Trusted by 10K+ Customers
Speed and quality
With a time-to-first-audio of 90ms, Sonic is the fastest generative voice model—with best in class quality and controllability.
Blazing Fast
Built for streaming using our first-of-its-kind low-latency state space model stack.
Controllable
Fine-grained control over pitch, speed, emotion, and pronunciation.
Highest Quality
Sonic ranks #1 in quality in independent evaluations of quality.
Make your content accessible to a global audience.
Sonic supports seamless speech in 13 languages, with more added every release.
15 Languages
From Japanese to German—any language you need, we’ve got it.
Localization
Localize a given voice to any accent or language.
Instantly clone a voice from a 5 second clip. Scale up to hours of data with Fine-Tuning.
Source
Clone
What our customers say
Join the growing list of companies opting for Sonic.
“Cartesia ships features quicker than any team I know. And their voices work—one of our healthcare customers reported that their patients were 4x more likely to stay on a call after switching to Cartesia’s voices compared to their previous text-to-speech provider.
Nikhil Gupta, CTO
“Cartesia hit the mark perfectly. Their voices are incredibly expressive, and you can customize them to your heart's content. The emphasis on low latency makes them the perfect partner for real-time, interactive content. It’s a game-changer for our creators.
Michael Lingelbach, CEO
“Voice quality and low latency generation are critical for our agents, which serve small businesses. Cartesia has set the new industry standard for voice. It's remarkable what they have delivered and the velocity of improvements.
Bob Summers, CEO
