Cartesia has shipped Sonic 3.5, a text-to-speech (TTS) model, and Ink 2, a streaming speech-to-text (STT) model, both built for voice agents and offered together as a single real-time voice stack. The setup pairs Ink 2 for transcription and Sonic 3.5 for speech generation under one provider API, which the company frames on its official site as the "#1 real-time speech and transcription models purpose-built for voice agents."
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