← Text-to-Speech

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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