OpenAI DevDay 2025 Unveils GPT-5 Pro API and Chat-Embedded Apps
OpenAI announces GPT-5 Pro, AgentKit, and a new Apps SDK that lets third-party software run directly inside ChatGPT conversations. The event focuses heavily on ecosystem integration over pushing new AI frontiers.
OpenAI hosts DevDay 2025 and introduces several major updates, including the GPT-5 Pro API, Sora 2, and a new tool called AgentKit. The central theme of the event focuses on transforming ChatGPT from a simple chatbot into a dynamic platform where third-party software runs, collaborates, and sells directly inside the conversation. Through a preview of the new Apps SDK, external applications now render interactive user interfaces directly in the chat thread and share context using the Model Context Protocol.
Live demonstrations show users designing posters with Canva and exploring Zillow maps without ever leaving their ChatGPT session. Major partners such as Booking.com, Figma, Spotify, and Expedia showcase integrated experiences during the keynote. OpenAI plans to launch an app directory with a submission review process soon, and it promises to release an open implementation of the host environment so that any compatible client can run these embedded applications.
Developer reactions to the announcements remain mixed, with many noting the event feels incremental rather than revolutionary. Observers point out that OpenAI bets heavily on ecosystem integration and cloud-based agents, while competitors like Anthropic continue to lead in enterprise usage and code quality. Anthropic currently commands 32 percent of enterprise LLM usage compared to OpenAI's 25 percent, and Claude holds a dominant 42 percent market share in coding applications versus OpenAI's 21 percent.