BAD SIGNAL

← News

10 Sep 2026

OpenAI launches GPT-Live-1 in the API

10 Sep 2026: a full-duplex voice model for developers. OpenAI prices the voice layer at $0.05 a minute. Listen and speak at once, take interruptions, and hand reasoning to a backend agent. That is the product.

10 Sep 2026: OpenAI published “Build more natural voice experiences with GPT-Live-1 in the API.” The same day’s API changelog listed gpt-live-1 as generally available on v1/live/sessions.

OpenAI: GPT-Live-1 is a full-duplex voice model. It can listen and speak at the same time. Interruptions are handled in one model, not a chained speech-to-text / LLM / text-to-speech stack.

Price on the launch post and the model card: $0.05 per minute for the front-end voice layer, billed per second. Backend model and tool usage is charged separately.

Developer docs: the voice model can delegate reasoning and tool use to a backend agent — a managed Responses model, or the app’s own agent via client delegation. Interrupting speech does not automatically cancel that backend work.

This is a developer product announcement, not a consumer ChatGPT update. The Speak “almost 80% fewer interruptions” line and the Full Duplex Bench gains are OpenAI’s customer and lab numbers. This desk did not rerun them.

A dated API launch for full-duplex voice, with a public price. The interruption and bench claims stay OpenAI’s.

Sources

Comments

Talk under the story. Stay on the sources. Comment guidelines

Loading discussion…

More