Cartesia
Free tierArchitecting AI that learns and interacts like humans — ultra-low latency voice AI
Free tier available·All audiences·Powered by Cartesia (proprietary — Sonic for TTS, Ink for STT, built on State Space Models / Mamba / H-Nets)·API available
Key strengths
#1-ranked real-time voice (Speech Arena & Speech-to-Text leaderboards)Ultra-low latency via State Space Models (SSMs/Mamba/H-Nets)Full-stack: TTS (Sonic), STT (Ink), and Managed Voice Agents in one APICloud, on-premise, and on-device deploymentVoice cloning and multi-language support
Free tier + paid plans
Self-hostable
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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 — Developer Docs & Integration
Cartesia provides a unified API covering TTS (Sonic), STT (Ink), and Managed Voice Agents. Key technical details for integration:
- API available: Yes — single API surface for all three capabilities
- Deployment targets: Cloud (Cartesia-hosted), on-premise, and on-device
- Model architecture: State Space Models (SSMs / Mamba / H-Nets) — proprietary
- Self-hostable: Yes — suitable for regulated or air-gapped environments
- Open-source: Yes (421 GitHub stars)
- Voice agent telephony: $0.06/min for agent calls + $0.014/min for Cartesia-provided phone numbers
- Integrations: Slack
- Voice features: Voice cloning, multi-language support
Developers targeting finance, healthcare, government, or retail verticals can leverage on-premise deployment to meet data residency and compliance requirements.
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