Product overview
What is Cartesia Sonic?
Cartesia Sonic is a real-time text-to-speech model and streaming API for voice agents and interactive applications. The current Sonic-3.5 product page describes sub-90-millisecond latency and native multilingual speech across more than 40 languages. It is intended for conversations where response speed, consistent pacing, natural delivery, and expressive speech affect the user experience.
Sonic interprets emotional context in the transcript to adjust delivery automatically and supports non-verbal expressions such as laughter. Developers can access the model through APIs, SDKs, and Cartesia's developer tools, with cloud and local deployment options presented for enterprise environments.
Core Features
- Streaming text to speech: Generates audio for real-time applications with sub-90-millisecond latency.
- Expressive delivery: Adjusts tone and pacing from the transcript's emotional context.
- Non-verbal expressions: Supports transcript controls for sounds such as laughter.
- Voice cloning: Creates a cloned voice from ten seconds of reference audio.
- Audio localization: Carries speaker identity, tone, and emotion into 42 languages.
- Pronunciation dictionaries: Defines exact pronunciations for names and domain terminology.
Use Cases
- Customer support agents: Provide low-latency spoken responses for account and service questions.
- Sales and recruiting calls: Power voice workflows that qualify people and capture outcomes.
- Training simulations: Create spoken personas for practice conversations.
- Multilingual applications: Localize voice experiences while preserving speaker characteristics.
- Interactive storytelling: Generate natural, expressive narration in real time.
Frequently Asked Questions
How many languages does Sonic support?
The product page describes native multilingual speech across more than 40 languages and localization into 42 languages.
Can Sonic clone a voice?
Yes. Cartesia says voice cloning can use ten seconds of audio.
Is Sonic available through an API?
Yes. Cartesia provides a streaming TTS API, SDKs, and developer tools.
