OpenAI unveiled its Apps SDK at the October 6 DevDay event, allowing developers to integrate applications directly into ChatGPT. The SDK, based on the Model Context Protocol (MCP), enables in-app interactions with services from partners like Booking.com and Spotify. OpenAI plans to accept app submissions later this year. Yuchen Jin, co-founder of Hyperbolic apps, called the move "genius," anticipating ChatGPT's evolution into a dominant app platform. The technology is expected to redefine user engagement.