Cartesia builds the next generation of AI: interactive intelligence that runs anywhere. Founded by Stanford AI Lab PhDs who pioneered State Space Models, we fuse model innovation, systems engineering, and product design to deliver leading voice AI. Sonic provides ultra-realistic, low-latency text-to-speech. Ink offers the fastest, affordable streaming transcription. Line is a code-first platform for building customizable voice agents, powered by our proprietary models and infrastructure. We ship production-ready capabilities that make voice interfaces instant, reliable, and scalable for teams that want state-of-the-art performance without complexity.