# Cartesia - Real-time TTS API with AI laughter and emotion

> Integrate real-time text-to-speech with natural, expressive voices in 44 languages.

- Website: https://cartesia.ai/sonic
- Category: [Voice AI](/category/voice-ai/index.md)
- Added: 2026-10-01
- Updated: 2026-10-01
- Curated by: Harsh Chhajer
- Page: /resources/cartesia-real-time-tts-api-with-ai-laughter-and-emotion/

## Experience Natural Speech

You can generate natural, expressive voices with Cartesia's Sonic-3.6 model, which is ranked #1 for naturalness. It offers sub-90ms latency and is natively multilingual across 44 languages for your applications.

## Built For Voice Agents

Sonic provides seven capabilities that voice agents rely on, including naturalness, reliability, speed, scalability, multilingual support, consistency, and cost-effectiveness. These features help you create production-ready voice layers.

## Customize Your Voice Output

You can clone any voice and localize it into 44 languages, fine-tuning every word for your specific needs. Sonic automatically interprets emotional subtext and allows you to insert non-verbal expressions like laughter.