Head to head · Speech stt · October 2026 research run
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.
Rev AI Speech-to-Text APIRev · Model API
C58/100#285 of 452
Soniox Speech-to-TextSoniox · Model API
C58.3/100#281 of 452
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 this run | Rev AI Speech-to-Text API | Soniox Speech-to-Text | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 75 | 65 | Rev AI Speech-to-Text API +10 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 80 | 60 | Rev AI Speech-to-Text API +20 |
| Agent ergonomics | 13%16.2 | 72 | 70 | Rev AI Speech-to-Text API +2 |
| Security & auth | 14%17.5 | 40 | 70 | Soniox Speech-to-Text +30 |
| Payments & pricing | 10%12.5 | 20 | 20 | even |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 30 | 30 | even |
| Transparency & trust | 7%8.8 | 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
- Keep streaming URLs out of logs. They carry
access_token - Send
source_config: {"url": ...}, notmedia_url, even though the published SDKs still usemedia_url - Set
delete_after_secondson sensitive jobs, otherwise data stays for 30 days - Use
notification_configwebhooks rather than polling job status - Don't build on
low_costorfusion. Both are deprecated
Soniox Speech-to-Text
- Pass
audio_urlfor public files and skip the upload step. Delete uploaded files or they count against the 10 GB quota for 30 days - Use the
contextfield for names and domain terms - Buffer audio while the WebSocket connects, then flush it after the config message
- Split anything over 300 minutes. The cap is fixed
- Set
client_reference_idso failed or duplicate requests can be traced in the usage log
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Machine-readable
/api/v1/tools/rev-ai-stt.json·/api/v1/tools/soniox-stt.json- This page as Markdown,
/compare/rev-ai-stt-vs-soniox-stt.md