{
  "data": {
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      "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": {
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        "npmWeekly": 599958,
        "pypiWeekly": 738086,
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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": {
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          "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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          "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
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      "pageJsonUrl": "https://www.anchorterminal.com/tools/assemblyai-stt.json",
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              "date": "2026-10-02",
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          "domain": "assemblyai.com",
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            "url": "https://www.assemblyai.com/legal/terms-of-service",
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    },
    "b": {
      "slug": "speechmatics-stt",
      "name": "Speechmatics Speech-to-Text",
      "vendor": "Speechmatics",
      "vendorUrl": "https://www.speechmatics.com",
      "kind": "model",
      "category": "speech-to-text",
      "summary": "Speechmatics' APIs for batch and real-time transcription, including speaker-attributed turns for voice agents.",
      "url": "https://www.anchorterminal.com/tools/speechmatics-stt",
      "markdownUrl": "https://www.anchorterminal.com/tools/speechmatics-stt.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/speechmatics-stt.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/speechmatics-stt.json",
      "repo": "https://github.com/speechmatics/speechmatics-python-sdk",
      "license": "MIT (SDKs)",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://eu1.asr.api.speechmatics.com/v2",
      "packages": [
        {
          "registry": "npm",
          "name": "@speechmatics/batch-client"
        },
        {
          "registry": "npm",
          "name": "@speechmatics/real-time-client"
        },
        {
          "registry": "pypi",
          "name": "speechmatics-batch"
        },
        {
          "registry": "pypi",
          "name": "speechmatics-rt"
        }
      ],
      "auth": "api-key",
      "authNotes": "API key as a Bearer token. Short-lived JWTs for browser and realtime clients, passed as `?jwt=` on the WebSocket URL. A separate management token covers project and key administration.",
      "pricing": "usage",
      "pricingNotes": "$100 free credit with no card, then pay as you go per hour of audio, billed to the second. Batch Melia 1 $0.13, Batch Standard $0.24, Batch Enhanced $0.40, Realtime Standard $0.24, Realtime Enhanced $0.43, Linden 1 (Agent STT) $0.16 (was $0.21). Translation adds $0.65 an hour. 20 per cent off usage over 500 hours a month per model, and 33 per cent off if you opt in to model training (https://www.speechmatics.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,
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        "githubStars": 20,
        "npmWeekly": 58050,
        "pypiWeekly": 48085,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.speechmatics.com",
      "llmsTxt": "https://docs.speechmatics.com/llms.txt",
      "capabilities": [
        "speech.stt",
        "speech.streaming",
        "speech.batch",
        "speech.diarisation",
        "speech.languages",
        "speech.translation"
      ],
      "tags": [
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        "no-card",
        "closed-source",
        "python",
        "typescript",
        "llms-txt",
        "streaming",
        "batch",
        "webhooks",
        "async-jobs",
        "enterprise",
        "self-hosted"
      ],
      "lastRelease": "2026-09-22",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 67.3,
        "grade": "B",
        "agentReady": false,
        "rank": 145,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 7,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 80,
          "maintenance": 75,
          "payments": 40,
          "reliability": 70,
          "schema": 65,
          "security": 65,
          "transparency": 78
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Training is opt-in and real-time audio is not stored. Enhanced transcription costs $0.40 to $0.43 an hour.",
        "strengths": [
          "Training is opt-in only, and realtime audio isn't stored",
          "ISO/IEC 27001:2022 and SOC 2 Type II",
          "Transcripts fetched as plain text, JSON or SRT",
          "Ten dated changelog entries in September 2026",
          "$100 credit with no card"
        ],
        "weaknesses": [
          "Enhanced costs $0.40 to $0.43 an hour, above most rivals",
          "No OpenAPI or AsyncAPI file linked from the docs",
          "429s carry a reason but no Retry-After or backoff guidance",
          "Realtime JWTs travel in the WebSocket URL",
          "Free plan allows 2 realtime sessions"
        ],
        "agentNotes": [
          "Set `\"model\": \"enhanced\"` explicitly. The default is `standard`",
          "Use notifications instead of polling. Polling waits 5 seconds by default since the 23 September 2026 change, and `wait=0` turns that off",
          "Fetch batch transcripts within 7 days. After that the API returns 404 `expired`",
          "Pass a `fetch_data` URL for files over 1 GB",
          "Use `/v2/agent` with `linden-1` for live agents instead of the plain realtime path"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3.5,
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            "confidence": "medium",
            "grade": "B",
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            "pending": [
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              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 67.3
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        ],
        "editorialScores": {
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          "maintenance": 75,
          "payments": 40,
          "reliability": 70,
          "schema": 65,
          "security": 65,
          "transparency": 65
        },
        "provenanceScore": 90
      },
      "connect": {
        "http": "curl -X POST https://eu1.asr.api.speechmatics.com/v2/jobs/ -H \"Authorization: Bearer $SPEECHMATICS_API_KEY\" \\\n  -F data_file=@call.wav \\\n  -F config='{\"type\":\"transcription\",\"transcription_config\":{\"language\":\"en\",\"model\":\"enhanced\",\"diarization\":\"speaker\"}}'"
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      "letme": {
        "capability": "https://letme.dev/speech.stt",
        "tool": "https://letme.dev/speechmatics-stt"
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      "area": "voice",
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          "item": "Batch Melia 1",
          "unit": "audio-minute",
          "usd": 0.0022,
          "note": "published as $0.13 an hour"
        },
        {
          "item": "Batch Standard",
          "unit": "audio-minute",
          "usd": 0.004,
          "note": "published as $0.24 an hour"
        },
        {
          "item": "Batch Enhanced",
          "unit": "audio-minute",
          "usd": 0.0067,
          "note": "published as $0.40 an hour"
        },
        {
          "item": "Realtime Standard",
          "unit": "audio-minute",
          "usd": 0.004,
          "note": "published as $0.24 an hour"
        },
        {
          "item": "Realtime Enhanced",
          "unit": "audio-minute",
          "usd": 0.0072,
          "note": "published as $0.43 an hour"
        },
        {
          "item": "Linden 1 Agent STT",
          "unit": "audio-minute",
          "usd": 0.0027,
          "note": "published as $0.16 an hour, reduced from $0.21"
        },
        {
          "item": "Translation add-on",
          "unit": "audio-minute",
          "usd": 0.0108,
          "note": "published as $0.65 an hour"
        }
      ],
      "provenance": {
        "legalEntity": "Cantab Research Ltd",
        "domain": "speechmatics.com",
        "domainRegistered": "2006-05-10",
        "endpointOnVendorDomain": true,
        "terms": "https://www.speechmatics.com/legal/terms-of-service",
        "privacy": "https://www.speechmatics.com/legal/privacy-policy",
        "statusPage": "https://status.speechmatics.com",
        "changelog": "https://speechmatics.featurebase.app/en/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "notes": [
          "Trades as Speechmatics, company number 05697423 in England and Wales. US customers contract with Speechmatics (USA) Inc., a Delaware company"
        ],
        "score": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/speechmatics-stt.json",
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        "vendorStatus": {
          "page": "https://status.speechmatics.com",
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            "registry": "pypi",
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        "pypiWeekly": 12463,
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          "url": "https://speechmatics.com/.well-known/security.txt",
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  "markdown": "Speechmatics Speech-to-Text has a score of 67.3 (B) against AssemblyAI Speech-to-Text (Universal)'s 67 (B). Both do speech stt. The largest gap is schema \u0026 documentation, 30 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- Speechmatics Speech-to-Text: grade B, 67.3/100, rank #145 of 452. Markdown https://www.anchorterminal.com/tools/speechmatics-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/speechmatics-stt.json\n\n## Which one, for what\n\nPick AssemblyAI Speech-to-Text (Universal) for schema \u0026 documentation (+30), maintenance \u0026 community (+5).\n\nPick Speechmatics Speech-to-Text for security \u0026 auth (+15).\n\n## Score by category\n\n| Category | Weight | AssemblyAI Speech-to-Text (Universal) | Speechmatics Speech-to-Text | 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 | 65 | AssemblyAI Speech-to-Text (Universal) +30 |\n| Agent ergonomics | 13% (16.2 this run) | 80 | 80 | even |\n| Security \u0026 auth | 14% (17.5 this run) | 50 | 65 | Speechmatics Speech-to-Text +15 |\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 | 78 | even |\n| Negative events | ≤15 | -3 | 0 | |\n| **Total** | | **67 · B** | **67.3 · B** | |\n\n## Facts side by side\n\n| Fact | AssemblyAI Speech-to-Text (Universal) | Speechmatics Speech-to-Text |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | AssemblyAI | Speechmatics |\n| Hosted endpoint | `https://api.assemblyai.com/v2` | `https://eu1.asr.api.speechmatics.com/v2` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Pay per use | Pay per use |\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 | 2026-09-22 |\n| Popularity | 213 stars, 600k npm/wk, 738k PyPI/wk | 20 stars, 58k npm/wk, 48k 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**Speechmatics Speech-to-Text.** Training is opt-in and real-time audio is not stored. Enhanced transcription costs $0.40 to $0.43 an hour.\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### Speechmatics Speech-to-Text\n\n1. Set `\"model\": \"enhanced\"` explicitly. The default is `standard`\n2. Use notifications instead of polling. Polling waits 5 seconds by default since the 23 September 2026 change, and `wait=0` turns that off\n3. Fetch batch transcripts within 7 days. After that the API returns 404 `expired`\n4. Pass a `fetch_data` URL for files over 1 GB\n5. Use `/v2/agent` with `linden-1` for live agents instead of the plain realtime path\n\n## Other comparisons with AssemblyAI Speech-to-Text (Universal) or Speechmatics Speech-to-Text\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 Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/amazon-transcribe-vs-speechmatics-stt.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 ElevenLabs Scribe Speech to Text API](https://www.anchorterminal.com/compare/assemblyai-stt-vs-elevenlabs-scribe.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- [Azure AI Speech speech-to-text vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-speechmatics-stt.md)\n- [Deepgram Speech-to-Text (Nova-3, Flux) vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/deepgram-stt-vs-speechmatics-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- [Gladia Speech-to-Text API + MCP vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/gladia-stt-vs-speechmatics-stt.md)\n- [Google Cloud Speech-to-Text vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/google-speech-to-text-vs-speechmatics-stt.md)\n- [Rev AI Speech-to-Text API vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/rev-ai-stt-vs-speechmatics-stt.md)\n- [Soniox Speech-to-Text vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/soniox-stt-vs-speechmatics-stt.md)\n",
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