Introducing GPT-Live-1 in the API

Announcements
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GPT-Live-1 brings ChatGPT’s natural, full-duplex voice conversations to the API. It listens and speaks simultaneously, handles pauses, interruptions, and backchannels, and adapts when a conversation changes direction.

The model manages the live conversation while delegating deeper reasoning and actions to your choice of backend model, tools, or agent framework.

Performance on real tasks

Paired with GPT-6 Astra at medium reasoning effort, GPT-Live-1 completed 83.6% of Tau3 tasks on the first attempt, versus 45.7% for GPT-Realtime-2.1. Tau3 covers airline, retail, and telecom support.

The same pairing scored 38.1% on TauBanking, which tests document retrieval and account-tool use.

Additional benchmark results

  • 97.3% on Artificial Analysis’s Conversational Dynamics benchmark.

  • 80.1% on Full Duplex Bench v1.5 interactivity.

  • 0.798-second turn-taking latency, compared with 1.41 seconds for GPT-Realtime-2.1.

  • 87% tool-calling success and 90% response quality on separate Full Duplex Bench v3 evaluations.

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Voices and production features

GPT-Live-1 adds 12 real-time voices:

Quartz · Ripple · Vesper · Willow · Stone · Gleam · Meridian · Bossa · Tempo · Beacon · Delta · Cinder

The expanded selection covers more accents, dialects, and languages. System prompts can shape tone, pace, speaking style, and conversational behavior.

Listen to the new voices

For production applications, the model provides native ASR transcripts and response text, keyword biasing, explicit turn detection, and improved handling of silence and background noise.

Connect using WebRTC for browsers, WebSockets for server-side audio, or Telephony and SIP for phone agents.

Delegation and Codex

Use managed Responses delegation or connect an existing model, agent, or service through client delegation. Your application controls permissions and durable task state; interrupting speech does not automatically cancel backend work.

You can also pair GPT-Live-1 with the Codex SDK. Your app passes conversation context to a Codex thread and returns the result to the active voice session, allowing Codex to investigate a repository or complete delegated work while the conversation continues.

See the GPT-Live-1 and Codex integration

Pricing

Voice sessions cost $0.05 per minute, billed per second. Backend model and tool usage is billed separately.

Read the launch post · Get started with GPT-Live

Building with GPT-Live-1? Share what you learn about interruptions, delegation, and production tool use.

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OpenAI has released full duplex GPT-Live-1 on the API with pricing at 5c/minute. As someone who loves building voice assistants, this is very exciting (full duplex models are amazing).

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There are hints in the announcement: “GPT Live backend: Astra (medium).”

Multimodal finally powered by a newer underlying model than training of gpt-4o?

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@platypus out of interest, are you using a telco?

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No just self hosting on my home server and connecting via WebRTC. I’ve only been using local models so far (tried ElevenLabs and some other services in the past but I can get very similar quality with Fish Audio hosted at home, with unlimited speaking time). BUT…it aint full duplex :wink:

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O que está faltando é esse Canal de Voz conseguir executar as Ferramentas e Pluings como o chat normal.