I just watched OpenAI’s Dev Day, and while everyone’s focused on the shiny new features — like the new ChatGPT App Store, the Agent Kit for building multi-agent systems, and GPT-5 Pro — what stood out to me is what it signals.
This is the moment ChatGPT stopped being a tool you plug into your workflow and started becoming the platform your entire workflow runs on. And that shift changes everything for developers, agencies, and anyone building AI-powered products.