# Mistral Voxtral Transcribe vs Soniox Speech-to-Text

> Mistral Voxtral Transcribe scores 64.1 (B) on agent readiness against Soniox Speech-to-Text's 58.2 (C), and leads in 5 of 7 scored categories. Soniox Speech-to-Text leads on reliability. Both do speech stt. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-soniox-stt
- Markdown: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-soniox-stt.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-soniox-stt.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-soniox-stt.json (this page as data, same URL with Accept: application/json)
- 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

Mistral Voxtral Transcribe scores 64.1 (B) on agent readiness against Soniox Speech-to-Text's 58.2 (C), and leads in 5 of 7 scored categories. Soniox Speech-to-Text leads on reliability. 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
- Soniox Speech-to-Text: grade C, 58.2/100, rank #529 of 842. Markdown https://www.anchorterminal.com/tools/soniox-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/soniox-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 60
- Agent ergonomics, 77 against 70
- Payments & pricing, 40 against 20
- Maintenance & community, 66 against 30
- Transparency & trust, 82 against 76

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

### Soniox Speech-to-Text (C)

Good for: Price-led multilingual transcription and translation, live or async, and for operators who want no training and no retention.

Ahead on:
- Reliability, 65 against 53

Also in its favour:
- No incidents deducted, where Mistral Voxtral Transcribe loses 3 points for them

Watch for: No free credits for new accounts since October 2025


## Score by category

| Category | Weight | Mistral Voxtral Transcribe | Soniox Speech-to-Text | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 53 | 65 | Soniox Speech-to-Text +12 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 60 | Mistral Voxtral Transcribe +25 |
| Agent ergonomics | 13% (16.2 this run) | 77 | 70 | Mistral Voxtral Transcribe +7 |
| Security & auth | 14% (17.5 this run) | 70 | 70 | even |
| Payments & pricing | 10% (12.5 this run) | 40 | 20 | Mistral Voxtral Transcribe +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 66 | 30 | Mistral Voxtral Transcribe +36 |
| Transparency & trust | 7% (8.8 this run) | 82 | 76 | Mistral Voxtral Transcribe +6 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **64.1 · B** | **58.2 · C** | |

## Facts side by side

| Fact | Mistral Voxtral Transcribe | Soniox Speech-to-Text |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Mistral AI | Soniox |
| Hosted endpoint | `https://api.mistral.ai/v1` | `https://api.soniox.com/v1` |
| Transports | HTTP, websocket | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Pay per use |
| Price for speech stt | not published | $0.0017 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 | Apache-2.0 (Python SDK) |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-02-04 | 2026-08-11 |
| Terms last updated | 2026-09-25 | 2026-06-29 |
| Privacy policy last updated | 2026-09-03 | 2026-06-29 |
| 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 | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 773 stars | 12 stars, 22k npm/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.

**Soniox Speech-to-Text.** About $0.10 an hour async and $0.12 real time, with diarisation, language ID and translation included. No free credits for new accounts since October 2025.

## 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

### Soniox Speech-to-Text

1. Pass `audio_url` for public files and skip the upload step. Delete uploaded files or they count against the 10 GB quota for 30 days
2. Use the `context` field for names and domain terms
3. Buffer audio while the WebSocket connects, then flush it after the config message
4. Split anything over 300 minutes. The cap is fixed
5. Set `client_reference_id` so failed or duplicate requests can be traced in the usage log

## Questions

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

Mistral Voxtral Transcribe scores 64.1 (B) on agent readiness against Soniox Speech-to-Text's 58.2 (C), and leads in 5 of 7 scored categories. Soniox Speech-to-Text leads on reliability.

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

Both need an API key.

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

Yes. Mistral Voxtral Transcribe has a hosted endpoint at https://api.mistral.ai/v1 and Soniox Speech-to-Text at https://api.soniox.com/v1.


## For agents

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

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