← Speech-to-Text 
AssemblyAI
Universal-3.6 Pro
Measured 2026-09-30
Run Universal-3.6 Pro on Speko →One API, every model on this board.
WER · batch
—
WER · streaming
Read speech
3.07%
Conversation
13.75%
Details
Read speech
n=1541 · FLEURS test+dev+train · vendor-direct
0.66pt better than 3.5 Pro on the same clips (95% CI 0.49–0.84).
Conversation
11.7–16.1% · EdAcc n=283 · 60 speakers, 2 passes, 2026-10-01
0.79pt better than 3.5 Pro on the same clips (95% CI 0.03–1.67).
Finalize
505ms
p50–p90 · US East · n=200 · vendor-direct · re-measured 2026-09-30 · ±10%
Time to first token
1.11s
p50–p90 · US East · n=200 · vendor-direct · re-measured 2026-09-30 · ±5%
Cost / min
$0.0075
Universal-3.6 Pro Realtime at $0.45/hr, unchanged from 3.5 Pro. Checked 2026-10-01.
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URL
https://benchmarks.speko.ai/stt/assemblyai-universal-3-6-pro