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ChatGPT Instant Checkout is a new capability since 2025 developed by OpenAI that allows users to discover, configure, and purchase products directly within ChatGPT without leaving the conversation.
This functionality is powered by the Agentic Commerce Protocol (ACP), an open standard that defines how merchants’ systems interact with AI agents.
Merchants connect their product catalog through a structured product feed, expose checkout endpoints via the Agentic Checkout API, and process payments securely through delegated payment providers like Stripe.
Together, these layers create a smooth, conversational shopping experience that merges AI discovery with secure e-commerce execution.
Large Language Models (LLMs) are AI systems trained on massive amounts of text data, from websites to books, to understand and generate language.
They use deep learning algorithms, specifically transformer architectures, to model the structure and meaning of language.
LLMs don't "know" facts in the way humans do. Instead, they predict the next word in a sequence using probabilities, based on the context of everything that came before it. This ability enables them to produce fluent and relevant responses across countless topics.
For a deeper look at the mechanics, check out our full blog post: How Large Language Models Work.