By skyforbes 
It’s Becoming the OS of Thought
The minute I saw the keynote unfold, I felt something shift — not just in tech, but in how we perceive tools.
Dev Day 2025 didn’t just unveil upgrades.
It redefined what “ChatGPT” can be.
What Went Down (In Bullets, Because Why Not)
- Sam Altman revealed: 800 million weekly users, 4 million active developers on OpenAI’s platform.
- ChatGPT will host apps inside the chat interface — you can call tools like Canva, Spotify, Zillow without ever leaving your conversation.
- They launched AgentKit — a visual, guardrail-enabled platform to design, test, ship agents seamlessly.
- Codex got upgrades. Now GPT-5 Pro and Sora 2 are part of the API — your product can now harness them.
- The Apps SDK is open for preview, built on the Model Context Protocol (MCP), enabling external servers / tools to integrate into ChatGPT’s conversation environment.
- The Responses API now supports remote MCP servers — meaning your MCP setup might be accessible.