Cartesia vs Bland
Listeners rate Cartesia's Sonic 3.6 above Bland's voice model.
ServiceNow, Decagon, and Quora run their production voice agents on Cartesia. One model, 44 languages, first audio in under 90ms.
Voice quality
Listeners rate Sonic 3.6 above Bland TTS
- 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 Bland TTS by 240 points.
Provider Voice Arena Elo
Higher is better
Speed
Sonic 3.6 generates speech twice as fast as Bland TTS
- 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 59.9 for Bland TTS.
Characters per second
Higher is better
Reasons why companies choose Cartesia over Bland
Human-like naturalness
Intonation, pacing, pronunciation, emotion, and audio quality that drive higher completion rates
Cartesia1276 EloBland1036 EloSeptember 2026
Speed
Headroom over playback, so a long turn never stalls mid-sentence.
Cartesia119.1 characters per secondBland59.9 characters per secondSeptember 2026
Latency
Decides whether it feels like a conversation or a phone tree.
CartesiaUnder 90ms to first audioBland199ms to first audio, Bland's published figure
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 Bland TTS, the model behind Bland's voice agents.
How fast is Cartesia compared with Bland?
Sonic 3.6 returns first audio in under 90ms, where Bland publishes 199ms for its speech model. On Artificial Analysis, Sonic 3.6 generates 119.1 characters per second against 59.9 for Bland TTS.
Can I keep my agent stack and switch only the voice?
Yes. Sonic is a standalone speech API, so it drops into the major voice agent platforms alongside the language model and transcription you already run.
How long does it take to switch from Bland?
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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