ChatGPT Apps SDK

The official OpenAI toolkit for designing and deploying interactive, custom-UI applications directly within the ChatGPT interface.

This is the core developer kit for building ChatGPT Apps: a new class of interactive experience. The Apps SDK, paired with the Model Context Protocol (MCP), allows you to integrate custom UI components (maps, carousels, forms) and complex workflows directly into the user's chat session. Developers leverage the SDK to define tools, resources, and widgets, enabling conversational access to external services (e.g., Zillow for listings, Canva for design). The result is a dynamic, task-oriented application that runs natively inside ChatGPT, significantly extending its utility beyond text generation.

https://developers.openai.com/apps-sdk/