OpenAI made GPT-Live-1 generally available in the API on September 10, bringing the full-duplex voice conversations from ChatGPT to developers. The model listens and speaks simultaneously — no turn-taking relay — and delegates deeper reasoning and tool calls to a backend text model of the developer's choice (GPT-6 Astra, Terra/Luna, or third-party).

OpenAI's published numbers: 80.1% on Full Duplex Bench v1.5 interactivity and 0.798s turn-taking latency versus 1.41s for GPT-Realtime-2.1; 83.6% on Tau3 customer-service tasks when paired with GPT-6 Astra. Pricing is $0.05 per minute of voice, billed per second, with backend tokens billed separately. Connects via WebRTC, WebSockets, or SIP/telephony.