← Speech-to-Text 
AssemblyAI
Universal-Streaming English
Measured 2026-09-28
Run Universal-Streaming English on Speko →One API, every model on this board.
WER · batch
—
Streaming-only endpoint
WER · streaming
Read speech
7.36%
Conversation
26.19%
Details
Read speech
n=1541 · FLEURS test+dev+train · vendor-direct
5 of 1541 clips came back empty, scored as all-deletion.
Conversation
23.0–29.4% · EdAcc n=283 · 60 speakers, 2 passes, 2026-10-01
14 of 566 readings came back empty, scored as all-deletion.
Finalize
452ms
p50–p90 · US East · n=200 · vendor-direct · ±12%
Time to first token
1.74s
p50–p90 · US East · n=200 · vendor-direct · ±5%
Cost / min
$0.0025
$0.15/hr, billed on WebSocket session duration, idle time included. Checked 2026-09-28.
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URL
https://benchmarks.speko.ai/stt/assemblyai-universal-streaming-english