Meet Sonic-3.5 and Ink-2.
The #1 real-time speech and transcription models purpose-built for voice agents. One API, no tradeoffs between quality and speed.
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Architecting AI that learns and interacts like humans
Today's AI learns from data curated by humans. We're building AI that learns from the world as it is, and gets better with every interaction.
in Speech Arena leaderboard & Speech to Text leaderboard by Artificial Analysis
The full stack for interactive intelligence
Try CartesiaThe fastest models you can trust.
Our models are designed for live, synchronous interactions, built on State Space Models (SSMs). A new primitive for large-scale foundation models, SSMs deliver ultra-low latency, long-context reasoning, and greater efficiency at scale.
The fastest and most accurate streaming transcription model
The fastest and most realistic speech generation model
Voice agents as fast and accurate as the models powering them
Our voice agents are designed for live, synchronous interactions, built on our Sonic and Ink models. Enterprise-grade from the ground up, they integrate with your existing systems, handle complex conversations, and deploy at any scale.
Our team has pioneered breakthrough AI architectures, including state space models (SSMs), Mamba & H-Nets. Our research manifests our mission — we architect AI that learns from and interacts with the world like humans do.
Our research
Deploy anywhere.
Own it everywhere.
The same models and agents across cloud, on-premise, and on-device. Inference runs in-region — keeping you within your latency envelope, data residency obligations, and compliance frameworks.
Deploy via regional API endpoints across the globe — ensuring in-region processing, high availability, and the uptime your production systems demand.
Deploy in your VPC, on your own hardware, or directly in your customer's environment — with complete ownership and control over every layer of your deployment.
Deploy at the edge, directly on-device across mobile, PC, robotics, and beyond. Your data stays where it lives — fully private, instantly accessible, and always on.
Talk to an expert. Connect with a member of our team and learn how Cartesia can help you build world-class voice experiences.
Start building. Access our models via API and bring an agent into production with our robust SDKs and developer tools.