At DevDay 2025, OpenAI unveiled a major shift: ChatGPT is evolving from an assistant into an integrated platform. The event introduced new models, SDKs, agent tooling, and interactive apps — all designed to make developers central to the ecosystem.
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Apps in ChatGPT (Apps SDK preview)
Developers can now build apps that run inside ChatGPT, rendering UI and sharing context with the model. Users will soon be able to call services like Canva or Zillow directly in the chat flow. An app directory and monetization options are planned for later in 2025. -
AgentKit for building production agents
A new toolkit helps developers deploy autonomous AI agents capable of handling workflows, tasks, and multi-step assistant behaviour. -
New and upgraded models
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GPT-5 Pro for advanced reasoning and precision tasks.
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Sora 2 with enhanced video generation, remixing, and personalization.
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Smaller models such as gpt-realtime-mini for voice and gpt-image-1-mini for lightweight image generation.
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Codex updates include deeper integration with collaboration tools and enterprise-grade controls.
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Scaling and usage stats
ChatGPT now serves over 800 million weekly users and the API processes around 6 billion tokens per minute. -
Platform mindset shift
OpenAI is positioning ChatGPT as a host for apps, agents, and integrated services — moving beyond a simple language interface toward a true ecosystem.
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Developers who once focused only on API integration will now need to think in terms of UI, agent logic, and platform distribution. The change signals a new era — your service may need to live inside conversational environments rather than just connect to them.
