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The quickest way to get started with Sonic is by using an integration. If you are using the API directly, check out Cartesia’s client libraries and AI tools. The references section contains complete documentation for all API endpoints and best practices.

Integrations

Build a voice agent

AI tools

Skills for coding agents

Client Libraries

The official Cartesia SDKs

Code examples

Simple scripts using Sonic

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References

Prompting tips

Get natural-sounding output from Sonic with minimal prompt engineering.

Custom Pronunciations

Specify custom pronunciations for words that are hard to get right, like proper nouns or domain-specific terms.

Volume, Speed, and Emotion

Control the speed, volume, and emotion of generated speech.

SSML Tags

Laughter, pauses, and mid-transcript controls

Compare TTS Endpoints

How bytes, SSE, and WebSocket differ for text-to-speech, and when to use each.

Output Format

How to find the right parameters for output audio

Caching Audio for Stock Responses

Pre-generate stock TTS phrases as raw PCM, then interleave them with live WebSocket audio to cut latency and credits

Migrating from Sonic 3 to Sonic 3.5

What's new in Sonic 3.5 and what to know before you switch.

Voices

Instant Voice Clone

Learn how to get the best voice clones from your audio clips

Pro Voice Clone

Create near replica voices by leveraging more of your data

Multilingual Voices

Make a voice sound native in new languages and accents.

Streaming Transcripts

Contexts and Continuations

Generating audio from partial transcripts

Context Flushing and Flush IDs

Separating a continuation into multiple parts

Buffering

Control how text is buffered before speech generation to balance prosody and latency