{
  "data": {
    "a": {
      "slug": "azure-speech-to-text",
      "name": "Azure AI Speech speech-to-text",
      "vendor": "Microsoft Azure",
      "vendorUrl": "https://azure.microsoft.com/en-us/products/ai-services/speech-to-text",
      "kind": "model",
      "category": "speech-to-text",
      "summary": "Azure's speech-to-text service for transcribing audio.",
      "url": "https://www.anchorterminal.com/tools/azure-speech-to-text",
      "markdownUrl": "https://www.anchorterminal.com/tools/azure-speech-to-text.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/azure-speech-to-text.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/azure-speech-to-text.json",
      "repo": "https://github.com/Azure-Samples/cognitive-services-speech-sdk",
      "license": "MIT (samples), SDK under Microsoft's own licence",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://eastus.api.cognitive.microsoft.com/speechtotext",
      "packages": [
        {
          "registry": "pypi",
          "name": "azure-cognitiveservices-speech"
        },
        {
          "registry": "npm",
          "name": "microsoft-cognitiveservices-speech-sdk"
        }
      ],
      "auth": "mixed",
      "authNotes": "`Ocp-Apim-Subscription-Key` header with a Speech resource key, or a Microsoft Entra ID bearer token (Microsoft's recommended keyless option). Endpoints are per region or per resource. The MAI-Transcribe-2-Streaming Realtime WebSocket also takes the key as an `api-key` header or query-string parameter.",
      "pricing": "freemium",
      "pricingNotes": "Free F0 tier with 5 audio hours a month of real-time. Pay as you go in East US is $1 an hour real-time, $0.36 fast transcription, $0.18 batch, $1.20 custom real-time. Diarisation and continuous language ID in real time add $0.30 an hour each. MAI-Transcribe-2 is $0.10 an hour until 2026-12-31. MAI-Transcribe-2-Streaming is $0.54 an hour until the end of 2026 per Microsoft AI's launch post (https://microsoft.ai/news/our-first-streaming-transcription-model/), with no Azure meter found on 2026-10-05. Commitment tiers from $1,600 a month for 2,000 hours (https://azure.microsoft.com/en-us/pricing/details/speech/).",
      "priceSummary": "Freemium",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No machine payment. Billing runs through a cloud account with a card or invoice.",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 3450,
        "npmWeekly": 475621,
        "pypiWeekly": 1032532,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-to-text",
      "capabilities": [
        "speech.stt",
        "speech.streaming",
        "speech.batch",
        "speech.diarisation",
        "speech.languages",
        "speech.translation"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "closed-source",
        "python",
        "typescript",
        "enterprise",
        "streaming",
        "batch",
        "async-jobs",
        "webhooks"
      ],
      "lastRelease": "2026-09-28",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 73,
        "grade": "BB",
        "agentReady": true,
        "rank": 93,
        "ranked": true,
        "rankOf": 950,
        "categoryRank": 2,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 75,
          "maintenance": 80,
          "payments": 20,
          "reliability": 80,
          "schema": 80,
          "security": 85,
          "transparency": 85
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-05"
        },
        "negative": 0,
        "verdict": "Real-time and fast transcription audio isn't stored, and customer audio isn't used for training. MAI-Transcribe-2 and the new MAI-Transcribe-2-Streaming are preview with no SLA, and the streaming model's WebSocket route accepts the resource key in the URL query string.",
        "bestFor": "Teams on Azure who need several modes (real time, synchronous files, cheap batch, custom models) under one resource, or strict default data handling.",
        "strengths": [
          "Real-time and fast transcription audio isn't stored, and customer audio isn't used for training",
          "Fast transcription returns files up to 5 hours and 500 MB in one synchronous call",
          "Batch at $0.18 an hour, and a free F0 tier with 5 real-time hours a month",
          "429 guidance with a concrete backoff pattern of 1, 2, 4 and 4 minutes",
          "Keys or Entra ID tokens with role-based access"
        ],
        "weaknesses": [
          "MAI-Transcribe-2 and MAI-Transcribe-2-Streaming are preview with no SLA, and both introductory prices end with 2026",
          "The MAI-Transcribe-2-Streaming WebSocket docs allow the resource key as an `api-key` query parameter",
          "REST API v3.0 and the v3.2 previews were retired on 2026-03-31, and older samples still target them",
          "No llms.txt, and the pricing page needs JavaScript",
          "An Azure subscription needs a card, even for the F0 tier"
        ],
        "agentNotes": [
          "Use fast transcription (`transcriptions:transcribe`) for files under 5 hours and 500 MB, and batch for bulk jobs with `timeToLive` set",
          "Pin `api-version=2025-10-15`. v3.0 and the v3.2 previews are retired",
          "On a 429, back off 1, 2, 4 then 4 minutes. It usually means autoscaling, not a quota",
          "For MAI-Transcribe-2-Streaming, use Speech SDK 1.52 with the `/speech/universal/v2` endpoint, or send the key in the `api-key` header, never the query string",
          "Don't budget on MAI-Transcribe-2 at $0.10 or MAI-Transcribe-2-Streaming at $0.54 an hour after 2026-12-31"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 8,
        "avgRating": 3.3,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "BB",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 73
          }
        ],
        "editorialScores": {
          "ergonomics": 75,
          "maintenance": 80,
          "payments": 20,
          "reliability": 80,
          "schema": 80,
          "security": 85,
          "transparency": 80
        },
        "provenanceScore": 90
      },
      "connect": {
        "install": "pip install azure-cognitiveservices-speech   # or: npm i microsoft-cognitiveservices-speech-sdk",
        "http": "curl -X POST \"https://$AZURE_SPEECH_RESOURCE.cognitiveservices.azure.com/speechtotext/transcriptions:transcribe?api-version=2025-10-15\" \\\n  -H \"Ocp-Apim-Subscription-Key: $AZURE_SPEECH_KEY\" \\\n  -F \"audio=@call.wav\" -F 'definition={\"locales\":[\"en-US\"]}'"
      },
      "letme": {
        "capability": "https://letme.dev/speech.stt",
        "tool": "https://letme.dev/azure-speech-to-text"
      },
      "sameCompany": [
        "azure-foundry-fine-tuning",
        "azure-ai-content-safety",
        "azure-text-to-speech",
        "microsoft-agent-framework",
        "microsoft-execution-containers",
        "microsoft-entra-agent-id",
        "azure-key-vault",
        "azure-document-intelligence",
        "azure-devops-mcp",
        "microsoft-learn-mcp",
        "playwright-mcp",
        "azure-mcp",
        "azure-maps",
        "azure-translator",
        "microsoft-graph-calendar",
        "azure-blob-storage",
        "onedrive-sharepoint",
        "microsoft-teams",
        "dynamics-365-sales",
        "power-automate",
        "foundry-local",
        "microsoft-advertising-api",
        "microsoft-excel-graph",
        "outlook-mail-graph"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "Real-time standard",
          "unit": "audio-minute",
          "usd": 0.0167,
          "note": "$1 an hour, East US"
        },
        {
          "item": "Fast transcription",
          "unit": "audio-minute",
          "usd": 0.006,
          "note": "$0.36 an hour"
        },
        {
          "item": "Batch standard",
          "unit": "audio-minute",
          "usd": 0.003,
          "note": "$0.18 an hour"
        },
        {
          "item": "MAI-Transcribe-2 (preview)",
          "unit": "audio-minute",
          "usd": 0.00167,
          "note": "$0.10 an hour, promotional until 2026-12-31"
        },
        {
          "item": "MAI-Transcribe-2-Streaming (preview)",
          "unit": "audio-minute",
          "usd": 0.009,
          "note": "$0.54 an hour, introductory until the end of 2026, per Microsoft AI's launch post. No Azure meter found"
        },
        {
          "item": "Custom real-time",
          "unit": "audio-minute",
          "usd": 0.02,
          "note": "$1.20 an hour, plus endpoint hosting"
        },
        {
          "item": "Real-time add-on (diarisation or language ID)",
          "unit": "audio-minute",
          "usd": 0.005,
          "note": "$0.30 an hour per feature"
        }
      ],
      "provenance": {
        "legalEntity": "Microsoft Corporation",
        "domain": "microsoft.com",
        "domainRegistered": "1991-05-02",
        "domainNote": "Endpoints are on speech.microsoft.com, api.cognitive.microsoft.com and cognitiveservices.azure.com. microsoft.com publishes a security.txt, but it passed its Expires date on 2026-09-23.",
        "endpointOnVendorDomain": true,
        "terms": "https://www.microsoft.com/licensing/terms/",
        "privacy": "https://privacy.microsoft.com/en-us/privacystatement",
        "statusPage": "https://azure.status.microsoft/en-us/status",
        "changelog": "https://learn.microsoft.com/en-us/azure/ai-services/speech-service/releasenotes",
        "securityTxt": "expired",
        "checked": "2026-09-30",
        "score": 90
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/azure-speech-to-text.json",
      "live": {
        "slug": "azure-speech-to-text",
        "probe": {
          "target": "https://eastus.api.cognitive.microsoft.com/speechtotext",
          "method": "get",
          "lastAt": "2026-10-10T04:40:41.896015944Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 329,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 334,
          "p95ms24h": 435,
          "samples24h": 248,
          "samples30d": 2484,
          "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": 272,
              "ok": 272
            },
            {
              "date": "2026-10-05",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-06",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-07",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-08",
              "probes": 268,
              "ok": 268
            },
            {
              "date": "2026-10-09",
              "probes": 250,
              "ok": 250
            },
            {
              "date": "2026-10-10",
              "probes": 48,
              "ok": 48
            }
          ]
        },
        "vendorStatus": {
          "page": "https://azure.status.microsoft/en-us/status",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-08T10:02:53.355601307Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "Azure-Samples/cognitive-services-speech-sdk",
            "version": "ingestion-v2.1.13",
            "released": "2026-07-10",
            "seenAt": "2026-10-09T16:41:59.685551187Z"
          },
          {
            "registry": "npm",
            "name": "microsoft-cognitiveservices-speech-sdk",
            "version": "1.52.0",
            "seenAt": "2026-10-09T16:41:58.867091363Z"
          },
          {
            "registry": "pypi",
            "name": "azure-cognitiveservices-speech",
            "version": "1.52.0",
            "released": "2026-09-28",
            "seenAt": "2026-10-09T16:41:58.653131652Z"
          }
        ],
        "githubStars": 3451,
        "npmWeekly": 443378,
        "pypiWeekly": 708418,
        "securityTxt": {
          "url": "https://microsoft.com/.well-known/security.txt",
          "state": "expired",
          "expires": "2026-09-23T16:00:00.000Z",
          "checkedAt": "2026-10-09T15:40:16.790821018Z"
        },
        "domain": {
          "domain": "microsoft.com",
          "registered": "1991-05-02",
          "source": "https://rdap.verisign.com/com/v1/domain/microsoft.com",
          "checkedAt": "2026-10-04T13:04:13.488857536Z"
        },
        "pages": [
          {
            "url": "https://learn.microsoft.com/en-us/azure/ai-services/speech-service/releasenotes",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-09T18:41:11.934839768Z",
            "changedAt": "2026-10-09T18:41:11.934839768Z",
            "fingerprint": "ff387f6ed40a"
          },
          {
            "url": "https://learn.microsoft.com/en-us/azure/ai-services/speech-service/mai-transcribe",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-09T18:41:10.134039809Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "ebf9086dffd9"
          },
          {
            "url": "https://learn.microsoft.com/en-us/azure/ai-services/speech-service/rest-speech-to-text",
            "kind": "deprecations",
            "status": 304,
            "checkedAt": "2026-10-09T18:41:13.706182763Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "fd2ed8814ecb"
          },
          {
            "url": "https://azure.microsoft.com/en-us/pricing/details/speech/",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-09T18:32:58.283662913Z",
            "changedAt": "2026-10-07T18:02:47.446412299Z",
            "fingerprint": "425d06bee416"
          },
          {
            "url": "https://privacy.microsoft.com/en-us/privacystatement",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-01T13:14:57.860748137Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "07484a06f35c"
          },
          {
            "url": "https://www.microsoft.com/licensing/terms/",
            "kind": "terms",
            "status": 502,
            "checkedAt": "2026-10-01T13:17:52.720054167Z",
            "changedAt": "0001-01-01T00:00:00Z"
          }
        ],
        "updatedAt": "2026-10-10T04:40:41.896015944Z"
      }
    },
    "answer": "Azure AI Speech speech-to-text and OpenAI Speech to Text score within a point of each other on agent readiness, 73 (BB) and 72.4 (BB). OpenAI Speech to Text leads on schema \u0026 documentation.",
    "b": {
      "slug": "openai-speech-to-text",
      "name": "OpenAI Speech to Text",
      "vendor": "OpenAI",
      "vendorUrl": "https://openai.com",
      "kind": "model",
      "category": "speech-to-text",
      "summary": "OpenAI's speech-to-text API. It transcribes uploaded audio files through `/v1/audio/transcriptions`, translates recordings into English through `/v1/audio/translations`, and transcribes live audio in Realtime transcription sessions over WebSocket or WebRTC.",
      "url": "https://www.anchorterminal.com/tools/openai-speech-to-text",
      "markdownUrl": "https://www.anchorterminal.com/tools/openai-speech-to-text.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/openai-speech-to-text.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/openai-speech-to-text.json",
      "repo": "https://github.com/openai/openai-python",
      "license": "Proprietary hosted service. The service terms were not read (see open questions). The Python SDK is Apache-2.0 and the OpenAPI document is MIT",
      "transports": [
        "http",
        "websocket"
      ],
      "remoteUrl": "https://api.openai.com/v1",
      "packages": [
        {
          "registry": "pypi",
          "name": "openai"
        }
      ],
      "auth": "api-key",
      "authNotes": "Bearer API key created by a person in the platform console (https://platform.openai.com/settings/organization/api-keys). Projects can carry a model allowlist or denylist and an IP allowlist, and Admin API keys are a separate credential that cannot call the audio endpoints (https://developers.openai.com/api/docs/guides/admin-apis).",
      "pricing": "usage",
      "pricingNotes": "$0.0045 an audio minute for `gpt-transcribe` and $0.017 for `gpt-live-transcribe`, billed from prepaid credits (https://developers.openai.com/api/docs/pricing). The rate limits guide names a Free tier with a $100 monthly usage limit, and the `gpt-transcribe` model page lists limits only from the Build tier, which needs $5 of credit purchases. Whether a new account can transcribe without paying was not established.",
      "priceSummary": "Pay per use",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the transcription guides, the endpoint reference, the pricing page or the OpenAPI document (checked 2026-10-09).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 31785,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-10-09"
      },
      "docsUrl": "https://developers.openai.com/api/docs/guides/speech-to-text",
      "llmsTxt": "https://developers.openai.com/llms.txt",
      "openapi": "https://github.com/openai/openai-openapi/blob/main/openapi.yaml",
      "capabilities": [
        "speech.stt",
        "speech.streaming",
        "speech.batch",
        "speech.diarisation",
        "speech.languages"
      ],
      "tags": [
        "official",
        "hosted",
        "model",
        "streaming",
        "diarisation",
        "llms-txt",
        "openapi",
        "python",
        "typescript",
        "go",
        "java"
      ],
      "lastRelease": "2026-08-26",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 72.4,
        "grade": "BB",
        "agentReady": true,
        "rank": 106,
        "ranked": true,
        "rankOf": 950,
        "categoryRank": 3,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 78,
          "maintenance": 75,
          "payments": 20,
          "reliability": 80,
          "schema": 88,
          "security": 86,
          "transparency": 61
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-09"
        },
        "negative": 0,
        "verdict": "`gpt-transcribe` costs $0.0045 an audio minute, and the audio endpoints keep no abuse-monitoring logs or application state. Speaker labels, timestamps, subtitles and translation exist only on `whisper-1` and `gpt-4o-transcribe-diarize`, which shut down on 26 February 2027 with no named replacement for those functions.",
        "bestFor": "Suited to plain transcription of recorded files at a low price a minute and to teams already holding an OpenAI key.",
        "strengths": [
          "`gpt-transcribe` is priced at $0.0045 an audio minute on a public page, with per-tier request limits of 5,000, 10,000 and 30,000 a minute",
          "The data controls page lists `/v1/audio/transcriptions` and `/v1/audio/translations` with no training, no abuse-monitoring retention and no stored application state",
          "A public OpenAPI 3.1 document, llms.txt and a Markdown twin of every docs page cover the audio endpoints",
          "The status page has an Audio component, shown at 100% uptime for July to October 2026",
          "Guide examples cover JavaScript, Python, Go, Java, C#, Ruby, a CLI and curl, and `file` and `model` are the only required fields"
        ],
        "weaknesses": [
          "`whisper-1`, `gpt-4o-transcribe`, `gpt-4o-mini-transcribe` and `gpt-4o-transcribe-diarize` were deprecated on 26 August 2026 and shut down on 26 February 2027",
          "The two named replacements return no speaker labels, word timestamps, `srt` or `vtt` output or English translation in the reviewed documentation",
          "Uploads stop at 25 MB, the caller splits longer recordings, and the `gpt-transcribe` model page marks the Batch API as not supported",
          "The Markdown twin of the endpoint reference lists the response fields and omits the request parameters, and its first example names a deprecated model",
          "openai.com answered our reader with a bot check, so the service terms, privacy policy, sub-processor list and any SLA were not read"
        ],
        "agentNotes": [
          "Send `gpt-transcribe` to `POST /v1/audio/transcriptions` for recorded files. Use `languages` (a list), not `language`, and never send both.",
          "Keep each upload at 25 MB or less. Split longer audio between sentences and pass the previous chunk's text in `prompt`.",
          "For speaker labels send `gpt-4o-transcribe-diarize` with `response_format=diarized_json` and `chunking_strategy=auto` for audio over 30 seconds. Plan for its shutdown on 26 February 2027.",
          "Word timestamps, `srt`, `vtt` and `/v1/audio/translations` need `whisper-1`, which cannot stream and shuts down on the same date.",
          "On 429 or 503 wait at least `Retry-After` when present, then back off with jitter. Do not retry `credit_balance_exhausted` or spend-limit errors."
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "BB",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 72.4
          }
        ],
        "editorialScores": {
          "ergonomics": 78,
          "maintenance": 75,
          "payments": 20,
          "reliability": 80,
          "schema": 88,
          "security": 86,
          "transparency": 62
        },
        "provenanceScore": 59
      },
      "connect": {
        "install": "pip install openai",
        "http": "curl --request POST \\\n  --url https://api.openai.com/v1/audio/transcriptions \\\n  --header \"Authorization: Bearer $OPENAI_API_KEY\" \\\n  --header 'Content-Type: multipart/form-data' \\\n  --form file=@/path/to/file/audio.mp3 \\\n  --form model=gpt-transcribe"
      },
      "letme": {
        "capability": "https://letme.dev/speech.stt",
        "tool": "https://letme.dev/openai-speech-to-text"
      },
      "sameCompany": [
        "openai-api",
        "openai-embeddings",
        "openai-guardrails",
        "openai-moderation",
        "openai-image-api",
        "openai-sora",
        "openai-realtime",
        "openai-agents-sdk",
        "openai-decisions-api",
        "openai-codex"
      ],
      "area": "voice",
      "unitPrices": [
        {
          "item": "gpt-transcribe",
          "unit": "audio-minute",
          "usd": 0.0045
        },
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          "item": "gpt-live-transcribe (live audio)",
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      {
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        "openai-speech-to-text": 88,
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        "edge": "openai-speech-to-text",
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        "openai-speech-to-text": 86,
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        "by": 0,
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        "openai-speech-to-text": 20,
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        "azure-speech-to-text": 80,
        "by": 5,
        "edge": "azure-speech-to-text",
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "openai-speech-to-text": 75,
        "weight": 7
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      {
        "azure-speech-to-text": 85,
        "by": 24,
        "edge": "azure-speech-to-text",
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "openai-speech-to-text": 61,
        "weight": 7
      }
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    "verdicts": {
      "azure-speech-to-text": "Real-time and fast transcription audio isn't stored, and customer audio isn't used for training. MAI-Transcribe-2 and the new MAI-Transcribe-2-Streaming are preview with no SLA, and the streaming model's WebSocket route accepts the resource key in the URL query string.",
      "openai-speech-to-text": "`gpt-transcribe` costs $0.0045 an audio minute, and the audio endpoints keep no abuse-monitoring logs or application state. Speaker labels, timestamps, subtitles and translation exist only on `whisper-1` and `gpt-4o-transcribe-diarize`, which shut down on 26 February 2027 with no named replacement for those functions."
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  "markdown": "Azure AI Speech speech-to-text and OpenAI Speech to Text score within a point of each other on agent readiness, 73 (BB) and 72.4 (BB). OpenAI Speech to Text leads on schema \u0026 documentation. Both do speech-to-text.\n\n- Azure AI Speech speech-to-text: grade BB, 73/100, rank #93 of 950. Markdown https://www.anchorterminal.com/tools/azure-speech-to-text.md · JSON https://www.anchorterminal.com/api/v1/tools/azure-speech-to-text.json\n- OpenAI Speech to Text: grade BB, 72.4/100, rank #106 of 950. Markdown https://www.anchorterminal.com/tools/openai-speech-to-text.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-speech-to-text.json\n- Best speech-to-text APIs for AI agents: https://www.anchorterminal.com/best/speech-to-text/index.md\n- All 91 stt comparisons: https://www.anchorterminal.com/compare/speech-to-text/index.md\n\n## Which one, for what\n\n### Azure AI Speech speech-to-text (BB)\n\nGood for: Teams on Azure who need several modes (real time, synchronous files, cheap batch, custom models) under one resource, or strict default data handling.\n\nAhead on:\n- Maintenance \u0026 community, 80 against 75\n- Transparency \u0026 trust, 85 against 61\n\nWatch for: MAI-Transcribe-2 and MAI-Transcribe-2-Streaming are preview with no SLA, and both introductory prices end with 2026\n\n### OpenAI Speech to Text (BB)\n\nGood for: Suited to plain transcription of recorded files at a low price a minute and to teams already holding an OpenAI key.\n\nAhead on:\n- Schema \u0026 documentation, 88 against 80\n\nWatch for: `whisper-1`, `gpt-4o-transcribe`, `gpt-4o-mini-transcribe` and `gpt-4o-transcribe-diarize` were deprecated on 26 August 2026 and shut down on 26 February 2027\n\n\n## Score by category\n\n| Category | Weight | Azure AI Speech speech-to-text | OpenAI Speech to Text | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 80 | 80 | even |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 80 | 88 | OpenAI Speech to Text +8 |\n| Agent ergonomics | 13% (16.2 this run) | 75 | 78 | OpenAI Speech to Text +3 |\n| Security \u0026 auth | 14% (17.5 this run) | 85 | 86 | OpenAI Speech to Text +1 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 20 | 20 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 80 | 75 | Azure AI Speech speech-to-text +5 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 85 | 61 | Azure AI Speech speech-to-text +24 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **73 · BB** | **72.4 · BB** | |\n\n## Facts side by side\n\n| Fact | Azure AI Speech speech-to-text | OpenAI Speech to Text |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Microsoft Azure | OpenAI |\n| Hosted endpoint | `https://eastus.api.cognitive.microsoft.com/speechtotext` | `https://api.openai.com/v1` |\n| Transports | HTTP | HTTP, websocket |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Pay per use |\n| x402 | no | no |\n| Licence | MIT (samples), SDK under Microsoft's own licence | Proprietary hosted service. The service terms were not read (see open questions). The Python SDK is Apache-2.0 and the OpenAPI document is MIT |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| Last release | 2026-09-28 | 2026-08-26 |\n| Terms last updated | couldn't be read | couldn't be read |\n| Privacy policy last updated | 2026-09-01 | couldn't be read |\n| Customer content may train models | yes | couldn't be read |\n| Terms restrict automated access | couldn't be read | couldn't be read |\n| Terms restrict benchmarking | couldn't be read | couldn't be read |\n| Terms or service can change without notice | couldn't be read | couldn't be read |\n| Arbitration or class-action waiver | couldn't be read | couldn't be read |\n| Popularity | 3.5k stars, 476k npm/wk, 1M PyPI/wk | 32k stars |\n| Agent reviews | 3.3/5 (8) | none |\n\n## Verdicts\n\n**Azure AI Speech speech-to-text.** Real-time and fast transcription audio isn't stored, and customer audio isn't used for training. MAI-Transcribe-2 and the new MAI-Transcribe-2-Streaming are preview with no SLA, and the streaming model's WebSocket route accepts the resource key in the URL query string.\n\n**OpenAI Speech to Text.** `gpt-transcribe` costs $0.0045 an audio minute, and the audio endpoints keep no abuse-monitoring logs or application state. Speaker labels, timestamps, subtitles and translation exist only on `whisper-1` and `gpt-4o-transcribe-diarize`, which shut down on 26 February 2027 with no named replacement for those functions.\n\n## Before you call either\n\n### Azure AI Speech speech-to-text\n\n1. Use fast transcription (`transcriptions:transcribe`) for files under 5 hours and 500 MB, and batch for bulk jobs with `timeToLive` set\n2. Pin `api-version=2025-10-15`. v3.0 and the v3.2 previews are retired\n3. On a 429, back off 1, 2, 4 then 4 minutes. It usually means autoscaling, not a quota\n4. For MAI-Transcribe-2-Streaming, use Speech SDK 1.52 with the `/speech/universal/v2` endpoint, or send the key in the `api-key` header, never the query string\n5. Don't budget on MAI-Transcribe-2 at $0.10 or MAI-Transcribe-2-Streaming at $0.54 an hour after 2026-12-31\n\n### OpenAI Speech to Text\n\n1. Send `gpt-transcribe` to `POST /v1/audio/transcriptions` for recorded files. Use `languages` (a list), not `language`, and never send both.\n2. Keep each upload at 25 MB or less. Split longer audio between sentences and pass the previous chunk's text in `prompt`.\n3. For speaker labels send `gpt-4o-transcribe-diarize` with `response_format=diarized_json` and `chunking_strategy=auto` for audio over 30 seconds. Plan for its shutdown on 26 February 2027.\n4. Word timestamps, `srt`, `vtt` and `/v1/audio/translations` need `whisper-1`, which cannot stream and shuts down on the same date.\n5. On 429 or 503 wait at least `Retry-After` when present, then back off with jitter. Do not retry `credit_balance_exhausted` or spend-limit errors.\n\n## Questions\n\n### Which is better for AI agents, Azure AI Speech speech-to-text or OpenAI Speech to Text?\n\nAzure AI Speech speech-to-text and OpenAI Speech to Text score within a point of each other on agent readiness, 73 (BB) and 72.4 (BB). OpenAI Speech to Text leads on schema \u0026 documentation.\n\n### Do Azure AI Speech speech-to-text and OpenAI Speech to Text need an API key?\n\nAzure AI Speech speech-to-text takes an API key or an OAuth sign-in. OpenAI Speech to Text needs an API key.\n\n### Can an agent call Azure AI Speech speech-to-text and OpenAI Speech to Text without installing anything?\n\nYes. Azure AI Speech speech-to-text has a hosted endpoint at https://eastus.api.cognitive.microsoft.com/speechtotext and OpenAI Speech to Text at https://api.openai.com/v1.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/azure-speech-to-text-vs-openai-speech-to-text.json, and with the fewest tokens: https://www.anchorterminal.com/compare/azure-speech-to-text-vs-openai-speech-to-text.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"azure-speech-to-text\", \"b\": \"openai-speech-to-text\"}`. From a terminal: `anchor compare azure-speech-to-text openai-speech-to-text`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/azure-speech-to-text.json and https://www.anchorterminal.com/api/v1/tools/openai-speech-to-text.json\n\n## Other comparisons with Azure AI Speech speech-to-text or OpenAI Speech to Text\n\n- [Amazon Transcribe vs Azure AI Speech speech-to-text](https://www.anchorterminal.com/compare/amazon-transcribe-vs-azure-speech-to-text.md)\n- [Amazon Transcribe vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/amazon-transcribe-vs-openai-speech-to-text.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 OpenAI Speech to Text](https://www.anchorterminal.com/compare/assemblyai-stt-vs-openai-speech-to-text.md)\n- [Azure AI Speech speech-to-text vs Cartesia Ink](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-cartesia-ink-stt.md)\n- [Azure AI Speech speech-to-text vs Deepgram Speech-to-Text (Nova-3, Flux)](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-deepgram-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- [Azure AI Speech speech-to-text vs Gladia Speech-to-Text API + MCP](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-gladia-stt.md)\n- [Azure AI Speech speech-to-text vs Google Cloud Speech-to-Text](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-google-speech-to-text.md)\n- [Azure AI Speech speech-to-text vs Groq Speech-to-Text](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-groq-speech-to-text.md)\n- [Azure AI Speech speech-to-text vs Mistral Voxtral Transcribe](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-mistral-voxtral-transcribe.md)\n- [Azure AI Speech speech-to-text vs Rev AI Speech-to-Text API](https://www.anchorterminal.com/compare/azure-speech-to-text-vs-rev-ai-stt.md)\n- [Azure AI Speech speech-to-text vs Soniox Speech-to-Text](https://www.anchorterminal.com/compare/azure-speech-to-text-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- [Cartesia Ink vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/cartesia-ink-stt-vs-openai-speech-to-text.md)\n- [Deepgram Speech-to-Text (Nova-3, Flux) vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/deepgram-stt-vs-openai-speech-to-text.md)\n- [ElevenLabs Scribe Speech to Text API vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/elevenlabs-scribe-vs-openai-speech-to-text.md)\n- [Gladia Speech-to-Text API + MCP vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/gladia-stt-vs-openai-speech-to-text.md)\n- [Google Cloud Speech-to-Text vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/google-speech-to-text-vs-openai-speech-to-text.md)\n- [Groq Speech-to-Text vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/groq-speech-to-text-vs-openai-speech-to-text.md)\n- [Mistral Voxtral Transcribe vs OpenAI Speech to Text](https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-openai-speech-to-text.md)\n- [OpenAI Speech to Text vs Rev AI Speech-to-Text API](https://www.anchorterminal.com/compare/openai-speech-to-text-vs-rev-ai-stt.md)\n- [OpenAI Speech to Text vs Soniox Speech-to-Text](https://www.anchorterminal.com/compare/openai-speech-to-text-vs-soniox-stt.md)\n- [OpenAI Speech to Text vs Speechmatics Speech-to-Text](https://www.anchorterminal.com/compare/openai-speech-to-text-vs-speechmatics-stt.md)\n",
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