OpenAI has redefined what ChatGPT can be. At Dev Day 2025, the company announced a sweeping lineup of upgrades that officially transforms ChatGPT from a conversational tool into a complete AI platform — with apps, agents, and APIs built directly into its core experience.
The Big Picture
ChatGPT is now more than a chat window — it’s an intelligent hub for interacting with the web and third-party services in real time.
• Apps inside ChatGPT: Users can now run, chat with, and even build apps directly inside ChatGPT using the new Apps SDK.
• Launch partners: Big names like Booking, Canva, Coursera, Figma, Expedia, Spotify, and Zillow are live from day one. Another wave — including Uber, DoorDash, and Tripadvisor — will join later this year.
• Smart suggestions: ChatGPT will automatically recommend relevant apps during your conversation. Searching for an apartment? Zillow opens right in chat. Planning a trip? Expedia or Booking appear automatically.
• Seamless experience: You can now browse listings, play music, or take a course — all without leaving ChatGPT.
For Developers
OpenAI is also opening the doors for developers with a robust new toolkit.
• Apps SDK Preview: Developers can now build and test apps powered by web tech via the Model Context Protocol (MCP) — the same system that powers ChatGPT’s internal apps.
• AgentKit Suite: A full set of tools for creating autonomous agents:
– Agent Builder: A no-code visual tool for designing agent workflows.
– ChatKit: Embed AI agents directly into your products.
– Evaluation and Scaling Tools: Built-in analytics, connectors, and deployment support.
• GPT-5 Codex: Now generally available, including a new Slack integration, Codex SDK, and enterprise-grade access controls.
• APIs for GPT-5 Pro & Sora 2: Developers get access to GPT-5 Pro for reasoning and Sora 2 / Sora 2 Pro for high-quality video generation (up to 15 seconds at 1080p, priced between $0.10–0.50 per second).
• Lightweight Models: OpenAI introduced gpt-realtime-mini and gpt-image-mini, cutting production costs by 70%+, enabling faster and cheaper integrations.
Why It Matters
OpenAI is positioning ChatGPT as the next generation of the web interface — a hybrid between a browser, app store, and operating system powered entirely by AI. Instead of jumping between websites, users can now summon the right tools directly in conversation, blending chat, apps, and automation into one seamless experience.
For developers, AgentKit signals a direct challenge to platforms like Zapier, n8n, and Lindy, giving them an integrated way to create AI-driven workflows and assistants that live inside ChatGPT or connect to external apps.
Meanwhile, the Sora 2 API brings powerful video generation to third-party developers for the first time, expanding OpenAI’s reach into creative and entertainment industries.
The Real Story
ChatGPT is no longer just a chatbot — it’s becoming an AI operating system for the internet. Apps, agents, and APIs will now live where users already spend their time: in the chat itself.
🔗 Explore updates: https://openai.com/dev-day
Key Takeaways
Apps SDK turns ChatGPT into an AI app platform. AgentKit enables developers to build and deploy custom AI agents. GPT-5 Pro and Sora 2 APIs expand reasoning and video capabilities. Mini models dramatically reduce AI production costs. ChatGPT evolves from a chat tool into a full workflow environment.
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