Listeners rate Cartesia's Sonic 3.6 above both Mistral Voxtral models.
ServiceNow, Decagon, and Quora run their production voice agents on Cartesia. One model, 44 languages, and voice cloning on the public API.
Voice quality
Listeners rate Sonic 3.6 above both Voxtral models
- Artificial Analysis plays listeners two clips of the same line without naming the model, and rates every model on the board the same way.
- Sonic 3.6 leads Voxtral 3 TTS, Mistral's newest model, by more than 70 points.
Provider Voice Arena Elo
Higher is better
Speed
Sonic 3.6 generates speech nearly twice as fast as Voxtral TTS
- Artificial Analysis times every model on the board with the same harness, in characters generated per second.
- Generating well ahead of playback keeps a long turn from stalling mid-sentence.
Characters per second
Higher is better
Reasons why companies choose Cartesia over Mistral
Human-like naturalness
Intonation, pacing, pronunciation, emotion, and audio quality that drive higher completion rates
Cartesia1291 EloMistral1218 EloVoxtral 3 TTS1091 EloVoxtral TTSOctober 2026
Languages
Comprehension and trust across a global customer base.
Cartesia44 languages from one model, with native accentsMistral9 languages on Voxtral 3 TTS
Frequently asked questions
How is the quality score measured?
It comes from Artificial Analysis, an independent benchmark. Listeners hear two clips of the same line without being told which model produced either, and pick the one they prefer. Sonic 3.6 rates above both Mistral models on the board, Voxtral 3 TTS and Voxtral TTS.
Is Voxtral 3 TTS the same model as Voxtral TTS 3?
Yes. Mistral's documentation calls its newest text to speech model Voxtral TTS 3, and Artificial Analysis lists it as Voxtral 3 TTS. Voxtral TTS is the earlier model, released in March 2026. Sonic 3.6 rates above both.
How many languages does Cartesia support?
44 languages from one model, including English, Spanish, French, German, and Japanese. Accents are calibrated per region rather than bolted onto an English model. Mistral lists 9 languages for Voxtral TTS 3.
How long does it take to switch from Mistral Voxtral?
One to two weeks for most teams. Cartesia is integrated into the major voice agent platforms and every model is on the public API, so there is no platform to move onto and nothing to unpick later.
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