How much does GPT-Live-1 cost?

GPT-Live-1 voice sessions cost $0.05 per minute and are billed by the second. Whatever backend model and tools a session calls on for reasoning or actions are charged separately at their normal API rates, so the total price of a call depends on how much work GPT-Live-1 delegates while the conversation runs.

Is GPT-Live-1 available on the free tier?

No. GPT-Live-1 is unsupported on OpenAI's free tier. Paid usage tiers set the concurrency ceiling instead: Tier 1 accounts get 25 concurrent voice sessions and Tier 5 accounts get 500, so the number of simultaneous callers an application can serve rises with its spending tier rather than through a separate quota.

Can GPT-Live-1 call tools during a live conversation?

Yes. GPT-Live-1 supports streaming and function calling, so a conversation can trigger a lookup, a booking or any other function while the caller is still on the line. The model delegates deeper reasoning and actions to the backend models and tools it is paired with rather than doing that work inside the voice layer itself.

What is new compared with GPT-Live in ChatGPT Voice?

GPT-Live has powered ChatGPT Voice since July 2026; the September 10, 2026 release makes the model reachable as gpt-live-1 through the OpenAI API, with published per-minute pricing and per-tier concurrency limits. Developers can now put the same full-duplex voice layer into their own products instead of only hearing it inside ChatGPT.

OpenAI · 2026-09-10 · major

GPT-Live-1 in the API — full-duplex voice for $0.05 a minute

GPT-Live-1 is now in the OpenAI API. The full-duplex voice model listens and speaks at once, handles interruptions, and hands deeper reasoning to the models and tools you pair it with. Voice sessions cost $0.05 per minute.

OpenAI announcement graphic for GPT-Live-1 in the API

OpenAI's full-duplex voice model reaches the API, so any app can listen and talk at the same time.

Quick facts

Maker	OpenAI
Model ID	gpt-live-1
Input / output	Audio and text, both directions
Knowledge cutoff	July 31, 2025
Concurrent sessions	25 (Tier 1) to 500 (Tier 5)
Free tier	Not supported
Availability	OpenAI API, from September 10, 2026

Pricing

Voice session · Billed per second	$0.05 / minute
Backend model and tools · Charged separately	Standard API rates

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What is it?

GPT-Live-1 arrived in the OpenAI API on September 10, 2026, after powering ChatGPT Voice since July. The model takes audio or text in and returns audio or text out, and it is built for conversations where both sides can speak at once instead of strictly taking turns.

How does it work?

Full duplex means the model keeps listening while it is still speaking, so a caller can cut in mid-sentence and the reply stops and adapts. Heavy thinking does not happen in the voice layer: GPT-Live-1 delegates reasoning and actions to the backend models and tools it is paired with, and supports streaming plus function calling so a live conversation can trigger real work. Its knowledge cutoff is July 31, 2025.

Why does it matter?

Voice agents have felt stiff because turn-taking models make a caller wait for a whole reply before interrupting. A metered per-minute price puts a conversational layer within reach of support lines, tutors and phone assistants that need to cost out a call, and the per-tier concurrency ceiling tells them how many people they can serve at once before upgrading.

Who is it for?

teams building voice agents

Frequently asked questions

How much does GPT-Live-1 cost?: GPT-Live-1 voice sessions cost $0.05 per minute and are billed by the second. Whatever backend model and tools a session calls on for reasoning or actions are charged separately at their normal API rates, so the total price of a call depends on how much work GPT-Live-1 delegates while the conversation runs.
Is GPT-Live-1 available on the free tier?: No. GPT-Live-1 is unsupported on OpenAI's free tier. Paid usage tiers set the concurrency ceiling instead: Tier 1 accounts get 25 concurrent voice sessions and Tier 5 accounts get 500, so the number of simultaneous callers an application can serve rises with its spending tier rather than through a separate quota.
Can GPT-Live-1 call tools during a live conversation?: Yes. GPT-Live-1 supports streaming and function calling, so a conversation can trigger a lookup, a booking or any other function while the caller is still on the line. The model delegates deeper reasoning and actions to the backend models and tools it is paired with rather than doing that work inside the voice layer itself.
What is new compared with GPT-Live in ChatGPT Voice?: GPT-Live has powered ChatGPT Voice since July 2026; the September 10, 2026 release makes the model reachable as gpt-live-1 through the OpenAI API, with published per-minute pricing and per-tier concurrency limits. Developers can now put the same full-duplex voice layer into their own products instead of only hearing it inside ChatGPT.

Try it

Model id: gpt-live-1