AssemblyAI vs Speechmatics
AssemblyAI Universal-3 Pro vs Speechmatics Enhanced for transcription. WER: 3.1% vs 4% — edge AssemblyAI Langs: 99 vs 70 — edge AssemblyAI Latency: 150 ms vs 500 ms — edge AssemblyAI Computed from public benchmarks with dated sources; updated 2026-08-20.
Head to head
| Axis | AssemblyAI Universal-3 Pro | Speechmatics Enhanced | Edge |
|---|---|---|---|
| Price | $3.5 per 1000 min | —* | — |
| WER | 3.1% | 4% | AssemblyAI |
| Langs | 99 | 70 | AssemblyAI |
| Latency | 150 ms | 500 ms | AssemblyAI |
| diarization | ✓ | ✓ | — |
| timestamps | ✓ | ✓ | — |
| vocab | ✓ | ✓ | — |
* token-/credit-priced — the headline understates real per-unit cost, so no price edge is awarded.
Strengths & caveats
AssemblyAICheapest of the directly-comparable dedicated APIs ($3.50/1000 min) with the widest language coverage (99) and full diarization, timestamps and custom vocabulary; ~150 ms P50 streaming. Accuracy (3.1% WER) trails the leaders; the cheaper legacy Universal-2 tier is less accurate still. AssemblyAI now lists Universal-3.5 Pro as its flagship at the same $3.50/1000 min, but no independent leaderboard score exists for it yet, so the WER here still refers to Universal-3 Pro.SpeechmaticsLong-standing broad multilingual coverage (~70 languages) with diarization, timestamps and a custom dictionary. Vendor no longer publishes per-model rates (the pricing page defers to a portal), so the June 2026 $6.70/1000 min could not be re-verified and third-party figures conflict up to 2-3x higher; the price is therefore marked not comparable. Mid-pack accuracy (4.0% WER).
Sources
- Artificial Analysis — Speech to Text2026-08-20
- Open ASR Leaderboard2026-06-19