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Cartesia

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Ultra-fast voice AI for real-time applications

San Francisco, United States Founded 2023
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NeuronScore 47/100
Total Raised $65M
Valuation $400M
Stage Series a
Team 20-50 since 2023
About Cartesia

Cartesia builds ultra-low-latency voice AI models enabling real-time speech applications that feel natural and responsive. Its Sonic model achieves sub-50ms time-to-first-audio, making it the fastest production TTS API available. Cartesia's state space model (SSM) architecture is more efficient than transformer alternatives, enabling on-device and edge deployment. Backed by a16z and Index Ventures with $65M raised.

NeuronScore Signal quality across funding, news, traction & verification
47 /100
Tracked
Funding momentum
17/30
Active deals
0/10
News
4/12
Traffic
2/8
Verified
17/20
Freshness
0/10
Agent-Ready Score 50/100 · checked May 2, 2026
MCP
Public API
Webhooks
OAuth2
SDK · TS
SDK · Py
SDKs: PythonJavaScript/TypeScript
Alternatives 6 similar All →
FAQ
When was Cartesia founded?
Cartesia was founded in 2023 in San Francisco, United States.
How much funding has Cartesia raised?
Cartesia has raised $65M across 1 rounds — most recently a Series a.
What is Cartesia's valuation?
Most recent disclosed valuation is $400M.
How much does Cartesia cost?
Cartesia pricing: Free. A free trial is available.
Where is Cartesia headquartered?
Cartesia is headquartered in San Francisco, United States.
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