Every year, OpenAI’s DevDay gives us a peek into what’s next in the world of Artificial Intelligence — and this year’s event (held in San Francisco on Oct 6 2025) didn’t just give a peek, it opened the door wide.
Let’s take you through it in plain English.
A Quick Look Back
In 2023, OpenAI launched the first DevDay and introduced GPT-4 Turbo, Custom GPTs, and APIs that made AI usable for real products.
In 2024, the focus was on speed and real-time interaction — remember when ChatGPT could suddenly talk and see images?
Now, in 2025, Sam Altman and team have made one thing clear:
AI isn’t just a tool anymore — it’s a platform.
ChatGPT Apps Are Here
The biggest announcement?
You can now build apps inside ChatGPT itself.
That means when someone’s chatting, they can discover, open, and use your app — without leaving the conversation.
Imagine you’re chatting and say, “Hey, I want to design a poster.”
ChatGPT instantly recommends Canva, opens it, and you start designing — right there in the chat window.
Same with Coursera, Figma, Spotify, or Zillow.
All working inside ChatGPT.
Developers get a new Apps SDK to build these, and OpenAI will soon add an App Storewhere people can browse, use, and even pay for apps directly.
Huge news for creators and companies alike.
Agents That Actually Work
Next up — AgentKit.
This one’s all about helping developers build AI agents that can do real work.
Think of agents as your digital teammates. They can search files, connect to your systems, make decisions, and learn from feedback.
AgentKit gives ready-made building blocks like:
- Agent Builder – a drag-and-drop way to design agent workflows.
- ChatKit – a plug-and-play chat UI you can embed in your apps.
- Evals for Agents – tools to test and measure how well your agents perform.
- Connector Registry – to safely link your agents to internal or third-party tools.
Basically, this makes building reliable, secure AI assistants way easier.
Coding Gets an AI Partner
Meet Codex, OpenAI’s AI coding teammate.
It’s no longer an experiment — it’s now officially ready for everyone.
Codex can sit right inside Slack to write or review code in team chats.
It also has a Codex SDK to automate custom workflows, plus dashboards for admins to monitor how it’s used.
During the live demo, Codex literally:
- Controlled a stage camera,
- Adjusted the lights,
- Talked through voice commands, and
- Even rewrote its own app on the fly.
That’s next-level productivity right there.
New Models, New Possibilities
Two major upgrades here:
- GPT-5 Pro – OpenAI’s smartest model yet, built for complex and high-accuracy work like finance, legal, and healthcare.
- Sora 2 – the video-generation model that now lets developers create cinematic videos with synchronized sound directly from text prompts.
Imagine turning your idea or product concept into a beautiful short film — instantly.#LearnWithAI
That’s what Sora 2 makes possible.
What This All Means
OpenAI just made building with AI faster, easier, and more creative than ever.
Developers can now:
- Create mini-apps that live inside ChatGPT,
- Build full-fledged AI agents without coding chaos,
- Use Codex as a coding buddy, and
- Generate realistic videos with Sora 2.
The result?
Going from idea → product can now happen in minutes, not months.
Our Take at OPTIMISTIK INFOSYSTEMS
We’ve been closely following every update — because this changes how the world learns, builds, and innovates.
At OPTIMISTIK, we’re already experimenting with:
- Building micro-apps within ChatGPT for smarter learning and assessments,
- Using AgentKit to create AI assistants that support our learners and clients,
- Leveraging Codex to speed up course-content creation, and
- Bringing Sora 2 into our visual storytelling for AI and GenAI training programs.
The future of AI learning and development is getting real-time, hands-on, and unbelievably creative — and we’re here for it.
Stay tuned.
Because the next wave of AI innovation won’t just be built with ChatGPT — it’ll be built inside it.
