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Sonic

The best API for real-time, interactive voice.

The fastest, ultra-realistic generative voice API.

Try it out Read the Docs

Trusted By

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.

German

English

Spanish

French

Japanese

Portuguese

Chinese

Lifelike, expressive voices
for every use case.

Support

Power support experiences that make customers happy.

Gaming

Bring your storytelling to life with immersive voices.

Content

Create content that engages viewers and drives clicks.

Media

Narrate content for podcasts, news, and publishing.

Healthcare

Empower care with voices that patients trust.

Sales

Scale sales with lifelike voices that lead to conversions.

Voice Agents

Build responsive AI voice agents for any use case.

Dubbing

Go global with localized voices and accents.

Avatars

Make AI avatars talk for any use case.

Logistics

Automate logistics with voice-enabled systems.

Recruiting

Screen candidates with AI-powered voice interviews.

Accessibility

Make your content accessible to everyone.

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.

Try it out Talk to Sales

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