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.
OpenAI has officially opened the doors to a new developer ecosystem for ChatGPT, introducing in-chat applications and a developer SDK that allows third-party tools and services to integrate directly ...
ChatGPT's maker also unveiled a drag-and-drop platform for building AI agents at DevDay 2025, but the polish comes with strings attached.