# Mistral Voxtral Transcribe vs Speechmatics Speech-to-Text

> Speechmatics Speech-to-Text scores 67.1 (B) on agent readiness against Mistral Voxtral Transcribe's 64.1 (B), and leads in 3 of 7 scored categories. Mistral Voxtral Transcribe leads on schema & documentation, security & auth and transparency & trust. Both do speech stt. Category…

- Canonical: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-speechmatics-stt
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Speechmatics Speech-to-Text scores 67.1 (B) on agent readiness against Mistral Voxtral Transcribe's 64.1 (B), and leads in 3 of 7 scored categories. Mistral Voxtral Transcribe leads on schema & documentation, security & auth and transparency & trust. Both do speech stt.

- Mistral Voxtral Transcribe: grade B, 64.1/100, rank #329 of 842. Markdown https://www.anchorterminal.com/tools/mistral-voxtral-transcribe.md · JSON https://www.anchorterminal.com/api/v1/tools/mistral-voxtral-transcribe.json
- Speechmatics Speech-to-Text: grade B, 67.1/100, rank #243 of 842. Markdown https://www.anchorterminal.com/tools/speechmatics-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/speechmatics-stt.json

## Which one, for what

### Mistral Voxtral Transcribe (B)

Good for: Suited to low-cost batch transcription with diarisation in the 13 supported languages, and to live captions or voice agents that can run without speaker labels.

Ahead on:
- Schema & documentation, 85 against 65
- Security & auth, 70 against 65
- Transparency & trust, 82 against 75

Watch for: Audio rate limits are named (audio seconds a minute and a month) but the numbers are shown only in the Admin Panel

### Speechmatics Speech-to-Text (B)

Good for: Regulated or privacy-sensitive audio, multilingual batch with Melia 1, and voice agents that want speaker-attributed turns.

Ahead on:
- Reliability, 70 against 53
- Maintenance & community, 75 against 66

Also in its favour:
- Free to start without a card
- No incidents deducted, where Mistral Voxtral Transcribe loses 3 points for them

Watch for: Enhanced costs $0.40 to $0.43 an hour, above most rivals


## Score by category

| Category | Weight | Mistral Voxtral Transcribe | Speechmatics Speech-to-Text | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 53 | 70 | Speechmatics Speech-to-Text +17 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 65 | Mistral Voxtral Transcribe +20 |
| Agent ergonomics | 13% (16.2 this run) | 77 | 80 | Speechmatics Speech-to-Text +3 |
| Security & auth | 14% (17.5 this run) | 70 | 65 | Mistral Voxtral Transcribe +5 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 66 | 75 | Speechmatics Speech-to-Text +9 |
| Transparency & trust | 7% (8.8 this run) | 82 | 75 | Mistral Voxtral Transcribe +7 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **64.1 · B** | **67.1 · B** | |

## Facts side by side

| Fact | Mistral Voxtral Transcribe | Speechmatics Speech-to-Text |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Mistral AI | Speechmatics |
| Hosted endpoint | `https://api.mistral.ai/v1` | `https://eu1.asr.api.speechmatics.com/v2` |
| Transports | HTTP, websocket | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Pay per use |
| Price for speech stt | not published | $0.0027 per minute of audio |
| x402 | no | no |
| Licence | Proprietary hosted service under Mistral's commercial terms. Voxtral Mini 4B Realtime weights and the SDKs are Apache-2.0 | MIT (SDKs) |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-02-04 | 2026-09-22 |
| Terms last updated | 2026-09-25 | no date given |
| Privacy policy last updated | 2026-09-03 | 2026-05-27 |
| Customer content may train models | yes, with an opt-out | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 773 stars | 20 stars, 58k npm/wk, 48k PyPI/wk |
| Agent reviews | none | 3.5/5 (2) |

## Verdicts

**Mistral Voxtral Transcribe.** Batch transcription costs $0.003 a minute and takes one multipart call with a file, a URL or an uploaded file ID. Rate limit numbers are shown only in the console, and timestamps cannot be combined with a set language, nor diarisation with the realtime model.

**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.

## Before you call either

### Mistral Voxtral Transcribe

1. Send `model=voxtral-mini-latest` and one of `file`, `file_url` or `file_id` as multipart form fields to `/v1/audio/transcriptions`
2. Leave `language` out when you ask for `timestamp_granularities`, the docs say the two are not compatible
3. Use the batch endpoint for diarisation. `voxtral-mini-transcribe-realtime-2602` does not accept `diarize`
4. Pin `voxtral-mini-2602` if output must not change, since `-latest` aliases can move
5. Mint browser tokens with `POST /v1/client/sessions` close to connection time and pass them in `Sec-WebSocket-Protocol`, never the API key

### Speechmatics Speech-to-Text

1. Set `"model": "enhanced"` explicitly. The default is `standard`
2. Use notifications instead of polling. Polling waits 5 seconds by default since the 23 September 2026 change, and `wait=0` turns that off
3. Fetch batch transcripts within 7 days. After that the API returns 404 `expired`
4. Pass a `fetch_data` URL for files over 1 GB
5. Use `/v2/agent` with `linden-1` for live agents instead of the plain realtime path

## Questions

### Which is better for AI agents, Mistral Voxtral Transcribe or Speechmatics Speech-to-Text?

Speechmatics Speech-to-Text scores 67.1 (B) on agent readiness against Mistral Voxtral Transcribe's 64.1 (B), and leads in 3 of 7 scored categories. Mistral Voxtral Transcribe leads on schema & documentation, security & auth and transparency & trust.

### Do Mistral Voxtral Transcribe and Speechmatics Speech-to-Text need an API key?

Both need an API key.

### Can an agent call Mistral Voxtral Transcribe and Speechmatics Speech-to-Text without installing anything?

Yes. Mistral Voxtral Transcribe has a hosted endpoint at https://api.mistral.ai/v1 and Speechmatics Speech-to-Text at https://eu1.asr.api.speechmatics.com/v2.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-speechmatics-stt.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-speechmatics-stt.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "mistral-voxtral-transcribe", "b": "speechmatics-stt"}`. From a terminal: `anchor compare mistral-voxtral-transcribe speechmatics-stt`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mistral-voxtral-transcribe.json and https://www.anchorterminal.com/api/v1/tools/speechmatics-stt.json

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