Cartesia vs Rime
Listeners rate Cartesia's Sonic 3.6 above every Rime model.
ServiceNow, Decagon, and Quora run their production voice agents on Cartesia. One model, 44 languages, and voice cloning from 10 seconds of audio.
Voice quality
Listeners rate Sonic 3.6 above every Rime model
- 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 Coda, Rime's highest-rated model, by more than 200 points.
Provider Voice Arena Elo
Higher is better
Accuracy
Sonic 3.6 makes fewer word errors than both Rime models
- Coval transcribes every clip each model generates and compares it with the script, so a lower rate means more of the script is spoken as written.
- Sonic 3.6 misreads fewer words than Coda and Mist v3, so names, numbers, and codes come through as written.
Word error rate
Lower is better
Latency
Sonic 3.6 is faster than Coda at every quartile
- Coval calls each provider's public API and times every request to first audio.
- Every quartile of Coda's spread, Rime's highest-rated model, sits above Sonic 3.6's.
Latency Variation: Distribution of TTFA values
Lower is better
Read the latency measurements
Time to first audio in milliseconds. The box spans the middle 50% of requests; the line marks the median. Whiskers are not absolute minimums or maximums.
- Sonic 3.6: median 307ms; middle 50% 279–351ms; whiskers 206–458ms.
- Coda: median 322ms; middle 50% 296–362ms; whiskers 230–462ms.
Speed
Sonic 3.6 generates twice as fast as Coda
- Artificial Analysis times every model on the board with the same harness, in characters generated per second.
- Sonic 3.6 generates 119.1 characters per second, against 58.3 for Coda, Rime's highest-rated model.
Characters per second
Higher is better
Reasons why companies choose Cartesia over Rime
Human-like naturalness
Intonation, pacing, pronunciation, emotion, and audio quality that drive higher completion rates
Cartesia1276 EloRime1059 EloCoda910 EloMist v2September 2026
Accuracy
Whether names, numbers, and terms come through as written.
Cartesia1.99% word error rateRime4.51% word error rateCoda2.99% word error rateMist v3September 2026
Speed
Headroom over playback, so a long turn never stalls mid-sentence.
Cartesia119.1 characters per secondRime58.3 characters per secondCodaSeptember 2026
Languages
Comprehension and trust across a global customer base.
Cartesia44 languages from one model, with native accentsRime9 languages on Coda, 4 on MistCustom voices
How much audio it takes, and who is allowed to use one.
CartesiaInstant clone from 10 seconds, self-serve on the public APIRimeManaged clones from 30 to 60 minutes of recordings, most often ready in under seven business days
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 Rime models on the board, Coda and Mist v2.
How accurately does Cartesia read names and numbers?
Sonic 3.6 has a 1.99% word error rate in Coval's independent testing, against 4.51% for Rime Coda and 2.99% for Mist v3. Coval transcribes each generated clip and compares it with the script.
How many languages does Cartesia support?
44 languages from one model, including English, Spanish, French, German, and Japanese. Rime's documentation lists 9 languages for Coda and 4 for Mist.
Can I use my own voice with Cartesia?
Yes. An instant clone takes 10 seconds of audio and a professional clone takes 30 minutes, both self-serve on the public API. Rime builds clones as a managed service from 30 to 60 minutes of recordings.
How long does it take to switch from Rime?
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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