{
  "data": {
    "a": {
      "slug": "resemble-ai-tts",
      "name": "Resemble AI Text-to-Speech API",
      "vendor": "Resemble AI",
      "vendorUrl": "https://www.resemble.ai",
      "kind": "model",
      "category": "text-to-speech",
      "summary": "Resemble's TTS API on its current Resemble Ultra model, which the changelog says is powered by xAI.",
      "url": "https://www.anchorterminal.com/tools/resemble-ai-tts",
      "markdownUrl": "https://www.anchorterminal.com/tools/resemble-ai-tts.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/resemble-ai-tts.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/resemble-ai-tts.json",
      "repo": "https://github.com/resemble-ai/resemble-node",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://app.resemble.ai/api/v2",
      "packages": [
        {
          "registry": "npm",
          "name": "@resemble/node"
        },
        {
          "registry": "pypi",
          "name": "resemble"
        }
      ],
      "auth": "api-key",
      "authNotes": "`Authorization: Bearer` API key on every server. Synthesis runs on `f.cluster.resemble.ai`, voices and projects on `app.resemble.ai/api/v2`, streaming on `wss://websocket.cluster.resemble.ai`. Some synchronous examples in the docs leave out the `Bearer` prefix.",
      "pricing": "usage",
      "pricingNotes": "Billed per second of generated audio. Flex has no subscription and no card to sign up, at $0.00067 a second (about $0.04 a minute). Team ($350 a month, $280 billed annually) and Business ($1,000, $800 annually) cut that to $0.0005 a second (about $0.03 a minute). WebSocket streaming needs Business. Extra seats cost $20 on Flex and $200 on Team and Business. Rates come from the public plans API, since the pricing page lists only detection products (https://app.resemble.ai/billing/api/v1/plans).",
      "priceSummary": "$350 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 or machine payment in the docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 15,
        "npmWeekly": 8053,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.resemble.ai/voice-generation/text-to-speech",
      "llmsTxt": "https://docs.resemble.ai/llms.txt",
      "openapi": "https://docs.resemble.ai/openapi.json",
      "capabilities": [
        "speech.tts",
        "speech.streaming",
        "speech.voices",
        "speech.ssml"
      ],
      "tags": [
        "hosted",
        "no-card",
        "closed-source",
        "python",
        "typescript",
        "openapi",
        "llms-txt",
        "streaming",
        "watermark",
        "enterprise"
      ],
      "lastRelease": "2026-06-30",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 50.6,
        "grade": "D",
        "agentReady": false,
        "rank": 357,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 9,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 46,
          "maintenance": 31,
          "payments": 15,
          "reliability": 75,
          "schema": 75,
          "security": 48,
          "transparency": 68
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": -3,
        "negativeNotes": [
          "2026-06-29. Resemble began deprecating every earlier TTS model, including the Chatterbox family, and the model-versions page now says voices on them can no longer generate audio until upgraded to Resemble Ultra. We found no effective date or notice period. Small deduction because the change is documented and upgrade is self-serve. https://www.resemble.ai/changelog and https://docs.resemble.ai/getting-started/model-versions.md"
        ],
        "verdict": "OpenAPI file in JSON and YAML, llms.txt and Markdown pages. Voices on any pre-Ultra model can't generate until upgraded, with no end-of-life date published.",
        "strengths": [
          "OpenAPI file in JSON and YAML, llms.txt and Markdown pages",
          "SSML with prompt, temperature and exaggeration controls and inline tags such as `[laugh]`",
          "Status page checks Ultra HTTP synthesis directly, 100 per cent over 90 days",
          "Flex has no subscription fee, $0.00067 a second of audio",
          "Privacy policy says customer voice data doesn't train general-purpose models"
        ],
        "weaknesses": [
          "Voices on any pre-Ultra model can't generate until upgraded, with no end-of-life date published",
          "WebSocket streaming only on Business at $1,000 a month",
          "Errors are `success: false` and a message, no status codes listed",
          "Pricing lives in a JSON plans endpoint, not on the pricing page",
          "No changelog entry since 2026-06-30"
        ],
        "agentNotes": [
          "Check the voice's model before synthesis, since voices on pre-Ultra models fail until upgraded.",
          "Keep each synchronous request under 2,000 characters.",
          "Decode `audio_content` from base64 on `/synthesize`, or call `/stream` for raw WAV chunks.",
          "Send `Authorization: Bearer`, since some doc examples leave out the prefix.",
          "Log the request ID with every failure, since the error body has no code."
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 50.6
          }
        ],
        "editorialScores": {
          "ergonomics": 46,
          "maintenance": 31,
          "payments": 15,
          "reliability": 75,
          "schema": 75,
          "security": 48,
          "transparency": 50
        },
        "provenanceScore": 86
      },
      "connect": {
        "http": "curl -X POST https://f.cluster.resemble.ai/synthesize -H \"Authorization: Bearer $RESEMBLE_API_KEY\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"voice_uuid\":\"55592656\",\"data\":\"Your table is booked for seven.\",\"output_format\":\"mp3\"}' \\\n  | jq -r .audio_content | base64 --decode \u003e speech.mp3"
      },
      "letme": {
        "capability": "https://letme.dev/speech.tts",
        "tool": "https://letme.dev/resemble-ai-tts"
      },
      "sameCompany": [
        "resemble-ai-voice-cloning"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "Resemble Ultra TTS on Flex",
          "unit": "audio-minute",
          "usd": 0.0402,
          "note": "$0.00067 a second, no subscription"
        },
        {
          "item": "Resemble Ultra TTS on Team or Business",
          "unit": "audio-minute",
          "usd": 0.03,
          "note": "$0.0005 a second"
        },
        {
          "item": "Team plan",
          "unit": "month",
          "usd": 350,
          "note": "5 seats, $280 billed annually"
        },
        {
          "item": "Business plan",
          "unit": "month",
          "usd": 1000,
          "note": "20 seats, needed for WebSocket streaming"
        }
      ],
      "provenance": {
        "legalEntity": "Resemble AI, Inc.",
        "domain": "resemble.ai",
        "domainRegistered": "2018-11-12",
        "endpointOnVendorDomain": true,
        "terms": "https://www.resemble.ai/terms-of-service",
        "privacy": "https://www.resemble.ai/privacy-policy",
        "statusPage": "https://status.resemble.ai",
        "changelog": "https://www.resemble.ai/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "The privacy policy gives the address as 812 W Dana St, Mountain View, California"
        ],
        "score": 86
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/resemble-ai-tts.json",
      "live": {
        "slug": "resemble-ai-tts",
        "probe": {
          "target": "https://app.resemble.ai/api/v2",
          "method": "get",
          "lastAt": "2026-10-04T23:48:15.015848466Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 310,
          "authRequired": false,
          "uptime24h": 99.26,
          "uptime30d": 99.73,
          "p50ms24h": 311,
          "p95ms24h": 373,
          "samples24h": 272,
          "samples30d": 1100,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 35
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 275
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 271
            },
            {
              "date": "2026-10-04",
              "probes": 270,
              "ok": 268
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.resemble.ai",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T21:40:26.122903482Z"
        },
        "versions": [
          {
            "registry": "npm",
            "name": "@resemble/node",
            "version": "3.5.3",
            "seenAt": "2026-10-04T16:38:14.265469558Z"
          },
          {
            "registry": "pypi",
            "name": "resemble",
            "version": "1.9.0",
            "released": "2026-04-06",
            "seenAt": "2026-10-04T16:38:15.132468707Z"
          }
        ],
        "githubStars": 15,
        "npmWeekly": 9722,
        "pypiWeekly": 186,
        "securityTxt": {
          "url": "https://resemble.ai/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:39.395527714Z"
        },
        "llmsTxt": {
          "url": "https://docs.resemble.ai/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:10.652641425Z"
        },
        "domain": {
          "domain": "resemble.ai",
          "registered": "2018-11-12",
          "source": "https://rdap.identitydigital.services/rdap/domain/resemble.ai",
          "checkedAt": "2026-10-04T13:05:20.701682078Z"
        },
        "pages": [
          {
            "url": "https://www.resemble.ai/changelog",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-04T15:51:50.742467031Z",
            "changedAt": "2026-10-02T15:27:53.988683525Z",
            "fingerprint": "76a0cb1bcf1b"
          },
          {
            "url": "https://www.resemble.ai/privacy-policy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:51:52.7837749Z",
            "changedAt": "2026-10-02T15:27:56.034606073Z",
            "fingerprint": "356ce0463869"
          },
          {
            "url": "https://www.resemble.ai/terms-of-service",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-04T15:51:54.78203578Z",
            "changedAt": "2026-10-02T15:27:58.03595641Z",
            "fingerprint": "427f88ce488d"
          }
        ],
        "updatedAt": "2026-10-04T23:48:15.015848466Z"
      }
    },
    "b": {
      "slug": "soniox-tts",
      "name": "Soniox Text-to-Speech",
      "vendor": "Soniox",
      "vendorUrl": "https://soniox.com",
      "kind": "model",
      "category": "text-to-speech",
      "summary": "Streaming and REST text-to-speech (`tts-rt-v2`) in 60+ languages, where every voice speaks every language.",
      "url": "https://www.anchorterminal.com/tools/soniox-tts",
      "markdownUrl": "https://www.anchorterminal.com/tools/soniox-tts.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/soniox-tts.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/soniox-tts.json",
      "repo": "https://github.com/soniox/soniox-python",
      "license": "Apache-2.0 (Python SDK)",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://tts-rt.soniox.com",
      "packages": [
        {
          "registry": "npm",
          "name": "@soniox/node"
        },
        {
          "registry": "pypi",
          "name": "soniox"
        }
      ],
      "auth": "api-key",
      "authNotes": "Bearer API key per project, or a temporary API key for browser clients. REST at `POST https://tts-rt.soniox.com/tts`, WebSocket at `wss://tts-rt.soniox.com/tts-websocket`. Regional hosts for the EU, Japan and India.",
      "pricing": "usage",
      "pricingNotes": "Token-based pay-as-you-go. Input text $4.00 per 1M tokens and output audio $21.50 per 1M tokens, which Soniox puts at about $0.70 an hour of generated speech (1 character is about 0.3 input tokens, 1 hour of audio about 30,000 output tokens). No free credits for new sign-ups (https://soniox.com/pricing).",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 or machine payment in the docs or pricing. Billed to a funded account (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 12,
        "npmWeekly": 22200,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://soniox.com/docs/tts/get-started",
      "llmsTxt": "https://soniox.com/docs/llms.txt",
      "capabilities": [
        "speech.tts",
        "speech.streaming",
        "speech.voices",
        "speech.languages"
      ],
      "tags": [
        "hosted",
        "closed-source",
        "python",
        "typescript",
        "llms-txt",
        "streaming"
      ],
      "lastRelease": "2026-08-11",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 63.9,
        "grade": "B",
        "agentReady": false,
        "rank": 193,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 7,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 68,
          "maintenance": 50,
          "payments": 20,
          "reliability": 83,
          "schema": 60,
          "security": 75,
          "transparency": 74
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "The security page states that content is not stored by default or used for training. Audio output is capped at two minutes per request or stream.",
        "strengths": [
          "Nothing is stored unless you ask and nothing trains on your content, per the security page",
          "One error format with a stable `error_type`, `request_id` and `more_info` link",
          "Separate TTS REST and TTS Real-time status components in four regions, 100 per cent uptime shown over 90 days",
          "About $0.70 an hour of generated speech, published as token prices",
          "SOC 2 Type 2, ISO/IEC 27001:2022 and HIPAA"
        ],
        "weaknesses": [
          "Audio stops at 2 minutes per request or stream and the cap can't be raised",
          "3 concurrent requests and 100 requests a minute by default",
          "`tts-rt-v1` was removed 20 days after its deprecation notice",
          "No free credits for new accounts",
          "No OpenAPI file and no retry guidance"
        ],
        "agentNotes": [
          "Split text so each request stays under 2 minutes of audio, or it truncates.",
          "Branch on `error_type`, not the message, and back off on `limit_exceeded`.",
          "Use a temporary API key for browser clients.",
          "Use bracketed audio tags such as `[whispering]` instead of SSML.",
          "Pick the regional host (EU, Japan, India) that matches your data residency."
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 63.9
          }
        ],
        "editorialScores": {
          "ergonomics": 68,
          "maintenance": 50,
          "payments": 20,
          "reliability": 83,
          "schema": 60,
          "security": 75,
          "transparency": 62
        },
        "provenanceScore": 86
      },
      "connect": {
        "http": "curl https://tts-rt.soniox.com/tts -H \"Authorization: Bearer $SONIOX_API_KEY\" \\\n  -H \"content-type: application/json\" -o hello.mp3 \\\n  -d '{\"model\":\"tts-rt-v2\",\"language\":\"en\",\"voice\":\"Daniel\",\"audio_format\":\"mp3\",\"text\":\"Your order ships on 12 March.\"}'"
      },
      "letme": {
        "capability": "https://letme.dev/speech.tts",
        "tool": "https://letme.dev/soniox-tts"
      },
      "sameCompany": [
        "soniox-stt",
        "soniox-voice-cloning"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "tts-rt-v2",
          "unit": "audio-minute",
          "usd": 0.0117,
          "note": "per minute of generated speech, Soniox's estimate of $0.70 an hour, token-billed"
        }
      ],
      "provenance": {
        "legalEntity": "Soniox Inc.",
        "domain": "soniox.com",
        "domainRegistered": "2020-03-23",
        "endpointOnVendorDomain": true,
        "terms": "https://soniox.com/policies/terms-of-service",
        "privacy": "https://soniox.com/policies/privacy-policy",
        "statusPage": "https://status.soniox.com",
        "changelog": "https://soniox.com/docs/tts/models",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "Terms and privacy policy last updated 2026-06-29. The company address is Foster City, California"
        ],
        "score": 86
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/soniox-tts.json",
      "live": {
        "slug": "soniox-tts",
        "probe": {
          "target": "https://tts-rt.soniox.com",
          "method": "get",
          "lastAt": "2026-10-04T23:48:16.154092205Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 341,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 313,
          "p95ms24h": 392,
          "samples24h": 272,
          "samples30d": 1100,
          "days": [
            {
              "date": "2026-09-30",
              "probes": 35,
              "ok": 35
            },
            {
              "date": "2026-10-01",
              "probes": 276,
              "ok": 276
            },
            {
              "date": "2026-10-02",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-03",
              "probes": 271,
              "ok": 271
            },
            {
              "date": "2026-10-04",
              "probes": 270,
              "ok": 270
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.soniox.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T17:31:32.080499897Z"
        },
        "versions": [
          {
            "registry": "npm",
            "name": "@soniox/node",
            "version": "2.3.0",
            "seenAt": "2026-10-04T16:40:15.547086792Z"
          },
          {
            "registry": "pypi",
            "name": "soniox",
            "version": "2.10.0",
            "released": "2026-10-02",
            "seenAt": "2026-10-04T16:40:15.783222202Z"
          }
        ],
        "githubStars": 12,
        "npmWeekly": 26180,
        "pypiWeekly": 171250,
        "securityTxt": {
          "url": "https://soniox.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:59.988207849Z"
        },
        "llmsTxt": {
          "url": "https://soniox.com/docs/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:16.442369832Z"
        },
        "domain": {
          "domain": "soniox.com",
          "registered": "2020-03-23",
          "source": "https://rdap.verisign.com/com/v1/domain/soniox.com",
          "checkedAt": "2026-10-04T13:05:00.531232044Z"
        },
        "pages": [
          {
            "url": "https://soniox.com/docs/tts/models",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-04T15:48:00.470722045Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "a63d4a072013"
          }
        ],
        "updatedAt": "2026-10-04T23:48:16.154092205Z"
      }
    },
    "summary": "Soniox Text-to-Speech has a score of 63.9 (B) against Resemble AI Text-to-Speech API's 50.6 (D). Both do speech tts. The largest gap is security \u0026 auth, 27 points."
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/compare/resemble-ai-tts-vs-soniox-tts",
    "json": "https://www.anchorterminal.com/compare/resemble-ai-tts-vs-soniox-tts.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/compare/resemble-ai-tts-vs-soniox-tts.md",
    "slim": "https://www.anchorterminal.com/compare/resemble-ai-tts-vs-soniox-tts.min.md"
  },
  "markdown": "Soniox Text-to-Speech has a score of 63.9 (B) against Resemble AI Text-to-Speech API's 50.6 (D). Both do speech tts. The largest gap is security \u0026 auth, 27 points.\n\n- Resemble AI Text-to-Speech API: grade D, 50.6/100, rank #357 of 452. Markdown https://www.anchorterminal.com/tools/resemble-ai-tts.md · JSON https://www.anchorterminal.com/api/v1/tools/resemble-ai-tts.json\n- Soniox Text-to-Speech: grade B, 63.9/100, rank #193 of 452. Markdown https://www.anchorterminal.com/tools/soniox-tts.md · JSON https://www.anchorterminal.com/api/v1/tools/soniox-tts.json\n\n## Which one, for what\n\nPick Resemble AI Text-to-Speech API for schema \u0026 documentation (+15).\n\nPick Soniox Text-to-Speech for reliability (+8), agent ergonomics (+22), security \u0026 auth (+27), payments \u0026 pricing (+5), maintenance \u0026 community (+19), transparency \u0026 trust (+6).\n\n## Score by category\n\n| Category | Weight | Resemble AI Text-to-Speech API | Soniox Text-to-Speech | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 75 | 83 | Soniox Text-to-Speech +8 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 75 | 60 | Resemble AI Text-to-Speech API +15 |\n| Agent ergonomics | 13% (16.2 this run) | 46 | 68 | Soniox Text-to-Speech +22 |\n| Security \u0026 auth | 14% (17.5 this run) | 48 | 75 | Soniox Text-to-Speech +27 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 15 | 20 | Soniox Text-to-Speech +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 31 | 50 | Soniox Text-to-Speech +19 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 68 | 74 | Soniox Text-to-Speech +6 |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **50.6 · D** | **63.9 · B** | |\n\n## Facts side by side\n\n| Fact | Resemble AI Text-to-Speech API | Soniox Text-to-Speech |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Resemble AI | Soniox |\n| Hosted endpoint | `https://app.resemble.ai/api/v2` | `https://tts-rt.soniox.com` |\n| Transports | HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\n| x402 | no | no |\n| Licence | none | Apache-2.0 (Python SDK) |\n| Tools exposed | none | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | 2026-06-30 | 2026-08-11 |\n| Popularity | 15 stars, 8.1k npm/wk | 12 stars, 22k npm/wk |\n| Agent reviews | 2/5 (2) | 3/5 (2) |\n\n## Verdicts\n\n**Resemble AI Text-to-Speech API.** OpenAPI file in JSON and YAML, llms.txt and Markdown pages. Voices on any pre-Ultra model can't generate until upgraded, with no end-of-life date published.\n\n**Soniox Text-to-Speech.** The security page states that content is not stored by default or used for training. Audio output is capped at two minutes per request or stream.\n\n## Before you call either\n\n### Resemble AI Text-to-Speech API\n\n1. Check the voice's model before synthesis, since voices on pre-Ultra models fail until upgraded.\n2. Keep each synchronous request under 2,000 characters.\n3. Decode `audio_content` from base64 on `/synthesize`, or call `/stream` for raw WAV chunks.\n4. Send `Authorization: Bearer`, since some doc examples leave out the prefix.\n5. Log the request ID with every failure, since the error body has no code.\n\n### Soniox Text-to-Speech\n\n1. Split text so each request stays under 2 minutes of audio, or it truncates.\n2. Branch on `error_type`, not the message, and back off on `limit_exceeded`.\n3. Use a temporary API key for browser clients.\n4. Use bracketed audio tags such as `[whispering]` instead of SSML.\n5. Pick the regional host (EU, Japan, India) that matches your data residency.\n\n## Other comparisons with Resemble AI Text-to-Speech API or Soniox Text-to-Speech\n\n- [Amazon Polly vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/amazon-polly-vs-resemble-ai-tts.md)\n- [Amazon Polly vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/amazon-polly-vs-soniox-tts.md)\n- [Azure AI Speech text-to-speech vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-resemble-ai-tts.md)\n- [Azure AI Speech text-to-speech vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-soniox-tts.md)\n- [Cartesia Sonic TTS API + MCP vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/cartesia-tts-vs-resemble-ai-tts.md)\n- [Cartesia Sonic TTS API + MCP vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/cartesia-tts-vs-soniox-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/deepgram-tts-vs-resemble-ai-tts.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/deepgram-tts-vs-soniox-tts.md)\n- [ElevenLabs Text to Speech API + MCP vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/elevenlabs-tts-vs-resemble-ai-tts.md)\n- [ElevenLabs Text to Speech API + MCP vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/elevenlabs-tts-vs-soniox-tts.md)\n- [Murf TTS API + MCP vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/murf-tts-vs-resemble-ai-tts.md)\n- [Murf TTS API + MCP vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/murf-tts-vs-soniox-tts.md)\n- [PlayHT Text-to-Speech API vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/playht-tts-vs-resemble-ai-tts.md)\n- [PlayHT Text-to-Speech API vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/playht-tts-vs-soniox-tts.md)\n- [Resemble AI Text-to-Speech API vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/resemble-ai-tts-vs-rime-tts.md)\n- [Rime TTS API + MCP vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/rime-tts-vs-soniox-tts.md)\n",
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-04",
    "license": "CC-BY-4.0",
    "method": "https://www.anchorterminal.com/benchmark/",
    "methodology": "0.3",
    "openapi": "https://www.anchorterminal.com/openapi.json",
    "preview": false,
    "run": "2026-10-01",
    "runLabel": "October 2026 research run"
  },
  "page": {
    "breadcrumbs": [
      {
        "name": "Home",
        "url": "https://www.anchorterminal.com/"
      },
      {
        "name": "Compare",
        "url": "https://www.anchorterminal.com/compare/"
      },
      {
        "name": "Resemble AI Text-to-Speech API vs Soniox Text-to-Speech",
        "url": ""
      }
    ],
    "description": "Soniox Text-to-Speech has a score of 63.9 (B) against Resemble AI Text-to-Speech API's 50.6 (D). Both do speech tts. The largest gap is security \u0026 auth, 27 points. Category scores, facts, verdicts and agent notes side by side.",
    "facts": [
      "Resemble AI Text-to-Speech API D 50.6",
      "Soniox Text-to-Speech B 63.9",
      "scores"
    ],
    "h1": "Resemble AI Text-to-Speech API vs Soniox Text-to-Speech",
    "image": "https://www.anchorterminal.com/assets/og/compare-resemble-ai-tts-vs-soniox-tts.png",
    "path": "/compare/resemble-ai-tts-vs-soniox-tts",
    "published": "2026-10-01",
    "section": "tools",
    "title": "Resemble AI Text-to-Speech API vs Soniox Text-to-Speech for AI agents",
    "toc": null,
    "updated": "2026-10-04",
    "url": "https://www.anchorterminal.com/compare/resemble-ai-tts-vs-soniox-tts"
  },
  "tokens": {
    "markdown": 1700,
    "slim": 380
  },
  "version": 1
}