# Groq Speech-to-Text vs Mistral Voxtral Transcribe

> Groq Speech-to-Text scores 71.8 (BB) on agent readiness against Mistral Voxtral Transcribe's 64.1 (B), and leads in 4 of 7 scored categories. Mistral Voxtral Transcribe leads on schema & documentation. Both do speech stt. Category scores, facts, verdicts and agent notes side by…

- Canonical: https://www.anchorterminal.com/compare/groq-speech-to-text-vs-mistral-voxtral-transcribe
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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

Groq Speech-to-Text scores 71.8 (BB) on agent readiness against Mistral Voxtral Transcribe's 64.1 (B), and leads in 4 of 7 scored categories. Mistral Voxtral Transcribe leads on schema & documentation. Both do speech stt.

- Groq Speech-to-Text: grade BB, 71.8/100, rank #113 of 842. Markdown https://www.anchorterminal.com/tools/groq-speech-to-text.md · JSON https://www.anchorterminal.com/api/v1/tools/groq-speech-to-text.json
- 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

## Which one, for what

### Groq Speech-to-Text (BB)

Good for: Suited to cheap, fast transcription of recorded files in many languages, and to agents that already hold a Groq key or use an OpenAI-compatible client.

Ahead on:
- Reliability, 90 against 53
- Security & auth, 79 against 70

Also in its favour:
- Agent-ready, a grade of BB or better
- Free to start without a card
- No incidents deducted, where Mistral Voxtral Transcribe loses 3 points for them

Watch for: No streaming or realtime endpoint and no diarisation in the reviewed documentation

### 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 58

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


## Score by category

| Category | Weight | Groq Speech-to-Text | Mistral Voxtral Transcribe | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 53 | Groq Speech-to-Text +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 58 | 85 | Mistral Voxtral Transcribe +27 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 77 | Mistral Voxtral Transcribe +2 |
| Security & auth | 14% (17.5 this run) | 79 | 70 | Groq Speech-to-Text +9 |
| 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) | 68 | 66 | Groq Speech-to-Text +2 |
| Transparency & trust | 7% (8.8 this run) | 85 | 82 | Groq Speech-to-Text +3 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **71.8 · BB** | **64.1 · B** | |

## Facts side by side

| Fact | Groq Speech-to-Text | Mistral Voxtral Transcribe |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Groq | Mistral AI |
| Hosted endpoint | `https://api.groq.com/openai/v1` | `https://api.mistral.ai/v1` |
| Transports | HTTP | HTTP, websocket |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Proprietary hosted service under the Groq Services Agreement. The SDKs are Apache-2.0 and the Whisper weights are published by OpenAI on Hugging Face | Proprietary hosted service under Mistral's commercial terms. Voxtral Mini 4B Realtime weights and the SDKs are Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-08-26 | 2026-02-04 |
| Terms last updated | 2026-06-22 | 2026-09-25 |
| Privacy policy last updated | 2025-11-12 | 2026-09-03 |
| Customer content may train models | not found in the text | yes, with an opt-out |
| 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 | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 621 stars | 773 stars |

## Verdicts

**Groq Speech-to-Text.** Whisper Large v3 Turbo costs $0.04 an audio hour and Whisper Large v3 $0.111, with a no-card free plan and zero data retention as a self-serve setting. There is no streaming endpoint, no diarisation and no subtitle output, and uploads stop at 25 MB on the free plan and 100 MB on the Developer plan.

**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.

## Before you call either

### Groq Speech-to-Text

1. Send `whisper-large-v3-turbo` for transcription and `whisper-large-v3` for translation to English. The translations endpoint does not accept Turbo.
2. Pass `url` instead of `file` for audio over 25 MB, and split anything over the plan's size limit into overlapping chunks before sending.
3. Set `response_format` to `verbose_json` before asking for `timestamp_granularities[]`. Word timestamps add latency, segment timestamps do not.
4. Every request is billed as at least 10 seconds of audio, so join very short clips where the task allows.
5. Read `retry-after` on a 429 and back off. Audio limits count seconds an hour and a day as well as requests.

### 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

## Questions

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

Groq Speech-to-Text scores 71.8 (BB) on agent readiness against Mistral Voxtral Transcribe's 64.1 (B), and leads in 4 of 7 scored categories. Mistral Voxtral Transcribe leads on schema & documentation.

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

Both need an API key.

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

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


## For agents

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

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