Cartesia (Sonic)
Cartesia class B live
Ultra-low-latency streaming TTS (Sonic) built for voice agents; instant cloning, multilingual; #2 on Artificial Analysis Speech Arena.
Layer 1 — factual axes
| API & price | public · credit-based (~$50/1M chars) | secondary | source ↗ 2026-07-04 |
|---|---|---|---|
| Voices | not published | unverified | — |
| Voice cloning | yes · instant | secondary | source ↗ 2026-07-04 |
| Languages | 42 | secondary | source ↗ 2026-07-04 |
| Weights | closed | official | source ↗ 2026-07-04 |
| Free tier | limited | official | source ↗ 2026-07-04 |
Layer 2 — output quality
1209 / 1600
Ultra-low-latency streaming TTS (Sonic) built for voice agents; instant cloning, multilingual; #2 on Artificial Analysis Speech Arena.