Low-latency voice API built for real-time agents and streaming speech
Cartesia is a voice AI company whose Sonic text-to-speech models are built on state-space architectures instead of transformers, a choice aimed squarely at time-to-first-audio. The result is streaming speech quick enough for live phone agents and conversational apps, with emotional control and instant voice cloning from a short sample. Deployment can be cloud, on-premise or on-device for teams that cannot send audio out. It is infrastructure for developers rather than a studio: there is a playground and SDKs, but no timeline editor. Latency numbers should be measured on your own traffic.
Last updated: 2026-09-20. This site only provides an index; for exact features, pricing, and licensing, see the official website.
voice agents, phone support bots, live translation and interactive apps
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The Sonic models use a state-space architecture rather than the transformer design behind most speech models. That approach streams audio with very low time-to-first-audio, which is what makes a spoken exchange feel immediate instead of delayed.
Yes, instant cloning works from a sample of roughly ten seconds, and a higher-fidelity professional clone is available on higher tiers. Consent and local law still govern what you may do with another person's voice.
Not really. There is a playground for testing voices and an API for production, but it is not a video or podcast editing tool. Teams normally pair it with their own front end or agent framework.
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