# AssemblyAI Speech-to-Text (Universal) vs Speechmatics Speech-to-Text (slim)

> Speechmatics Speech-to-Text has a score of 67.3 (B) against AssemblyAI Speech-to-Text (Universal)'s 67 (B). Both do speech stt. The largest gap is schema & documentation, 30 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/assemblyai-stt-vs-speechmatics-stt.md (~1,800 tokens) · this version ~380 tokens · JSON https://www.anchorterminal.com/compare/assemblyai-stt-vs-speechmatics-stt.json · canonical https://www.anchorterminal.com/compare/assemblyai-stt-vs-speechmatics-stt
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

Speechmatics Speech-to-Text has a score of 67.3 (B) against AssemblyAI Speech-to-Text (Universal)'s 67 (B). Both do speech stt. The largest gap is schema & documentation, 30 points.

- AssemblyAI Speech-to-Text (Universal): B 67, rank #148 of 452 · https://www.anchorterminal.com/tools/assemblyai-stt.min.md
- Speechmatics Speech-to-Text: B 67.3, rank #145 of 452 · https://www.anchorterminal.com/tools/speechmatics-stt.min.md
- Pick AssemblyAI Speech-to-Text (Universal) for schema & documentation (+30), maintenance & community (+5). Pick Speechmatics Speech-to-Text for security & auth (+15).

| Category | AssemblyAI Speech-to-Text (Universal) | Speechmatics Speech-to-Text |
| --- | --- | --- |
| Reliability (16%) | 70 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 95 | 65 |
| Agent ergonomics (13%) | 80 | 80 |
| Security & auth (14%) | 50 | 65 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 80 | 75 |
| Transparency & trust (7%) | 78 | 78 |