OpenAI DevDay 2025: ChatGPT Apps, AgentKit & GPT‑5 Revolution

In the most anticipated AI event of the year, OpenAI DevDay 2025, the company unveiled a major shift in how we interact with ChatGPT and its ecosystem. This blog article dives into the ChatGPT update, OpenAI DevDay 2025 announcements, and what these changes mean for users, developers, and the AI landscape.

Key Announcements from DevDay 2025

1. Apps inside ChatGPT with new Apps SDK

OpenAI introduced an Apps SDK (in preview) that allows developers to build interactive third‑party apps directly inside ChatGPT. Now you can ask ChatGPT to call Spotify, Canva, Zillow, Booking.com, Figma or Coursera from within your chat, without leaving the interface.

2. Introducing AgentKit – Build AI Agents Easily

AgentKit is a new toolkit that helps developers build, deploy, and optimize AI agents. It offers tools like a visual agent builder, guardrails, embedding chat UIs, trace grading, and easier deployment pipelines.

3. Upgraded Models & API Access (GPT‑5 Pro, Sora, Mini models)

OpenAI launched GPT‑5 Pro in the API and cheaper models like gpt‑realtime‑mini and gpt‑image‑1‑mini for more efficient use. The models support advanced reasoning, tool use, prompt caching, and structured outputs.

4. Codex Goes General Availability & Internal Use

Codex, the AI coding assistant, is now generally available for paying users. Sam Altman also revealed that OpenAI uses Codex extensively internally—some internal code is now almost entirely generated by Codex.

Why This Matters

From chatbot to superplatform: ChatGPT is becoming an app platform, letting you embed full services within conversation.
Developer empowerment: With SDKs and AgentKit, building AI tools and agents is more accessible than ever.
Model evolution: GPT‑5 Pro and mini models allow flexible, efficient AI integrations across scale.
AI in the loop: OpenAI’s own reliance on Codex signals how AI is weaving into software development itself.

Conclusion

OpenAI DevDay 2025 marks a pivotal moment in generative AI. The integration of apps, the arrival of AgentKit, and stronger models like GPT‑5 Pro position ChatGPT not just as an assistant but as a full AI platform. For bloggers, developers, and AI enthusiasts, staying aligned with trending keywords and capturing these updates helps you ride the wave of the future of AI.

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