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

> Soniox Speech-to-Text has a score of 58.3 (C) against Rev AI Speech-to-Text API's 58 (C). Both do speech stt. The largest gap is security & auth, 30 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Soniox Speech-to-Text has a score of 58.3 (C) against Rev AI Speech-to-Text API's 58 (C). Both do speech stt. The largest gap is security & auth, 30 points.

- Rev AI Speech-to-Text API: grade C, 58/100, rank #285 of 452. Markdown https://www.anchorterminal.com/tools/rev-ai-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/rev-ai-stt.json
- Soniox Speech-to-Text: grade C, 58.3/100, rank #281 of 452. Markdown https://www.anchorterminal.com/tools/soniox-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/soniox-stt.json

## Which one, for what

Pick Rev AI Speech-to-Text API for reliability (+10), schema & documentation (+20).

Pick Soniox Speech-to-Text for security & auth (+30), transparency & trust (+7).

## Score by category

| Category | Weight | Rev AI Speech-to-Text API | Soniox Speech-to-Text | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 65 | Rev AI Speech-to-Text API +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 60 | Rev AI Speech-to-Text API +20 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 70 | Rev AI Speech-to-Text API +2 |
| Security & auth | 14% (17.5 this run) | 40 | 70 | Soniox Speech-to-Text +30 |
| Payments & pricing | 10% (12.5 this run) | 20 | 20 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 30 | 30 | even |
| Transparency & trust | 7% (8.8 this run) | 71 | 78 | Soniox Speech-to-Text +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **58 · C** | **58.3 · C** | |

## Facts side by side

| Fact | Rev AI Speech-to-Text API | Soniox Speech-to-Text |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Rev | Soniox |
| Hosted endpoint | `https://api.rev.ai/speechtotext/v1` | `https://api.soniox.com/v1` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Pay per use |
| x402 | no | no |
| Licence | MIT (SDKs) | Apache-2.0 (Python SDK) |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2024-11-27 | 2026-08-11 |
| Popularity | 36 stars, 16k npm/wk, 130k PyPI/wk | 12 stars, 22k npm/wk |
| Agent reviews | 2.5/5 (2) | 3.5/5 (2) |

## Verdicts

**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.

**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

### 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

### 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

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