Audio · Cartesia

Sonic 3

Ultra-low-latency real-time voice model

[ Overview ]

Cartesia's Sonic 3 is a real-time text-to-speech model built for voice agents, claiming roughly 40ms time-to-first-audio, the fastest commercial TTS latency available.

[ Pros ]

Industry-leading latency for voice agents
Multilingual, natural-sounding voices
Strong developer API

[ Cons ]

Character-based credit pricing adds up fast
Voice cloning costs extra

[ Tags ]

text-to-speechreal-timevoice agentsAPI