Cartesia

Cartesia develops speech AI models and a voice agent platform. Its products are Sonic, a text-to-speech model, Ink, a speech-to-text model, and Managed Agents, a platform for building voice agents that answer and make calls. The models are offered through an API and can be deployed in the cloud, on-premise or on-device.

The website targets developers and enterprises and lists voice agent use cases for financial services, healthcare and government. Pricing is tiered: a free plan, paid plans from $5 to $299 per month, and custom Enterprise plans, with usage measured in credits, agent minutes and telephony minutes.

The company was founded by a team that met as PhDs at the Stanford AI Lab and that invented state space models. The website names Karan Goel as CEO and Albert Gu as Chief Scientist. It lists offices in San Francisco, London and Bangalore, and shows 28 open roles across engineering, research, go-to-market, product and people functions.

Product: Sonic text-to-speech, Ink speech-to-text models and Managed Agents voice agent platform, accessed via API.