Soniox
tts-rt-v2
Measured 2026-08-13
Run tts-rt-v2 on Speko →One API, every model on this board.
Naturalness
1606
Win % · 95% CI
—
Drift
18
Synth p50
381ms
381–417 p50–p90
Robustness
0.49
Fined:
• fatal · dates — never said “sunday” (44 of 49 transcripts)
→ we sent “The fair runs Fri–Sun, Oct 9–11.”
→ it said “The fair runs Friday to Sun, October ninth to eleventh.”
• fatal · large numbers — never said “three trillion” (48 of 49 transcripts)
→ we sent “National debt passed 3,000,000,000,000 dollars.”
→ it said “National debt passed $3 billion.”
• minor · currency · promptable — kept the value but never said “ninety nine cent” (49 of 49 transcripts)
→ we sent “Prices start at 99¢ each.”
→ it said “Prices start at ninety nine three each.”
+ 7 more fined
Cost / 1M chars
$13.0
Token-billed: $4/1M text in, $21.50/1M audio out; vendor-stated ~$0.70 per hour of speech (soniox.com/pricing). At 900 chars/min (54,000 chars/hour) that is ~$13 per 1M chars. Same rates as v1, which the pricing page no longer lists.
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