Cartesia

The real-time voice AI platform

Real-time voice AI platform for building voice applications with speech-generation and speech-understanding model APIs, including the Sonic and Ink product lines.

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releasePRIMARY2026-06-15

Cartesia releases Sonic-3.5 and Ink-2 for streaming TTS and STT

Cartesia launched Sonic-3.5 for text-to-speech and Ink-2 for speech-to-text, calling them its new top streaming voice models. The release pairs low-latency voice-agent claims with 42-language support and immediate partner availability.