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Sonic

The best API for real-time, interactive voice.

The fastest, ultra-realistic generative voice API.

Powered by our next-gen state space model.
Purpose-built for developers.

Try it outRead the Docs
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Trusted By
VAPI logoTavus logoHedra logoDaily logoGoodcall logoLiveKit logoQuora logoMercor logoAssort Health logo

Speed and quality. Pick two.

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 inference stack.

Controllable

Fine-grained control over pitch, speed, emotion, and pronunciation.

Clone a voice with as little as 15 seconds of audio.

And scale up to hours of speaker data for exact-fidelity voice cloning.

Source Audio

Clone

Voices from around the world.

Make your content accessible to a global audience with Sonic Multilingual.

GermanGerman
EnglishEnglish
SpanishSpanish
FrenchFrench
JapaneseJapanese
PortuguesePortuguese
ChineseChinese

Lifelike, expressive voices
for every use case.

Sonic for Support

Real-Time Response

90ms time to first audio across every language

Realistic Voices

Engage customers naturally like a human

Built to Scale

Unlimited concurrency for traffic peaks

Accurate Pronunciations

Get phone numbers and payment info right

What our customers are saying

Join the growing list of companies opting for Sonic.

Customer logo
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

Customer logo
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

Customer logo
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