ChatGPT: From Chatbot to Application Platform

Users of ChatGPT see it as a conversational agent; a chatbot. You open a text box, type a question, and receive an answer. It's powerful, sometimes remarkably so, but the interaction model is simple: prompt in, response out. That mental model is about to shift dramatically.

The announcements at OpenAI's Dev Day 2025 signal something bigger than incremental improvements. ChatGPT is evolving from an interface into a substrate. From a place where you talk to AI, to a place where you build with AI. The new Apps SDK and AgentKit are turning ChatGPT into a runtime environment for applications and autonomous workflows.