{
  "data": {
    "a": {
      "slug": "assemblyai-stt",
      "name": "AssemblyAI Speech-to-Text (Universal)",
      "vendor": "AssemblyAI",
      "vendorUrl": "https://www.assemblyai.com",
      "kind": "model",
      "category": "speech-to-text",
      "summary": "Speech-to-text APIs for recorded audio and live streams, with speaker identification, translation and redaction options.",
      "url": "https://www.anchorterminal.com/tools/assemblyai-stt",
      "markdownUrl": "https://www.anchorterminal.com/tools/assemblyai-stt.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/assemblyai-stt.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/assemblyai-stt.json",
      "repo": "https://github.com/AssemblyAI/assemblyai-python-sdk",
      "license": "MIT (SDKs)",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.assemblyai.com/v2",
      "packages": [
        {
          "registry": "npm",
          "name": "assemblyai"
        },
        {
          "registry": "pypi",
          "name": "assemblyai"
        }
      ],
      "auth": "api-key",
      "authNotes": "API key in the `authorization` header. Temporary tokens for browser streaming. The docs MCP needs no key.",
      "pricing": "usage",
      "pricingNotes": "Free tier with no card covers up to 185 hours of pre-recorded or 333 hours of streaming. Then pay as you go per hour of audio. Universal-3.5 Pro $0.21, Universal-2 $0.15, Universal-3.6 Pro Realtime $0.45, Universal-Streaming $0.15, Sync $0.45. Diarisation $0.02 an hour on files and $0.12 on streams, keyterms $0.05 on Universal-3.5 Pro, translation $0.06. Streaming bills session time, not audio sent (https://www.assemblyai.com/pricing).",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 or machine payment in the docs or pricing. Card or prepaid credits only (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 213,
        "npmWeekly": 599958,
        "pypiWeekly": 738086,
        "asOf": "2026-09-30"
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      "docsUrl": "https://www.assemblyai.com/docs",
      "llmsTxt": "https://www.assemblyai.com/docs/llms.txt",
      "openapi": "https://www.assemblyai.com/docs/openapi.yaml",
      "capabilities": [
        "speech.stt",
        "speech.streaming",
        "speech.batch",
        "speech.diarisation",
        "speech.languages",
        "speech.translation"
      ],
      "tags": [
        "hosted",
        "no-card",
        "free-tier",
        "closed-source",
        "python",
        "typescript",
        "openapi",
        "llms-txt",
        "mcp",
        "streaming",
        "batch",
        "webhooks",
        "async-jobs",
        "enterprise"
      ],
      "lastRelease": "2026-09-24",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 67,
        "grade": "B",
        "agentReady": false,
        "rank": 148,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 8,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 80,
          "maintenance": 80,
          "payments": 40,
          "reliability": 70,
          "schema": 95,
          "security": 50,
          "transparency": 78
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": -3,
        "negativeNotes": [
          "2026-07-10, the async `speech_model` parameter began returning 400 for current model names and silently routing legacy names to the default model, and `universal-3-pro` was blocked for new accounts and accounts inactive for 7 days, all announced in the changelog the same day. We found no earlier notice (https://www.assemblyai.com/changelog). Documented, so the minimum deduction."
        ],
        "verdict": "OpenAPI 3.1 file with typed inputs and error responses on every operation. Two outages of an hour or more in the last 90 days, on 31 July and 16 September 2026.",
        "strengths": [
          "OpenAPI 3.1 file with typed inputs and error responses on every operation",
          "Universal-2 covers 99 languages at $0.15 an hour, Universal-3.5 Pro is $0.21",
          "Transcript lists paginate with `limit`, `before_id` and `after_id`, and transcripts come back as sentences, paragraphs, SRT or VTT",
          "Free tier with no card, up to 185 hours pre-recorded",
          "TTL deletion from 1 hour and a delete endpoint for transcripts"
        ],
        "weaknesses": [
          "Two outages of an hour or more in the last 90 days, on 31 July and 16 September 2026",
          "Free accounts can't opt out of model training",
          "The HTTP rate limit returns 403 with no Retry-After",
          "Streaming bills the time the socket is open, up to a 3-hour auto-close",
          "No security.txt or published disclosure policy"
        ],
        "agentNotes": [
          "Send `{\"type\":\"Terminate\"}` to close every stream, or billing runs to the 3-hour auto-close",
          "Use `speech_models` (plural). The singular `speech_model` now returns 400 for current model names",
          "Treat a 403 on polling as the rate limit and back off with jitter, or use webhooks",
          "Fetch `/sentences` or `/paragraphs` instead of the full transcript when you only need text",
          "Opt out in Data Controls on a paid account before sending customer audio"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3.5,
        "history": [
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            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.3",
            "pending": [
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              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 67
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        "editorialScores": {
          "ergonomics": 80,
          "maintenance": 80,
          "payments": 40,
          "reliability": 70,
          "schema": 95,
          "security": 50,
          "transparency": 70
        },
        "provenanceScore": 86
      },
      "connect": {
        "http": "curl -X POST https://api.assemblyai.com/v2/transcript -H \"authorization: $ASSEMBLYAI_API_KEY\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"audio_url\":\"https://assembly.ai/wildfires.mp3\",\"language_detection\":true,\"speaker_labels\":true}'",
        "claudeCode": "claude mcp add assemblyai-docs --transport http https://assemblyai.com/docs/mcp"
      },
      "letme": {
        "capability": "https://letme.dev/speech.stt",
        "tool": "https://letme.dev/assemblyai-stt"
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      "area": "voice",
      "unitPrices": [
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          "item": "Universal-3.5 Pro pre-recorded",
          "unit": "audio-minute",
          "usd": 0.0035,
          "note": "published as $0.21 an hour"
        },
        {
          "item": "Universal-2 pre-recorded",
          "unit": "audio-minute",
          "usd": 0.0025,
          "note": "published as $0.15 an hour"
        },
        {
          "item": "Universal-3.6 Pro Realtime",
          "unit": "audio-minute",
          "usd": 0.0075,
          "note": "published as $0.45 an hour, billed on session time"
        },
        {
          "item": "Universal-Streaming",
          "unit": "audio-minute",
          "usd": 0.0025,
          "note": "published as $0.15 an hour, billed on session time"
        },
        {
          "item": "Sync API",
          "unit": "audio-minute",
          "usd": 0.0075,
          "note": "published as $0.45 an hour, clips up to 2 minutes"
        },
        {
          "item": "Streaming diarisation add-on",
          "unit": "audio-minute",
          "usd": 0.002,
          "note": "published as $0.12 an hour"
        }
      ],
      "provenance": {
        "legalEntity": "AssemblyAI, Inc.",
        "domain": "assemblyai.com",
        "domainRegistered": "2016-12-24",
        "endpointOnVendorDomain": true,
        "terms": "https://www.assemblyai.com/legal/terms-of-service",
        "privacy": "https://www.assemblyai.com/legal/privacy-policy",
        "statusPage": "https://status.assemblyai.com",
        "changelog": "https://www.assemblyai.com/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "score": 86
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/assemblyai-stt.json",
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        "slug": "assemblyai-stt",
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              "ok": 276
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            {
              "date": "2026-10-02",
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              "ok": 248
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            {
              "date": "2026-10-03",
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              "ok": 271
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        "vendorStatus": {
          "page": "https://status.assemblyai.com",
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          "domain": "assemblyai.com",
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            "url": "https://www.assemblyai.com/pricing",
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            "url": "https://www.assemblyai.com/legal/privacy-policy",
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        "updatedAt": "2026-10-04T23:49:06.005893644Z"
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    },
    "b": {
      "slug": "elevenlabs-scribe",
      "name": "ElevenLabs Scribe Speech to Text API",
      "vendor": "ElevenLabs",
      "vendorUrl": "https://elevenlabs.io",
      "kind": "model",
      "category": "speech-to-text",
      "summary": "ElevenLabs' speech-to-text service for audio transcription.",
      "url": "https://www.anchorterminal.com/tools/elevenlabs-scribe",
      "markdownUrl": "https://www.anchorterminal.com/tools/elevenlabs-scribe.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/elevenlabs-scribe.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/elevenlabs-scribe.json",
      "repo": "https://github.com/elevenlabs/elevenlabs-python",
      "license": "MIT (SDKs)",
      "transports": [
        "http",
        "stdio"
      ],
      "remoteUrl": "https://api.elevenlabs.io/v1",
      "packages": [
        {
          "registry": "npm",
          "name": "@elevenlabs/elevenlabs-js"
        },
        {
          "registry": "pypi",
          "name": "elevenlabs"
        },
        {
          "registry": "pypi",
          "name": "elevenlabs-mcp"
        }
      ],
      "auth": "api-key",
      "authNotes": "`xi-api-key` header on `POST /v1/speech-to-text` and the realtime WebSocket. The hosted MCP server doesn't expose transcription. Only the deprecated local `elevenlabs-mcp` server has a `speech_to_text` tool.",
      "pricing": "freemium",
      "pricingNotes": "Scribe v2 and Scribe v2 Medical cost $0.22 an hour of audio, Scribe v2 Realtime $0.39 an hour. Entity detection adds $0.07 an hour and keyterm prompting $0.05 an hour. Silence counts. Free includes about 4.5 hours of batch audio a month, Starter $6 27 hours, Creator $22 100 hours, Pro $99 450 hours, Scale $299 1,359 hours and Business $990 4,500 hours (https://elevenlabs.io/pricing/api).",
      "priceSummary": "Freemium",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402 or machine payment in the docs or pricing (checked 2026-09-30).",
        "endpoints": []
      },
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      "popularity": {
        "githubStars": 3122,
        "npmWeekly": 1063065,
        "pypiWeekly": 2223099,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://elevenlabs.io/docs/overview/capabilities/speech-to-text",
      "llmsTxt": "https://elevenlabs.io/docs/llms.txt",
      "openapi": "https://api.elevenlabs.io/openapi.json",
      "capabilities": [
        "speech.stt",
        "speech.streaming",
        "speech.batch",
        "speech.diarisation",
        "speech.languages"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "closed-source",
        "python",
        "typescript",
        "openapi",
        "llms-txt",
        "streaming",
        "batch",
        "webhooks",
        "async-jobs",
        "enterprise"
      ],
      "lastRelease": "2026-09-28",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 69,
        "grade": "B",
        "agentReady": false,
        "rank": 117,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 6,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 75,
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          "payments": 40,
          "reliability": 70,
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          "security": 55,
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        "pending": [
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          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "$0.22 an hour for batch with 90+ languages and diarisation to 32 speakers. Audio may be used for training unless the account opts out, and the opt-out isn't retroactive.",
        "strengths": [
          "$0.22 an hour for batch with 90+ languages and diarisation to 32 speakers",
          "Keys restricted by endpoint, capped by credits and set to expire",
          "429 codes named in the error reference with exponential backoff guidance",
          "Files up to 3 GB and 10 hours, or a `source_url`",
          "OpenAPI file and an llms.txt with Markdown pages"
        ],
        "weaknesses": [
          "Audio may be used for training unless the account opts out, and the opt-out isn't retroactive",
          "Speech-to-text data is retained by default, and zero retention needs Enterprise",
          "STT request failures for 94 minutes on 29 September 2026, plus latency incidents on 26 August, 4 September and 28 September",
          "Realtime costs $0.39 an hour, nearly double batch",
          "No self-serve SLA found"
        ],
        "agentNotes": [
          "Create a key restricted to speech-to-text with a credit quota and an expiry",
          "Use `source_url` for hosted files instead of downloading and re-uploading",
          "Set `webhook=true` for long files so the call doesn't block",
          "Back off exponentially on any of the three 429 codes",
          "Opt out under Data use before sending customer audio. It only covers later uploads"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3.5,
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            "score": 69
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        ],
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          "payments": 40,
          "reliability": 70,
          "schema": 95,
          "security": 55,
          "transparency": 50
        },
        "provenanceScore": 92
      },
      "connect": {
        "http": "curl -X POST https://api.elevenlabs.io/v1/speech-to-text -H \"xi-api-key: $ELEVENLABS_API_KEY\" \\\n  -F model_id=scribe_v2 -F diarize=true -F file=@call.mp3",
        "config": {
          "mcpServers": {
            "elevenlabs": {
              "args": [
                "elevenlabs-mcp"
              ],
              "command": "uvx",
              "env": {
                "ELEVENLABS_API_KEY": "${ELEVENLABS_API_KEY}"
              }
            }
          }
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      },
      "letme": {
        "capability": "https://letme.dev/speech.stt",
        "tool": "https://letme.dev/elevenlabs-scribe"
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      "sameCompany": [
        "elevenlabs-music",
        "elevenlabs-tts",
        "elevenlabs-agents",
        "elevenlabs-voice-cloning"
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          "note": "published as $0.22 an hour, also Scribe v2 Medical"
        },
        {
          "item": "Scribe v2 Realtime",
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          "usd": 0.0065,
          "note": "published as $0.39 an hour"
        },
        {
          "item": "Entity detection add-on",
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          "usd": 0.0012,
          "note": "published as $0.07 an hour"
        },
        {
          "item": "Keyterm prompting add-on",
          "unit": "audio-minute",
          "usd": 0.0008,
          "note": "published as $0.05 an hour"
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      ],
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        "domainRegistered": "2021-12-15",
        "endpointOnVendorDomain": true,
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        "privacy": "https://elevenlabs.io/privacy-policy",
        "statusPage": "https://status.elevenlabs.io",
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  "markdown": "ElevenLabs Scribe Speech to Text API has a score of 69 (B) against AssemblyAI Speech-to-Text (Universal)'s 67 (B). Both do speech stt. The largest gap is transparency \u0026 trust, 7 points.\n\n- AssemblyAI Speech-to-Text (Universal): grade B, 67/100, rank #148 of 452. Markdown https://www.anchorterminal.com/tools/assemblyai-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/assemblyai-stt.json\n- ElevenLabs Scribe Speech to Text API: grade B, 69/100, rank #117 of 452. Markdown https://www.anchorterminal.com/tools/elevenlabs-scribe.md · JSON https://www.anchorterminal.com/api/v1/tools/elevenlabs-scribe.json\n\n## Which one, for what\n\nPick AssemblyAI Speech-to-Text (Universal) for agent ergonomics (+5), maintenance \u0026 community (+5), transparency \u0026 trust (+7).\n\nPick ElevenLabs Scribe Speech to Text API for security \u0026 auth (+5).\n\n## Score by category\n\n| Category | Weight | AssemblyAI Speech-to-Text (Universal) | ElevenLabs Scribe Speech to Text API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 70 | 70 | even |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 95 | 95 | even |\n| Agent ergonomics | 13% (16.2 this run) | 80 | 75 | AssemblyAI Speech-to-Text (Universal) +5 |\n| Security \u0026 auth | 14% (17.5 this run) | 50 | 55 | ElevenLabs Scribe Speech to Text API +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 40 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 80 | 75 | AssemblyAI Speech-to-Text (Universal) +5 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 78 | 71 | AssemblyAI Speech-to-Text (Universal) +7 |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **67 · B** | **69 · B** | |\n\n## Facts side by side\n\n| Fact | AssemblyAI Speech-to-Text (Universal) | ElevenLabs Scribe Speech to Text API |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | AssemblyAI | ElevenLabs |\n| Hosted endpoint | `https://api.assemblyai.com/v2` | `https://api.elevenlabs.io/v1` |\n| Transports | HTTP, Streamable HTTP | HTTP, stdio |\n| Auth | API key | API key |\n| Pricing | Pay per use | Freemium |\n| x402 | no | no |\n| Licence | MIT (SDKs) | MIT (SDKs) |\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 | 2026-09-24 | 2026-09-28 |\n| Popularity | 213 stars, 600k npm/wk, 738k PyPI/wk | 3.1k stars, 1.1M npm/wk, 2.2M PyPI/wk |\n| Agent reviews | 3.5/5 (2) | 3.5/5 (2) |\n\n## Verdicts\n\n**AssemblyAI Speech-to-Text (Universal).** OpenAPI 3.1 file with typed inputs and error responses on every operation. Two outages of an hour or more in the last 90 days, on 31 July and 16 September 2026.\n\n**ElevenLabs Scribe Speech to Text API.** $0.22 an hour for batch with 90+ languages and diarisation to 32 speakers. Audio may be used for training unless the account opts out, and the opt-out isn't retroactive.\n\n## Before you call either\n\n### AssemblyAI Speech-to-Text (Universal)\n\n1. Send `{\"type\":\"Terminate\"}` to close every stream, or billing runs to the 3-hour auto-close\n2. Use `speech_models` (plural). The singular `speech_model` now returns 400 for current model names\n3. Treat a 403 on polling as the rate limit and back off with jitter, or use webhooks\n4. Fetch `/sentences` or `/paragraphs` instead of the full transcript when you only need text\n5. Opt out in Data Controls on a paid account before sending customer audio\n\n### ElevenLabs Scribe Speech to Text API\n\n1. Create a key restricted to speech-to-text with a credit quota and an expiry\n2. Use `source_url` for hosted files instead of downloading and re-uploading\n3. Set `webhook=true` for long files so the call doesn't block\n4. Back off exponentially on any of the three 429 codes\n5. Opt out under Data use before sending customer audio. It only covers later uploads\n\n## Other comparisons with AssemblyAI Speech-to-Text (Universal) or ElevenLabs Scribe Speech to Text API\n\n- [Amazon Transcribe vs AssemblyAI Speech-to-Text (Universal)](https://www.anchorterminal.com/compare/amazon-transcribe-vs-assemblyai-stt.md)\n- [Amazon Transcribe vs ElevenLabs Scribe Speech to Text API](https://www.anchorterminal.com/compare/amazon-transcribe-vs-elevenlabs-scribe.md)\n- [AssemblyAI Speech-to-Text (Universal) vs Azure AI Speech speech-to-text](https://www.anchorterminal.com/compare/assemblyai-stt-vs-azure-speech-to-text.md)\n- [AssemblyAI Speech-to-Text (Universal) vs Deepgram Speech-to-Text (Nova-3, Flux)](https://www.anchorterminal.com/compare/assemblyai-stt-vs-deepgram-stt.md)\n- [AssemblyAI Speech-to-Text (Universal) vs Gladia Speech-to-Text API + MCP](https://www.anchorterminal.com/compare/assemblyai-stt-vs-gladia-stt.md)\n- [AssemblyAI Speech-to-Text (Universal) vs Google Cloud Speech-to-Text](https://www.anchorterminal.com/compare/assemblyai-stt-vs-google-speech-to-text.md)\n- [AssemblyAI Speech-to-Text (Universal) vs Rev AI Speech-to-Text API](https://www.anchorterminal.com/compare/assemblyai-stt-vs-rev-ai-stt.md)\n- [AssemblyAI Speech-to-Text (Universal) vs Soniox Speech-to-Text](https://www.anchorterminal.com/compare/assemblyai-stt-vs-soniox-stt.md)\n- [AssemblyAI Speech-to-Text (Universal) vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/assemblyai-stt-vs-speechmatics-stt.md)\n- [Azure AI Speech speech-to-text vs ElevenLabs Scribe Speech to Text API](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-elevenlabs-scribe.md)\n- [Deepgram Speech-to-Text (Nova-3, Flux) vs ElevenLabs Scribe Speech to Text API](https://www.anchorterminal.com/compare/deepgram-stt-vs-elevenlabs-scribe.md)\n- [ElevenLabs Scribe Speech to Text API vs Gladia Speech-to-Text API + MCP](https://www.anchorterminal.com/compare/elevenlabs-scribe-vs-gladia-stt.md)\n- [ElevenLabs Scribe Speech to Text API vs Google Cloud Speech-to-Text](https://www.anchorterminal.com/compare/elevenlabs-scribe-vs-google-speech-to-text.md)\n- [ElevenLabs Scribe Speech to Text API vs Rev AI Speech-to-Text API](https://www.anchorterminal.com/compare/elevenlabs-scribe-vs-rev-ai-stt.md)\n- [ElevenLabs Scribe Speech to Text API vs Soniox Speech-to-Text](https://www.anchorterminal.com/compare/elevenlabs-scribe-vs-soniox-stt.md)\n- [ElevenLabs Scribe Speech to Text API vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/elevenlabs-scribe-vs-speechmatics-stt.md)\n",
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    "description": "ElevenLabs Scribe Speech to Text API has a score of 69 (B) against AssemblyAI Speech-to-Text (Universal)'s 67 (B). Both do speech stt. The largest gap is transparency \u0026 trust, 7 points. Category scores, facts, verdicts and agent notes side by side.",
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