Cartesia builds real-time voice AI infrastructure for conversational agents, anchored on state space model (SSM) research from co-founder Albert Gu (the author of Mamba) and Karan Goel. The company's Sonic-3 model targets sub-100ms latency at production scale, putting it head-to-head with ElevenLabs in the booming voice-agent market. Cartesia raised $100M in late 2025 led by Kleiner Perkins to expand into enterprise voice agents and ship lower-latency turn-taking.

Company Profile

Founders & Key People

Investors

Products

• Sonic-3 (TTS)
• Sonic Turbo (low-latency voice)
• Voice cloning
• Real-time voice agents API
• Speech-to-speech models

Competitors

AIVoiceInfrastructure APIState Space Models

Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of 2025-Q4. Refreshed quarterly.