OpenAI launches GPT‑Live‑1 in the API, bringing ChatGPT's full-duplex voice to developers

Build more natural voice experiences with GPT‑Live‑1 in the API

GPT‑Live‑1 is a single-model full-duplex voice API that listens and speaks simultaneously, previously only in ChatGPT. It replaces chained STT–LLM–TTS pipelines; early tests by Speak cut interruptions by nearly 80%. Developers can pair it with backend models like Luna for simple tasks or GPT‑6 Astra for complex reasoning. It scores 30 percentage points higher than GPT‑Realtime‑2.1 on Full Duplex Bench and ranks #1 on Tau3 when backed by Astra. Pricing is not disclosed in the post.

Why it matters: OpenAI opens ChatGPT's full-duplex voice model to the API, collapsing the serial STT→LLM→TTS pipeline into one model — a directly usable update for voice product teams. Speak's real-world feedback notes fewer interruptions but longer wait times, so production polish is still n...