Cartesia
cartesia.ai- Category
- AI Tools
- Rank
- No. 1328Tools index
- Platform
- web
- Type
- TOOL
- Added
- Aug 16, 2026
About
Cartesia offers Sonic-3.5 (text-to-speech) and Ink-2 (speech-to-text) models built on state space model architectures for low-latency, long-context voice AI, along with Line, a platform for building enterprise voice agents. The company reports top rankings on the Artificial Analysis Speech and Speech-to-Text leaderboards and supports cloud, on-premise, and on-device deployment.
What it can do
Convert text to speech
Text → Audio speech
Convert speech to text
Audio speech → Text transcript
Why it made the leaderboard
Sonic-3.5 and Ink-2 use state space models to deliver sub-100ms streaming speech synthesis and transcription, which is the practical difference between a voice agent that feels conversational and one that lags. On-prem and on-device deployment options make it viable where cloud-only TTS APIs are a non-starter.
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Indexed by a proprietary survey. Corrections welcome.