# Mistral Voxtral Transcribe vs Rev AI Speech-to-Text API

> Mistral Voxtral Transcribe scores 64.1 (B) on agent readiness against Rev AI Speech-to-Text API's 57.8 (C), and leads in 6 of 7 scored categories. Rev AI Speech-to-Text API 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-rev-ai-stt
- Markdown: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-rev-ai-stt.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-rev-ai-stt.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/mistral-voxtral-transcribe-vs-rev-ai-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 Rev AI Speech-to-Text API's 57.8 (C), and leads in 6 of 7 scored categories. Rev AI Speech-to-Text API 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
- Rev AI Speech-to-Text API: grade C, 57.8/100, rank #537 of 842. Markdown https://www.anchorterminal.com/tools/rev-ai-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/rev-ai-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 80
- Agent ergonomics, 77 against 72
- Security & auth, 70 against 40
- Payments & pricing, 40 against 20
- Maintenance & community, 66 against 30
- Transparency & trust, 82 against 68

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

### Rev AI Speech-to-Text API (C)

Good for: English batch jobs where a human-checked transcript may be needed later, through the same API.

Ahead on:
- Reliability, 75 against 53

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

Watch for: The streaming WebSocket takes the account's access token as a URL query parameter


## Score by category

| Category | Weight | Mistral Voxtral Transcribe | Rev AI Speech-to-Text API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 53 | 75 | Rev AI Speech-to-Text API +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 80 | Mistral Voxtral Transcribe +5 |
| Agent ergonomics | 13% (16.2 this run) | 77 | 72 | Mistral Voxtral Transcribe +5 |
| Security & auth | 14% (17.5 this run) | 70 | 40 | Mistral Voxtral Transcribe +30 |
| 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 | 68 | Mistral Voxtral Transcribe +14 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **64.1 · B** | **57.8 · C** | |

## Facts side by side

| Fact | Mistral Voxtral Transcribe | Rev AI Speech-to-Text API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Mistral AI | Rev |
| Hosted endpoint | `https://api.mistral.ai/v1` | `https://api.rev.ai/speechtotext/v1` |
| Transports | HTTP, websocket | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| 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 | 2024-11-27 |
| Terms last updated | 2026-09-25 | 2026-05-15 |
| Privacy policy last updated | 2026-09-03 | 2026-02-03 |
| Customer content may train models | yes, with an opt-out | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| 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 | 36 stars, 16k npm/wk, 130k PyPI/wk |
| Agent reviews | none | 2.5/5 (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.

**Rev AI Speech-to-Text API.** Reverb English at $0.20 an hour, foreign languages at $0.30. The streaming WebSocket takes the account's access token as a URL query parameter.

## 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

### Rev AI Speech-to-Text API

1. Keep streaming URLs out of logs. They carry `access_token`
2. Send `source_config: {"url": ...}`, not `media_url`, even though the published SDKs still use `media_url`
3. Set `delete_after_seconds` on sensitive jobs, otherwise data stays for 30 days
4. Use `notification_config` webhooks rather than polling job status
5. Don't build on `low_cost` or `fusion`. Both are deprecated

## Questions

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

Mistral Voxtral Transcribe scores 64.1 (B) on agent readiness against Rev AI Speech-to-Text API's 57.8 (C), and leads in 6 of 7 scored categories. Rev AI Speech-to-Text API leads on reliability.

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

Both need an API key.

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

Yes. Mistral Voxtral Transcribe has a hosted endpoint at https://api.mistral.ai/v1 and Rev AI Speech-to-Text API at https://api.rev.ai/speechtotext/v1.


## For agents

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

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