On Monday, Oct 7, 2025, OpenAI hosted its third annual DevDay at Fort Mason in San Francisco. This is considered its “biggest” developer conference.
CEO Sam Altman opened the event by stating growth figures: over 800million weekly ChatGPT users and 4 million active developers, underscoring the massive scale the company has achieved. Unlike previous events, OpenAI DevDay 2025 was less about raw model capabilities and more about platform ownership, signaling a decisive move to transform ChatGPT from a conversational chatbot into an actual operating system (OS) for agentic and application-based workloads. These announcements consolidate disparate AI tools into a unified, integrated developer stack centered around four core pillars: Apps, Agents, Code, and Multimodal Creativity.
The first major announcement was the launch of the ChatGPT Apps SDK, moving definitely beyond earlier, simpler concepts like plugins and GPTs. OpenAI’s strategy is clear: distribution is the new moat. This new toolkit lets developers build full, interactive apps that run right inside the chat window.
The question is: Why make users leave ChatGPT to use another service? Instead of navigating to an external website to book a light or design a graphic, apps like Expedia, Canva, or Zillow simply pop up and work inside your conversation. This is enabled by the Model Context Protocol (MCP), which ensures the app and the AI constantly share smart context, so the AI always knows what the user is doing.
This move instantly transforms ChatGPT into a “super-app,” giving developers unparalleled access to hundreds of millions of users. They also introduced the Agentic Commerce Protocol (ACP) to make it easy to change users for these in-chat apps.
Building AI agents – those intelligent, automated teammates that handle complex, multi-step jobs that used to be messy and unreliable. AgentKit, now generally available, is the complete, professional platform designed to fix that, making agents reliable and secure enough for major companies.
AgentKit simplifies agent development with four core tools:
OpenAI solidified its position as the ultimate coding partner by moving Codex, its coding, to General Availability (GA). Codex is now powered by a specialized version of the GPT-5-Codex model. This makes it much smarter at complex tasks, like code review and refactoring large projects. It’s now built to work everywhere you code, including new integrations like Slack.
This coding power was paired with two critical model announcements:
The final pillar was the democratization of programmable creativity. The excellent Sora 2 text-to-video model, which creates high-quality, long-form videos with realistic sound, is now available via API access for developers.
This means that high-quality video generation is now a programmable tool, not just a standalone customer product. Developers can integrate this powerful creative engine into their own apps for media, marketing, and entertainment. This will open up countless new possibilities for automatically generated content.
DevDay 2025 created a tightly unified and integrated set of tools. The Apps SDK provides developers with immediate distribution. AgentKit offers easy and reliable control over complex tasks. The new models supply raw intelligence and creative capacity.
The strategic message is powerful: OpenAI isn’t just selling AI smarts anymore. They’ve built the foundational software (the OS) that makes building with AI easier than ever. They’ve removed the biggest headaches so developers can focus only on their unique ideas. The message is clear: the road is built, and the time to ship is officially now.
Content Map 1. Be Clear and Specific 2. Add Relevant Context 3. Use Open-Ended Questions for Explorati 4. Iterative Prompting and Response-Based Refinement 5. Embedding Domain-Specific Context 6. Structured Prompt Engineering 7. Leveraging Follow-Up Questions to Drive Precision At least once, any of us here has asked a question on ChatGPT or Gemini, whether it’s […]
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