# Google Cloud Speech-to-Text vs Mistral Voxtral Transcribe

> Google Cloud Speech-to-Text scores 70.2 (BB) 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, agent ergonomics, payments & pricing and maintenance & community.…

- Canonical: https://www.anchorterminal.com/compare/google-speech-to-text-vs-mistral-voxtral-transcribe
- Markdown: https://www.anchorterminal.com/compare/google-speech-to-text-vs-mistral-voxtral-transcribe.md (~2,700 tokens)
- Slim: https://www.anchorterminal.com/compare/google-speech-to-text-vs-mistral-voxtral-transcribe.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/google-speech-to-text-vs-mistral-voxtral-transcribe.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

Google Cloud Speech-to-Text scores 70.2 (BB) 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, agent ergonomics, payments & pricing and maintenance & community. Both do speech stt.

- Google Cloud Speech-to-Text: grade BB, 70.2/100, rank #152 of 842. Markdown https://www.anchorterminal.com/tools/google-speech-to-text.md · JSON https://www.anchorterminal.com/api/v1/tools/google-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

### Google Cloud Speech-to-Text (BB)

Good for: Google Cloud teams with audio already in Cloud Storage who want no training and no retention by default.

Ahead on:
- Reliability, 85 against 53
- Security & auth, 95 against 70

Also in its favour:
- Agent-ready, a grade of BB or better
- No incidents deducted, where Mistral Voxtral Transcribe loses 3 points for them

Watch for: No release note since 2025-11-13

### 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 70
- Payments & pricing, 40 against 20
- Maintenance & community, 66 against 25

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 | Google Cloud Speech-to-Text | Mistral Voxtral Transcribe | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 85 | 53 | Google Cloud Speech-to-Text +32 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 85 | Mistral Voxtral Transcribe +5 |
| Agent ergonomics | 13% (16.2 this run) | 70 | 77 | Mistral Voxtral Transcribe +7 |
| Security & auth | 14% (17.5 this run) | 95 | 70 | Google Cloud Speech-to-Text +25 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Mistral Voxtral Transcribe +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 25 | 66 | Mistral Voxtral Transcribe +41 |
| Transparency & trust | 7% (8.8 this run) | 86 | 82 | Google Cloud Speech-to-Text +4 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **70.2 · BB** | **64.1 · B** | |

## Facts side by side

| Fact | Google Cloud Speech-to-Text | Mistral Voxtral Transcribe |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Google Cloud | Mistral AI |
| Hosted endpoint | `https://speech.googleapis.com/v2` | `https://api.mistral.ai/v1` |
| Transports | HTTP | HTTP, websocket |
| Auth | OAuth | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 (SDKs) | 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 | no | yes |
| Last release | 2026-09-28 | 2026-02-04 |
| Terms last updated | 2026-09-02 | 2026-09-25 |
| Privacy policy last updated | 2026-10-01 | 2026-09-03 |
| Customer content may train models | yes | yes, with an opt-out |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | 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 | 713k npm/wk, 3.7M PyPI/wk | 773 stars |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**Google Cloud Speech-to-Text.** Audio isn't stored or used for training unless the project opts in to data logging. No release note since 2025-11-13.

**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

### Google Cloud Speech-to-Text

1. Call Chirp 3 on the `us` or `eu` endpoint. It isn't listed for the `global` location
2. Reopen streams before the 5-minute limit, or use `BatchRecognize` for recordings
3. Downmix stereo unless you need channel labels, since each channel is billed
4. Set dynamic batch on offline jobs to cut the price from $0.016 to $0.003 a minute
5. Back off on `RESOURCE_EXHAUSTED`. The Speech docs don't give a retry interval

### 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, Google Cloud Speech-to-Text or Mistral Voxtral Transcribe?

Google Cloud Speech-to-Text scores 70.2 (BB) 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, agent ergonomics, payments & pricing and maintenance & community.

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

Google Cloud Speech-to-Text uses an OAuth sign-in. Mistral Voxtral Transcribe needs an API key.

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

Yes. Google Cloud Speech-to-Text has a hosted endpoint at https://speech.googleapis.com/v2 and Mistral Voxtral Transcribe at https://api.mistral.ai/v1.


## For agents

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

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