OpenAI DevDay 2025 Overview: Breakdown of All Announcements

OpenAI DevDay 2025 — important event in artificial intelligence world. And this is not just another presentation. I gathered all important facts, features, opinions for you and you’ll learn everything most interesting that OpenAI CEO Sam Altman told.

Sam Altman began performance with numbers. And numbers speak for themselves. Eight hundred million people use ChatGPT every week. That’s twice as many as just seven months ago. Four million developers worldwide create products based on OpenAI. Six billion tokens per minute are processed through API platform. For comparison — in 2023 it was only two hundred million.

Bill Gates already called this event a moment of same magnitude as transition from command line to graphical interface. He stated: “Agents are smarter. They’re proactive — capable of making suggestions before you ask. They execute tasks across multiple applications”.

Imagine: you’re working in ChatGPT and need to create design in Figma, find apartment on Booking, compile playlist in Spotify or watch tutorial video on Coursera. Before you would open dozen tabs, switch between applications, lose context.

Now everything works right inside chat. You simply say: “Find me an apartment in Paris center for weekend”. And ChatGPT calls Booking, starts searching options, clarifies details and shows results. All in one window. Without switching.

Or another scenario. You sketched interface draft on napkin, photographed. Threw into chat and said: “Make full-fledged Figma project from this”. Agent opens Figma right in ChatGPT and assembles working mockup. You see result instantly and can refine it on spot.

OpenAI called this Apps SDK. Toolkit for developers, built on MCP standard. And these aren’t just integrations. These are full-fledged applications that live inside artificial intelligence.

Main advantage — access to eight hundred million users. Developer creates application, passes OpenAI verification, and his product is immediately seen by hundreds of millions of people. Plus built-in monetization. Payment and analytics work through ChatGPT. No more need to think how to attract first users — they’re already here.

Paul Drews, Managing Partner Salesforce Ventures, noted: “We’re in process of technological shift: transition from generative to agentic AI. While 2024 was dedicated to creating and testing models. Agents are next step in applying AI in real world”.

But there are also downsides. First, this doesn’t work everywhere yet. EU is excluded from first launch wave. Second, to publish your application, you need to pass OpenAI verification. Third, security questions arise. When dozens of applications get access to your data through one platform, leak risks increase manifold.

Simon Willison, known tech blogger, warned at DevDay: “This sounds like deadly triple threat problem. If you’re connecting agents to your private data from different connectors, you need to be absolutely sure there are no holes for exfiltration. Through which attacker can steal your data”.

Sam Altman also introduced AgentKit. AgentKit is platform that turns agent creation from art for programmers into constructor for everyone.

Foundation is three components. First — Agent Builder. This is visual editor where you simply drag blocks and assemble agent logic. Need bot that checks emails, analyzes tasks and sends notifications to Slack? Take ready modules, connect with arrows — done. At DevDay, OpenAI engineer Christina Huang built working agent in eight minutes right on stage.

Second component — ChatKit. Ready chat interfaces that can be embedded into any website or application. You customize appearance for your brand, add needed functions. And you have full-fledged AI assistant for customers. Without programming.

Third — Evals. Agent testing system. You can check how each step works, evaluate response quality, optimize prompts automatically. And most pleasant — if you need code of what you built, platform simply gives it. Copy and use wherever you want.

Chris Hay from IBM said in his interview: “Most organizations aren’t ready for agents. Interesting will be opening APIs that exist in your companies today. That’s where fascinating work will happen. And it’s not about how good models are. It’s about how ready your business is”.

But there are nuances. AgentKit is direct competitor to Zapier, Make and other automation platforms. Only here instead of simple rules, intelligent agents work. Cost not announced yet, but obviously it will be paid subscription on top of OpenAI base plans.

And main risk — security. When you give agent access to internal company systems, to customer databases, to financial data. And one wrong connector can turn into hole for information leak.

I’ll tell more briefly about other novelties from OpenAI DevDay. AI-based programming tool Codex left preview for full release. Now it integrates with Slack, gives analytics for companies. And works on GPT-5-Codex — specialized model for coding. Since August its usage grew tenfold.

Showed GPT-Realtime-Mini. This is voice model that costs seventy percent cheaper than full version but preserves voice quality and expressiveness. Supports connectors, works with images, can call.

And important event — final presentation with Jony Ive. Legendary Apple designer who created iPod, iPhone and iPad now heads design at OpenAI. Company bought his startup io for six and half billion dollars in May this year. At DevDay, Altman and Ive discussed future of AI devices. Although specific announcements didn’t follow. But according to rumors, OpenAI is working on hardware without screen — something like smart assistant that’s always with you.

Let’s now look how this changes reality. ChatGPT transforms into operating system. This is no longer just chatbot. This is platform where applications live, agents work, content is created. Satya Nadella from Microsoft said: “Next year you’ll have team of agents working for you. This could look like IT agent fixing technical problems before you notice them. Supply chain agent preventing failures while you sleep, or sales agents destroying barriers”.

For developers this means simplicity. Before, to create smart bot, you needed to know programming, machine learning, API work. Now visual constructor is enough. Entry barrier fell almost to zero.

For business — direct access to huge audience. No need to spend millions on marketing and promotion. Created application, passed verification — and your product is seen by eight hundred million people.

But there’s also other side. Competition intensifies. Google with Gemini and Veo, Anthropic with Claude — all chase leadership. Prices fall, features are copied, market consolidates. Gartner analysts predict: “By 2030, fifty percent of all service requests will be initiated by machine clients. Controlled by agentic AI systems”.

So, OpenAI DevDay 2025 — these aren’t just announcements. This is paradigm shift. AI stops being tool we use. It becomes platform on which we build future.

This is only beginning. Ahead — AI browser from OpenAI, new devices with Jony Ive, deepening into enterprise segment. Altman says profitability isn’t in top ten priorities. Main thing — investments and growth. Company spends eight hundred fifty billion dollars on infrastructure and new models.

Sam Altman ended presentation with words: “We’re observing something significant. Before, creating software took months or years. You just saw it can be done in minutes with AI. You don’t need huge team. You need good idea, and you can simply bring it to reality faster than ever”.