OpenAI released GPT-Live-1 to its API on September 10 at $0.05 per minute for the front-end voice layer, making available a full-duplex model that handles listening and speaking simultaneously in a single model rather than chaining separate speech-to-text, language, and text-to-speech components.
Developers can pair it with backend models including GPT-6 Astra or third-party options for reasoning and tool calls. Testing with language-learning company Speak showed it "cutting interruptions by almost 80% versus previous turn-based systems," and the model ranks first on the Tau3 voice-agent benchmark when paired with GPT-6 Astra.