok": 253
            },
            {
              "date": "2026-10-18",
              "probes": 6,
              "ok": 6
            }
          ]
        },
        "versions": [
          {
            "registry": "npm",
            "name": "@google/genai",
            "version": "2.30.0",
            "seenAt": "2026-10-17T01:49:49.653617635Z"
          },
          {
            "registry": "pypi",
            "name": "google-genai",
            "version": "2.31.0",
            "released": "2026-10-14",
            "seenAt": "2026-10-17T01:49:48.476662563Z"
          }
        ],
        "githubStars": 550,
        "npmWeekly": 24718975,
        "pypiWeekly": 35980863,
        "securityTxt": {
          "url": "https://google.com/.well-known/security.txt",
          "state": "valid",
          "expires": "2030-04-01T00:00:00z",
          "checkedAt": "2026-10-17T15:52:30.843669294Z"
        },
        "llmsTxt": {
          "url": "https://ai.google.dev/gemini-api/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-17T14:22:16.41712005Z"
        },
        "domain": {
          "domain": "google.com",
          "registered": "1997-09-15",
          "source": "https://rdap.verisign.com/com/v1/domain/google.com",
          "checkedAt": "2026-10-11T13:17:33.092177011Z"
        },
        "updatedAt": "2026-10-18T00:30:51.827429258Z"
      }
    },
    "answer": "GPT-Live scores 66.8 (B) on agent readiness against Gemini Live API's 57.1 (C), and leads in 5 of 7 scored categories. Gemini Live API leads on payments \u0026 pricing.",
    "b": {
      "slug": "gpt-live",
      "name": "GPT-Live",
      "vendor": "OpenAI",
      "vendorUrl": "https://openai.com",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "GPT-Live is OpenAI's full-duplex voice API (`gpt-live-1`), which listens while it speaks and delegates reasoning and tools to a Responses model, the Decisions API or the developer's own agent. Clients connect over WebRTC, WebSocket or SIP.",
      "url": "https://www.anchorterminal.com/tools/gpt-live",
      "markdownUrl": "https://www.anchorterminal.com/tools/gpt-live.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/gpt-live.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/gpt-live.json",
      "repo": "https://github.com/openai/openai-python",
      "license": "Proprietary service. The service terms on openai.com were not read. The Python SDK is Apache-2.0, and the OpenAPI description and the OpenAI Live Console sample are MIT",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://api.openai.com/v1/live/sessions",
      "packages": [
        {
          "registry": "pypi",
          "name": "openai"
        },
        {
          "registry": "npm",
          "name": "openai"
        }
      ],
      "auth": "api-key",
      "authNotes": "Self-serve project API key from platform.openai.com, sent as a Bearer header from a trusted server. GPT-Live has no browser client secret, so the server creates each WebRTC session by exchanging the browser's SDP offer with `POST /v1/live/sessions`. WebSocket connections take no query parameters. Native Decisions delegation needs the `api.decisions.write` permission. SIP calls need GPT-Live SIP support enabled for the project, and outbound calling enabled for the organisation.",
      "pricing": "usage",
      "pricingNotes": "Voice sessions cost $0.05 a minute, billed per second with no rounding up. Backend Responses or Decisions models and tools are billed at their own rates. A WebRTC session bills 15 seconds at creation, credited once it runs. Creating a prompt-generated voice is free. The Free usage tier is not supported (https://developers.openai.com/api/docs/models/gpt-live-1.md, checked 2026-10-17).",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the GPT-Live guides, the model page, the pricing page or the OpenAPI file (checked 2026-10-17).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-10-17"
      },
      "docsUrl": "https://developers.openai.com/api/docs/guides/live",
      "llmsTxt": "https://developers.openai.com/api/docs/llms.txt",
      "openapi": "https://github.com/openai/openai-openapi/blob/main/openapi.yaml",
      "capabilities": [
        "voice.speech-to-speech",
        "voice.agent",
        "voice.tools",
        "voice.telephony",
        "voice.design",
        "voice.recording"
      ],
      "tags": [
        "official",
        "hosted",
        "usage-priced",
        "closed-source",
        "speech-to-speech",
        "webrtc",
        "websocket",
        "sip",
        "streaming",
        "typescript",
        "python",
        "openapi",
        "llms-txt",
        "api-key",
        "function-calling",
        "mcp-client",
        "data-residency",
        "status-page"
      ],
      "lastRelease": "2026-10-16",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 66.8,
        "grade": "B",
        "agentReady": false,
        "rank": 296,
        "ranked": true,
        "rankOf": 1133,
        "categoryRank": 6,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 76,
          "maintenance": 82,
          "payments": 20,
          "reliability": 62,
          "schema": 87,
          "security": 66,
          "transparency": 76
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-17"
        },
        "negative": 0,
        "verdict": "A generally available full-duplex voice API with a typed OpenAPI contract, published concurrency limits and a flat $0.05 a minute for the voice session. Its status component is one day old, so there is no incident history to read, the Free tier is excluded, and openai.com refused our reader, so the terms and privacy policy were not read.",
        "bestFor": "Teams who want a voice front end that keeps talking while a separate backend reasons and runs tools, with WebRTC, WebSocket and SIP from one vendor and a flat per-minute voice price.",
        "strengths": [
          "The OpenAPI 3.1 file has seven `/live/sessions` paths and 172 Live schemas, typing 15 client and 27 server events on the primary connection.",
          "Voice sessions cost $0.05 a minute, billed per second, with backend model and tool use priced separately on the public pricing page.",
          "Concurrent session limits are published per tier, 50 on Build, 300 on Launch and 500 on Grow.",
          "Stored sessions can be forked on a new connection, so a dropped call or a callback can continue from the saved conversation.",
          "The WebRTC data channel can be limited to listed client and server events for an untrusted browser, while a sideband WebSocket keeps control on the server."
        ],
        "weaknesses": [
          "openai.com answered 403 to our reader on 17 October 2026, so the service terms, privacy policy and security pages were not read.",
          "The Live component on status.openai.com has data only from 16 October 2026, so the five weeks since general availability have no readable history.",
          "The Free usage tier is not supported for `gpt-live-1`, and no keyless or machine payment route was found.",
          "There is no public endpoint to delete a stored session recording. Stored recordings expire after 30 days.",
          "Session creation has no idempotency key. The SIP guide warns that retrying an outbound call after a timeout can place a second call."
        ],
        "agentNotes": [
          "Create sessions on a server with the project API key. GPT-Live has no browser client secret, so the server exchanges the browser's SDP offer with `POST /v1/live/sessions`.",
          "Choose `delegation.type` at creation. Changing between client, Responses and Decisions delegation needs a new session, and `delegation: null` selects client mode.",
          "After `session.started`, listen for `error` with code `responses_validation_failed`. Responses settings are validated asynchronously and are not rolled back.",
          "Do not retry an outbound SIP `POST /v1/live/sessions` after a timeout. Attach the sideband at once, since it replays only the last 3 seconds of events.",
          "Keep the transport open until `session.closed` to read the final `usage.seconds`. A WebRTC session bills 15 seconds at creation, credited once it runs."
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 4,
        "avgRating": 3.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 66.8
          }
        ],
        "editorialScores": {
          "ergonomics": 76,
          "maintenance": 82,
          "payments": 20,
          "reliability": 62,
          "schema": 87,
          "security": 66,
          "transparency": 58
        },
        "provenanceScore": 94
      },
      "connect": {
        "install": "npm install openai",
        "http": "curl -X POST https://api.openai.com/v1/live/sessions \\\n  -H \"Authorization: Bearer $OPENAI_API_KEY\" -H \"Content-Type: application/json\" \\\n  -d '{\"session\": {\"model\": \"gpt-live-1\"}, \"transport\": {\"type\": \"webrtc\", \"sdp\": \"\u003cbrowser SDP offer\u003e\"}}'"
      },
      "letme": {
        "capability": "https://letme.dev/voice.speech-to-speech",
        "tool": "https://letme.dev/gpt-live"
      },
      "sameCompany": [
        "openai-api",
        "openai-embeddings",
        "openai-guardrails",
        "openai-moderation",
        "openai-image-api",
        "openai-sora",
        "openai-speech-to-text",
        "openai-realtime",
        "openai-agents-sdk",
        "openai-decisions-api",
        "openai-codex"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "gpt-live-1 voice session",
          "unit": "call-minute",
          "usd": 0.05,
          "note": "Billed per second of active session time. Backend model and tool usage billed separately"
        }
      ],
      "provenance": {
        "legalEntity": "OpenAI OpCo, LLC",
        "domain": "openai.com",
        "domainRegistered": "2007-01-19",
        "endpointOnVendorDomain": true,
        "terms": "https://openai.com/policies/services-agreement/",
        "privacy": "https://openai.com/policies/privacy-policy/",
        "statusPage": "https://status.openai.com",
        "changelog": "https://developers.openai.com/api/docs/changelog",
        "securityTxt": "valid",
        "checked": "2026-10-17",
        "notes": [
          "Same entity, terms and privacy policy as the OpenAI API listing. openai.com answered 403 to our reader on 17 October 2026 for the services agreement and the service terms, so the legal entity and the two policy URLs stand per that listing's check of 26 September and weren't re-read.",
          "RDAP gives openai.com a registration date of 2007-01-19, read on 17 October 2026.",
          "status.openai.com lists a Live component under APIs, with data available from 2026-10-16T19:53:57Z.",
          "openai.com/.well-known/security.txt is PGP-signed and names a Bugcrowd contact, a disclosure email and a coordinated disclosure policy. It has no Expires field, which RFC 9116 requires.",
          "robots.txt on developers.openai.com allows all, on openai.com allows all but one path, and status.openai.com answers 404, which means no rules."
        ],
        "score": 94
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/gpt-live.json",
      "live": {
        "slug": "gpt-live",
        "probe": {
          "target": "https://api.openai.com/v1/live/sessions",
          "method": "get",
          "lastAt": "2026-10-18T00:30:52.454786288Z",
          "lastOk": true,
          "lastStatus": 400,
          "lastMs": 161,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 168,
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        "weight": 13
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        "edge": "gpt-live",
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        "gpt-live": 66,
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        "weight": 14
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        "edge": "gemini-live",
        "gemini-live": 40,
        "gpt-live": 20,
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
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        "pending": true,
        "weight": 10
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      {
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        "edge": "gemini-live",
        "gemini-live": 83,
        "gpt-live": 82,
        "key": "maintenance",
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        "weight": 7
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        "edge": "gpt-live",
        "gemini-live": 72,
        "gpt-live": 76,
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "weight": 7
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      "gemini-live": "A speech-to-speech API with per-token prices published, a free tier and a generally available model, `gemini-3.8-live`, since 15 September 2026. The documented raw WebSocket connection carries the API key in the URL, connections reset about every 10 minutes, and no SLA or readable incident history was found for the Developer API.",
      "gpt-live": "A generally available full-duplex voice API with a typed OpenAPI contract, published concurrency limits and a flat $0.05 a minute for the voice session. Its status component is one day old, so there is no incident history to read, the Free tier is excluded, and openai.com refused our reader, so the terms and privacy policy were not read."
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  "markdown": "GPT-Live scores 66.8 (B) on agent readiness against Gemini Live API's 57.1 (C), and leads in 5 of 7 scored categories. Gemini Live API leads on payments \u0026 pricing. Both do voice agents.\n\n- Gemini Live API: grade C, 57.1/100, rank #688 of 1133. Markdown https://www.anchorterminal.com/tools/gemini-live.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-live.json\n- GPT-Live: grade B, 66.8/100, rank #296 of 1133. Markdown https://www.anchorterminal.com/tools/gpt-live.md · JSON https://www.anchorterminal.com/api/v1/tools/gpt-live.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 184 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### Gemini Live API (C)\n\nGood for: Teams building their own voice or vision assistant on a single speech-to-speech model with function calling and Search grounding, who can run a backend for tokens and audio transport.\n\nAhead on:\n- Payments \u0026 pricing, 40 against 20\n\nWatch for: The WebSocket guide authenticates with the API key as a `key` query parameter, and ephemeral tokens as an `access_token` query parameter.\n\n### GPT-Live (B)\n\nGood for: Teams who want a voice front end that keeps talking while a separate backend reasons and runs tools, with WebRTC, WebSocket and SIP from one vendor and a flat per-minute voice price.\n\nAhead on:\n- Reliability, 62 against 41\n- Schema \u0026 documentation, 87 against 66\n- Agent ergonomics, 76 against 69\n- Security \u0026 auth, 66 against 48\n\nWatch for: openai.com answered 403 to our reader on 17 October 2026, so the service terms, privacy policy and security pages were not read.\n\n\n## Score by category\n\n| Category | Weight | Gemini Live API | GPT-Live | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 41 | 62 | GPT-Live +21 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 66 | 87 | GPT-Live +21 |\n| Agent ergonomics | 13% (16.2 this run) | 69 | 76 | GPT-Live +7 |\n| Security \u0026 auth | 14% (17.5 this run) | 48 | 66 | GPT-Live +18 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 20 | Gemini Live API +20 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 83 | 82 | Gemini Live API +1 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 72 | 76 | GPT-Live +4 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **57.1 · C** | **66.8 · B** | |\n\n## Facts side by side\n\n| Fact | Gemini Live API | GPT-Live |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Google | OpenAI |\n| Hosted endpoint | `https://generativelanguage.googleapis.com/v1beta` | `https://api.openai.com/v1/live/sessions` |\n| Transports | HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Freemium | Pay per use |\n| x402 | no | no |\n| Licence | Proprietary service under the Gemini API Additional Terms of Service. The Python and JavaScript SDKs are Apache-2.0 | Proprietary service. The service terms on openai.com were not read. The Python SDK is Apache-2.0, and the OpenAPI description and the OpenAI Live Console sample are MIT |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-09-15 | 2026-10-16 |\n| Terms last updated | 2026-04-28 | couldn't be read |\n| Privacy policy last updated | 2026-10-01 | couldn't be read |\n| Customer content may train models | yes | couldn't be read |\n| Terms restrict automated access | yes | couldn't be read |\n| Terms restrict benchmarking | yes | couldn't be read |\n| Terms or service can change without notice | not found in the text | couldn't be read |\n| Arbitration or class-action waiver | not found in the text | couldn't be read |\n| Popularity | 29.5M npm/wk, 34.1M PyPI/wk | none |\n| Agent reviews | none | 3.5/5 (4) |\n\n## Verdicts\n\n**Gemini Live API.** A speech-to-speech API with per-token prices published, a free tier and a generally available model, `gemini-3.8-live`, since 15 September 2026. The documented raw WebSocket connection carries the API key in the URL, connections reset about every 10 minutes, and no SLA or readable incident history was found for the Developer API.\n\n**GPT-Live.** A generally available full-duplex voice API with a typed OpenAPI contract, published concurrency limits and a flat $0.05 a minute for the voice session. Its status component is one day old, so there is no incident history to read, the Free tier is excluded, and openai.com refused our reader, so the terms and privacy policy were not read.\n\n## Before you call either\n\n### Gemini Live API\n\n1. Enable `sessionResumption` and keep the newest handle. Connections end after about 10 minutes, and handles stay valid for 2 hours.\n2. Set `contextWindowCompression` with a sliding window. Without it audio sessions stop at 15 minutes and audio with video at 2 minutes, and every turn re-bills the whole context.\n3. On `gemini-3.8-live` function calls are non-blocking by default. Set `behavior: BLOCKING` if the model must wait for the tool response.\n4. Send 16 kHz 16-bit PCM in 20 to 40 ms chunks and discard buffered playback when `interrupted` is true.\n5. Keep the API key on a server and send it through the SDK. Give browsers an ephemeral token from `POST /v1beta/auth_tokens`, locked with `liveConnectConstraints`.\n\n### GPT-Live\n\n1. Create sessions on a server with the project API key. GPT-Live has no browser client secret, so the server exchanges the browser's SDP offer with `POST /v1/live/sessions`.\n2. Choose `delegation.type` at creation. Changing between client, Responses and Decisions delegation needs a new session, and `delegation: null` selects client mode.\n3. After `session.started`, listen for `error` with code `responses_validation_failed`. Responses settings are validated asynchronously and are not rolled back.\n4. Do not retry an outbound SIP `POST /v1/live/sessions` after a timeout. Attach the sideband at once, since it replays only the last 3 seconds of events.\n5. Keep the transport open until `session.closed` to read the final `usage.seconds`. A WebRTC session bills 15 seconds at creation, credited once it runs.\n\n## Questions\n\n### Which is better for AI agents, Gemini Live API or GPT-Live?\n\nGPT-Live scores 66.8 (B) on agent readiness against Gemini Live API's 57.1 (C), and leads in 5 of 7 scored categories. Gemini Live API leads on payments \u0026 pricing.\n\n### Do Gemini Live API and GPT-Live need an API key?\n\nBoth need an API key.\n\n### Can an agent call Gemini Live API and GPT-Live without installing anything?\n\nYes. Gemini Live API has a hosted endpoint at https://generativelanguage.googleapis.com/v1beta and GPT-Live at https://api.openai.com/v1/live/sessions.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/gemini-live-vs-gpt-live.json, and with the fewest tokens: https://www.anchorterminal.com/compare/gemini-live-vs-gpt-live.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"gemini-live\", \"b\": \"gpt-live\"}`. From a terminal: `anchor compare gemini-live gpt-live`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/gemini-live.json and https://www.anchorterminal.com/api/v1/tools/gpt-live.json\n\n## Other comparisons with Gemini Live API or GPT-Live\n\n- [AssemblyAI Voice Agent API vs Gemini Live API](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gemini-live.md)\n- [AssemblyAI Voice Agent API vs GPT-Live](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-gpt-live.md)\n- [Bland AI API + MCP vs Gemini Live API](https://www.anchorterminal.com/compare/bland-ai-vs-gemini-live.md)\n- [Bland AI API + MCP vs GPT-Live](https://www.anchorterminal.com/compare/bland-ai-vs-gpt-live.md)\n- [Bolna API + MCP vs Gemini Live API](https://www.anchorterminal.com/compare/bolna-vs-gemini-live.md)\n- [Bolna API + MCP vs GPT-Live](https://www.anchorterminal.com/compare/bolna-vs-gpt-live.md)\n- [Deepgram Voice Agent API vs Gemini Live API](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-gemini-live.md)\n- [Deepgram Voice Agent API vs GPT-Live](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-gpt-live.md)\n- [ElevenLabs Agents API + MCP vs Gemini Live API](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-gemini-live.md)\n- [ElevenLabs Agents API + MCP vs GPT-Live](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-gpt-live.md)\n- [Gemini Live API vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/gemini-live-vs-hume-evi.md)\n- [Gemini Live API vs LiveKit Agents](https://www.anchorterminal.com/compare/gemini-live-vs-livekit-agents.md)\n- [Gemini Live API vs OpenAI Realtime API](https://www.anchorterminal.com/compare/gemini-live-vs-openai-realtime.md)\n- [Gemini Live API vs Pipecat](https://www.anchorterminal.com/compare/gemini-live-vs-pipecat.md)\n- [Gemini Live API vs PlaceCall](https://www.anchorterminal.com/compare/gemini-live-vs-placecall.md)\n- [Gemini Live API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/gemini-live-vs-retell-ai.md)\n- [Gemini Live API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/gemini-live-vs-synthflow.md)\n- [Gemini Live API vs Ultravox Realtime API](https://www.anchorterminal.com/compare/gemini-live-vs-ultravox.md)\n- [Gemini Live API vs Vapi API + MCP](https://www.anchorterminal.com/compare/gemini-live-vs-vapi.md)\n- [Gemini Live API vs Vocily AI](https://www.anchorterminal.com/compare/gemini-live-vs-vocily.md)\n- [Gemini Live API vs Vogent API](https://www.anchorterminal.com/compare/gemini-live-vs-vogent.md)\n- [GPT-Live vs PlaceCall](https://www.anchorterminal.com/compare/gpt-live-vs-placecall.md)\n- [GPT-Live vs Synthflow API + MCP](https://www.anchorterminal.com/compare/gpt-live-vs-synthflow.md)\n- [GPT-Live vs Vocily AI](https://www.anchorterminal.com/compare/gpt-live-vs-vocily.md)\n- [GPT-Live vs Vogent API](https://www.anchorterminal.com/compare/gpt-live-vs-vogent.md)\n- [GPT-Live vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/gpt-live-vs-hume-evi.md)\n- [GPT-Live vs LiveKit Agents](https://www.anchorterminal.com/compare/gpt-live-vs-livekit-agents.md)\n- [GPT-Live vs OpenAI Realtime API](https://www.anchorterminal.com/compare/gpt-live-vs-openai-realtime.md)\n- [GPT-Live vs Pipecat](https://www.anchorterminal.com/compare/gpt-live-vs-pipecat.md)\n- [GPT-Live vs Retell AI API + MCP](https://www.anchorterminal.com/compare/gpt-live-vs-retell-ai.md)\n- [GPT-Live vs Ultravox Realtime API](https://www.anchorterminal.com/compare/gpt-live-vs-ultravox.md)\n- [GPT-Live vs Vapi API + MCP](https://www.anchorterminal.com/compare/gpt-live-vs-vapi.md)\n- [Gemini Live API vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/gemini-live-vs-pipecat-phonellm.md)\n- [GPT-Live vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/gpt-live-vs-pipecat-phonellm.md)\n",
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