EVERYTHING OPENAI ANNOUNCED AT DEVDAY 2025

Summary from the TLDR Founders newsletter

OpenAI is transforming ChatGPT from a chatbot into an operating system. The company launched Apps SDK so developers can build actual apps inside ChatGPT instead of just GPTs, meaning you can talk directly to Canva, Zillow, and Coursera without leaving the chat interface. OpenAI also released AgentKit for building agentic workflows with evaluation tools included.