Introducing Sonic 2.0 and Sonic Turbo
The fastest, ultra-realistic generative voice AI.
Sonic 2.0
Our most controllable model
Best in class naturalness and voice cloning in blinded human evals
Handles long and complex transcripts correctly in 15 languages
90 ms model latency
Sonic Turbo
Our fastest model
40ms model latency, fastest in market
Supports 15 languages and wide variety of accents
High naturalness and voice quality with support for instant cloning
Double the Speed
Double the Performance
Accurate transcript following
Sonic accurately handles long transcripts and complex transcripts like names, emails, phone numbers, and addresses.
Script: To confirm, your group number is G98221, and your member ID is 554321-AA98. Does that match your card?
"We're thrilled to partner with Cartesia - their technology has dramatically improved the accuracy and reliability of our call center agents. "
Jeffrey Liu, Founder and co-CEO, Assort Health
Natural, conversational voices
Sonic masters the subtle nuances of human speech—including hesitations and filler words—letting you create voice agents that sound authentically human.
A conversational, female voice being used for scheduling a medical appointment
A conversational male voice being used for outbound sales
"Using Cartesia's generative voice API, Sonic, we’ve strengthened Cresta AI Agent to move beyond rigid scripts and towards delivering empathetic, human-like conversations that accurately represent customer brands and their commitment to excellent customer service. Sonic empowers Cresta AI Agent to resolve complex issues effortlessly, helping our customers gain real value from their AI investment and significantly improve their NPS and CSAT scores."
Tim Shi, Co-Founder & Chief Technology Officer at Cresta
15 Languages
Supports 15 languages, with additional languages added in each new release.
Localization
Localize any voice to any language, with fine-grained control over the accent.
What our customers say
Join the growing list of companies opting for Sonic.
"In 1999, Salesforce brought software to the cloud. In 2025, 11x is killing software as we know it and unleashing the era of digital workers. To realise this vision, we needed AI voice technology that feels truly human. Cartesia’s technology gives our AI digital workers reps the speed, reliability, and natural expressiveness required to engage customers at scale.
It's the only solution fit for our relentless drive toward innovation.”
Keith Fearon, Head of Product & Growth, 11x
"This partnership represents a transformative moment in enterprise AI adoption. By combining Rasa’s strengths in enterprise conversational AI with Cartesia's innovative voice technology, we're fundamentally changing how enterprises can deploy and scale AI assistants across their organizations."
Melissa Gordon, CEO of Rasa
"Together AI's mission has always been to provide developers with the most powerful and efficient tools for building AI applications. Cartesia is leading the charge of building efficient, multimodal models from first principles, starting with their Sonic TTS model. By integrating Sonic into our platform, we're enabling developers to create sophisticated multi-modal applications that leverage the most advanced and lowest latency voice model available today, all while maintaining the simplicity and reliability our users expect."
Vipul Ved Prakash, Together AI's CEO
