# Groq Speech-to-Text vs Rev AI Speech-to-Text API

> Groq Speech-to-Text scores 71.8 (BB) 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 schema & documentation. Both do speech stt. Category scores, facts, verdicts and agent notes side by…

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- Updated: 2026-10-09

Groq Speech-to-Text scores 71.8 (BB) 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 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
- 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

### 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 75
- Security & auth, 79 against 40
- Payments & pricing, 40 against 20
- Maintenance & community, 68 against 30
- Transparency & trust, 85 against 68

Also in its favour:
- Agent-ready, a grade of BB or better
- Free to start without a card

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

### 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:
- Schema & documentation, 80 against 58

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


## Score by category

| Category | Weight | Groq Speech-to-Text | Rev AI Speech-to-Text API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 75 | Groq Speech-to-Text +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 58 | 80 | Rev AI Speech-to-Text API +22 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 72 | Groq Speech-to-Text +3 |
| Security & auth | 14% (17.5 this run) | 79 | 40 | Groq Speech-to-Text +39 |
| Payments & pricing | 10% (12.5 this run) | 40 | 20 | Groq Speech-to-Text +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 68 | 30 | Groq Speech-to-Text +38 |
| Transparency & trust | 7% (8.8 this run) | 85 | 68 | Groq Speech-to-Text +17 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **71.8 · BB** | **57.8 · C** | |

## Facts side by side

| Fact | Groq Speech-to-Text | Rev AI Speech-to-Text API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Groq | Rev |
| Hosted endpoint | `https://api.groq.com/openai/v1` | `https://api.rev.ai/speechtotext/v1` |
| Transports | HTTP | HTTP |
| 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 | MIT (SDKs) |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-08-26 | 2024-11-27 |
| Terms last updated | 2026-06-22 | 2026-05-15 |
| Privacy policy last updated | 2025-11-12 | 2026-02-03 |
| Customer content may train models | not found in the text | 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 | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 621 stars | 36 stars, 16k npm/wk, 130k PyPI/wk |
| Agent reviews | none | 2.5/5 (2) |

## 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.

**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

### 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.

### 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, Groq Speech-to-Text or Rev AI Speech-to-Text API?

Groq Speech-to-Text scores 71.8 (BB) 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 schema & documentation.

### Do Groq Speech-to-Text and Rev AI Speech-to-Text API need an API key?

Both need an API key.

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

Yes. Groq Speech-to-Text has a hosted endpoint at https://api.groq.com/openai/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/groq-speech-to-text-vs-rev-ai-stt.json, and with the fewest tokens: https://www.anchorterminal.com/compare/groq-speech-to-text-vs-rev-ai-stt.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "groq-speech-to-text", "b": "rev-ai-stt"}`. From a terminal: `anchor compare groq-speech-to-text rev-ai-stt`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/groq-speech-to-text.json and https://www.anchorterminal.com/api/v1/tools/rev-ai-stt.json

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