← Speech-to-Text 
xAI
Grok STT
Measured 2026-07-03
WER · batch
4.8%
Loudness-normalized best-case; degrades on raw input.
WER · stream
10.9%
Raw audio, n=31: 15/50 very-quiet FLEURS clips excluded where the model returns no transcript (loudness-sensitive; batch 4.8% is loudness-normalized).
WER · conversational
11.3%
Was 32.9% burst-fed; its live endpointer needs real-time pacing.
Finalize
305ms
p50–p90 · us-east4 · n=30
Time to first token
1.34s
p50–p90 · us-east4
Cost / min
$0.0033
grok-stt streaming at $0.20/hr. REST is $0.0017.
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