What is ChatGPT Instant Checkout?

Instant Checkout is the name OpenAI gave to ChatGPT's buy button: the one that lets someone finish an order inside the conversation, without opening the store's website. It is not an OpenAI marketplace or a payment gateway of its own, and it is not the same as ChatGPT Shopping, the part of ChatGPT that searches for and compares products. It matters to a store because it is the piece of agentic commerce that has changed the most in a year: what you read about it depends on the date it was written.

How it works

OpenAI introduced it on September 29, 2025. When someone asks a shopping question, ChatGPT shows the most relevant products from across the web, in organic, unsponsored results. If a product supports Instant Checkout, the person taps "Buy", confirms the order, shipping and payment, and buys without leaving the chat. The order, the charge and the shipping are handled by the merchant with its usual systems; ChatGPT acts as the user's agent and just passes information between the two. The merchant pays a small fee on each completed purchase; for the user it is free and does not change the price.⁠^{[1]OpenAI. Buy it in ChatGPT: Instant Checkout and the Agentic Commerce Protocol}

Under the hood it relies on the ACP (Agentic Commerce Protocol), which OpenAI developed with Stripe. The developer documentation asks the store for three flows:⁠^{[2]OpenAI Developers. Key concepts (Agentic Commerce)}

• The product feed. A file with the identifiers, descriptions, prices, stock, images and shipping options, validated with a sample and then sent every day.
• The checkout session. ChatGPT collects the buyer, shipping and payment details, and calls the store's endpoints to create or update the session. The store validates, calculates the shipping options and taxes, analyzes risk, charges with its provider and accepts or rejects the order.
• The delegated payment. OpenAI prepares a single-use payment request, with a maximum amount and an expiry set according to what the person chose, and passes it to the store's payment provider. OpenAI is not the seller (the merchant of record).

The technical specification pins the checkout session down to five endpoints (create, update, complete, cancel and retrieve) and to webhook notices every time the order changes status. The store has to pass conformance tests before it can charge inside ChatGPT.⁠^{[3]OpenAI Developers. Agentic Checkout Spec}

What changed in 2026

On March 24, 2026, OpenAI wrote that the first version of Instant Checkout did not give the flexibility it was after, so it lets merchants use their own checkout process while it concentrates its effort on product discovery. To anyone who wants a deeper integration it offers building an app inside ChatGPT, as Walmart did.⁠^{[4]OpenAI. Powering Product Discovery in ChatGPT} Shopify reflects this in its help: in ChatGPT, the customer finishes the purchase in the store's own checkout, opened in a browser inside the app or in a new tab if they use ChatGPT on the web.⁠^{[5]Shopify Help Center. Selling in ChatGPT (agentic storefronts)}

Instant Checkout has not gone away. The developer documentation says it is currently available to approved partners, with a form to request access,⁠^{[2]OpenAI Developers. Key concepts (Agentic Commerce)} and the help center says ChatGPT may offer the option on some eligible products and merchants.⁠^{[6]OpenAI, Help Center. Shopping with ChatGPT Search} Neither page gives a date for a wider rollout.

On the order of results, OpenAI said in 2025 that having Instant Checkout gave no preference, but that when ranking several merchants selling the same product it counted as one more factor, alongside availability, price, quality and whether the merchant is the primary seller.⁠^{[1]OpenAI. Buy it in ChatGPT: Instant Checkout and the Agentic Commerce Protocol} The current help page lists those factors without mentioning it, and adds that when the "Instant checkout" label is applied, the cheapest option may be left without the best-price label.⁠^{[6]OpenAI, Help Center. Shopping with ChatGPT Search}

On a store

This is what the first call ChatGPT would make to a fictional example coffee maker store would look like, with the structure from the specification: it creates the session with a product and an address, and the store replies with its own calculation. Here it replies that it has no stock left.⁠^{[3]OpenAI Developers. Agentic Checkout Spec}

POST /checkout_sessions
{
  "items": [{ "id": "MOKA-INOX-6", "quantity": 1 }],
  "fulfillment_address": {
    "name": "Jane Example",
    "line_one": "1234 Chat Road",
    "city": "San Francisco",
    "state": "CA",
    "country": "US",
    "postal_code": "94131"
  }
}

{
  "id": "checkout_session_123",
  "status": "not_ready_for_payment",
  "currency": "usd",
  "messages": [
    {
      "type": "error",
      "code": "out_of_stock",
      "path": "$.line_items[0]",
      "content_type": "plain",
      "content": "This product is not available."
    }
  ]
}

The full response also carries the order lines, the shipping options, the totals and the links to the store's terms, which is what ChatGPT shows the buyer.⁠^{[3]OpenAI Developers. Agentic Checkout Spec} What you read in this exchange is who is in charge: ChatGPT asks and the store decides. If the inventory the store answers with does not match the feed, the buyer sees an error at the last step. The feed is the part Clione covers: it builds it from the enriched catalog and uploads it every day to the SFTP account OpenAI gives the merchant; whether the products appear and where is up to OpenAI.

How to check it

1. Ask ChatGPT a customer's question, without your brand, and see whether any product shows the option to pay inside the chat or the "Instant checkout" label. Note the date and country.⁠^{[6]OpenAI, Help Center. Shopping with ChatGPT Search}
2. If you sell on Shopify, remember that in ChatGPT the purchase ends in your own checkout, and check that it works well in a mobile browser inside another app.⁠^{[5]Shopify Help Center. Selling in ChatGPT (agentic storefronts)}
3. If you want payment inside ChatGPT, the route is the request form in the documentation: today it is for approved partners.⁠^{[2]OpenAI Developers. Key concepts (Agentic Commerce)}
4. Ask your payment provider whether it supports the ACP's delegated payments. If you already charge with Stripe, OpenAI says a single line of code is enough; with another processor, you can adopt the protocol's delegated payment specification without changing provider.⁠^{[1]OpenAI. Buy it in ChatGPT: Instant Checkout and the Agentic Commerce Protocol}

Related concept: agentic checkout

Agentic checkout is the general concept: an AI agent completes the payment on a person's behalf. Instant Checkout is one specific way of doing it, OpenAI's, in which the payment is completed inside ChatGPT and the store charges behind the scenes.⁠^{[2]OpenAI Developers. Key concepts (Agentic Commerce)} In May 2025 Google announced another way for Google AI Mode: you track a product's price, confirm the details and Google adds the item to the cart on the store's website and completes the payment with Google Pay, announced for the United States.⁠^{[7]Google, The Keyword (May 20, 2025). Shop with AI Mode, use AI to buy and try clothes on yourself virtually} The concept is the same; where the payment happens is not.

To keep going, the ACP (Agentic Commerce Protocol) explains the protocol underneath and the agentic commerce reading path puts the rest of the pieces in order.