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The SDK is built on the open source Model Context Protocol (MCP), Altman said. That means developers that already use MCP only need to add an HTML resource to enable ChatGPT integration, he added.

Learn how to build custom apps in ChatGPT with OpenAI’s Apps SDK and MCP. Step-by-step guide for developers and AI enthusiasts of all ages ...

At OpenAI’s Developer Day, CEO Sam Altman showed off apps that run entirely inside the chat window—a new effort to turn ChatGPT into a platform.