← Text-to-Speech

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.

Share this result

Embed the live badge

Speko tts rank
Markdown
[![Speko tts rank](https://benchmarks.speko.ai/badge/tts/soniox-tts-rt-v2.svg)](https://benchmarks.speko.ai/tts/soniox-tts-rt-v2)
HTML
<a href="https://benchmarks.speko.ai/tts/soniox-tts-rt-v2"><img src="https://benchmarks.speko.ai/badge/tts/soniox-tts-rt-v2.svg" alt="Speko tts rank"></a>
URL
https://benchmarks.speko.ai/tts/soniox-tts-rt-v2