Cartesia packages Sonic-3.5 and Ink-2 into a full voice-agent stack
Karan Goel is using benchmark wins to pitch Cartesia as both the speaking and listening layer for real-time AI agents.
By Ryan Merket · Published
Primary source: X
Why it matters
Cartesia is using benchmark wins to argue that voice agents should standardize on one low-latency speech stack, not stitched-together TTS and STT vendors.
Karan Goel (@krandiash) is turning Cartesia's May model releases into a broader platform push: Sonic-3.5 for text-to-speech, Ink-2 for speech-to-text, and a claim that Cartesia can now own both sides of the live voice-agent loop.
"We're now the only provider to have #1 models for both speaking and listening," Goel wrote in a post on X on Monday, June 15th.…