OpenAI brings GPT-Live-1 voice model to its API for developers

OpenAI has opened API access to GPT-Live-1, a voice model that can listen and speak simultaneously and hand off complex reasoning or tool use to text models like GPT-6 Astra. The model, already used in ChatGPT, lets developers customize tone and pacing, handle background noise, and support full-duplex phone-based voice agents. Early testing by language-learning company Speak found it cut conversational interruptions by nearly 80% compared with older turn-based voice systems.