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.

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Frontier research, deployed in every conversation

Financial services

Fraud detection

Real-time outbound verification calls on suspicious transactions, step-up authentication

Voice agents that improve customer experience, enhance security, and streamline operations across the financial ecosystem.

Voice agents that improve customer experience, enhance security, and streamline operations across the financial ecosystem.

Financial services

Voice agents that improve customer experience, enhance security, and streamline operations across the financial ecosystem.

Join the teams making the switch to Cartesia

Ranked #1

in Speech Arena leaderboard & Speech to Text leaderboard by Artificial Analysis

The full stack for interactive intelligence

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.

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Ink. Speech-to-text →

The fastest and most accurate streaming transcription model

Sonic. Text-to-speech →

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.

Line. Build voice agents →

The fastest, most customizable platform for building and shipping enterprise voice agents, powered by our models.

Pioneering AI research: architectures that learn through interaction

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 AI 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.