← Speech-to-Text 
AssemblyAI
Universal-3.5 Pro
Measured 2026-07-03
WER · batch
2.0%
WER · stream
2.0%
WER · conversational
10.4%
Best substitution rate on the board at 4.1% -- it hears better than anything here and loses on emission, carrying 4.9% deletions.
Finalize
66ms
p50–p90 · us-east4 · n=30
Time to first token
1.32s
p50–p90 · us-east4
Cost / min
$0.0075
Universal-3.5 Pro Realtime at $0.45/hr. Async pre-recorded is $0.0035. Diarization and other add-ons bill on top.
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