OpenAI DevDay 2025

DevDay 2025 opens with ideas that will challenge how you think about building. Join us for announcements, live demos, and a vision of how developers are reshaping the future with AI.

Cursor has grown from next action prediction to fully autonomous coding agents. Learn how they’ve built their agent harness and tools, approached context engineering, and enabled support for running many agents in parallel.

Click, connect, create. Learn how to quickly design and deploy enterprise-grade agents with a new suite of agentic platform tools.

Ever wonder how OpenAI is using our own technology? Discover how we build reliable agents for sales, support, finance, and data, then take home a framework for spotting and scaling high-leverage use cases.

No city embraces the future like San Francisco. Get inspired by local developers using AI to tackle real challenges: making SF services work, improving housing options, and strengthening community.

How do you measure progress when you're operating at the frontier? Step inside the evolving world of AI evaluation, where benchmarks are being redefined to capture reasoning, reliability, and model progress in real-world task performance.

Hear how OpenAI engineers use Codex to rethink how code gets written, refactored, and merged.

From pair programming in your local environment to delegating tasks to the cloud, this session focuses on how Codex is unlocking a faster, more creative future for coding.

Why does ChatGPT sound the way it does? Go behind the scenes to see how the style a model emerges, the trade-offs researchers weigh, and what the future of tone and voice in human-AI interaction could look like.

Join a live AMA with Decagon & Clay founders and an Andreessen Horowitz investor on cracking enterprise AI adoption—why many enterprise AI pilots fail, what founders get wrong, and how they scaled to become unicorns.

The best dev teams scale impact, not headcount. In this session, founders from Charlie Labs, Warp, CodeRabbit, and Jam will demo tools that speed up shipping, streamline code reviews, and keep your codebase clean—turning small teams into force multipliers.

Go beyond out-of-the-box models with gpt-oss, OpenAI's newest open model series. Discover how gpt-oss lets you adapt, extend, and fine-tune to your needs while combining seamlessly with GPT-5 for flexible, high-impact builds.

AI is changing how quickly creative ideas can become reality. In this session, we’ll walk through how we built a custom creative tool for film, media, and brand campaign workflows. We’ll share lessons from rapid prototyping with modern tools, and offer a look at how developers can shape the future of creative production.

Agents explore, plan, and reliably execute across diverse, long-horizon tasks—challenges that static benchmarks can't measure. Hear from Greg Kamradt, President of the ARC Prize Foundation, on how evaluating agentic performance requires interactive evaluations.

The developer experience is being rewritten with AI. The Developer State of the Union will explore how Codex, gpt-oss, and our API open up powerful ways to build, experiment, and scale. We’ll share the latest updates, demo new capabilities, and look ahead at what’s next for developers.

Join Sam Altman and Jony Ive for a wide-ranging conversation about the craft of building in the age of AI. Together, they will explore the importance of strong working relationships, the design process, and what it means to build tools thoughtfully, responsibly, and beautifully.