xAI Grok
grok-tts
Measured 2026-07-03
Run grok-tts on Speko →One API, every model on this board.
Naturalness
1495
Win % · 95% CI
48%
42–55%
Drift
15
Synth p50
272ms
272–325 p50–p90
Robustness
0.45
Fined:
• fatal · currency — dropped the minus sign (7 of 7 transcripts)
→ we sent “Your balance is -$1,204.50 as of today.”
→ it said “Your balance is $1,204.50 as of today.”
• fatal · dates — never said “friday” or “sunday” (20 of 43 transcripts)
→ we sent “The fair runs Fri–Sun, Oct 9–11.”
→ it said “The fair runs Fri to Sun, Oct ninth to eleventh.”
• fatal · decimals — dropped the minus sign (1 of 7 transcripts)
→ we sent “Growth slowed to -0.5% this month.”
→ it said “Growth slowed to 0.5% this month.”
+ 3 more fined
Cost / 1M chars
$15.0
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