Cartesia
Free tierArchitecting AI that learns and interacts like humans — ultra-low latency voice AI
Key strengths
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Recent changes
- Models updated: Cartesia (proprietary — Sonic for TTS, Ink for STT, built on State Space Models / Mamba / H-Nets)
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Cartesia — Technical Overview
Cartesia is a full-stack, real-time voice AI platform built on proprietary State Space Models (SSMs), specifically Mamba and H-Net architectures, which deliver ultra-low latency inference compared to traditional transformer-based approaches. The platform exposes three core capabilities through a unified API:
- Sonic — Text-to-Speech (TTS) model
- Ink — Speech-to-Text (STT) model
- Managed Voice Agents — end-to-end orchestration layer
Cartesia holds the #1 ranking on both the Speech Arena and Speech-to-Text leaderboards. The API supports cloud, on-premise, and on-device deployment, making it suitable for air-gapped or latency-sensitive production environments. Voice cloning and multi-language support are available out of the box. The platform is open-source (421 GitHub stars) and self-hostable. The only listed third-party integration is Slack. Founded in 2024.