OpenAI DevDay 2026

OpenAI DevDay 2026 is OpenAI's annual developer conference, taking place on 29 September 2026 at Fort Mason in San Francisco and gathering well over a thousand developers in person — OpenAI has framed it as its biggest developer event of the year. It is the occasion where the company that catalysed the current AI wave shows what its latest models can do and ships the tools to build on them. DevDay is aimed at software engineers, AI-application founders and product leaders, and what is announced here tends to set the direction for the wider ecosystem in the weeks and months that follow.

What's on the 2026 agenda

DevDay pairs a headline keynote with hands-on sessions, technical deep dives and workshops. While the detailed 2026 line-up is published closer to the date, the conference reliably covers the building blocks that AI engineering teams depend on: the API platform, new model capabilities, agent and tool-use frameworks, function calling, multimodal features, fine-tuning and customisation, and the pricing and infrastructure that decide what is actually economical to build at scale. Past editions have set the template by launching new flagship models, cutting inference prices sharply, and introducing primitives that thousands of startups adopt almost overnight. Because OpenAI ships across the full stack — from raw model access to higher-level agent and assistant frameworks — DevDay sessions tend to range from low-level API mechanics to opinionated patterns for assembling reliable applications on top of them. Typical areas of focus include:

• The API platform and the latest reasoning and multimodal models
• Agent-building tooling — planning, tool use and acting on a user's behalf
• Function calling, structured outputs and the integration patterns around them
• Fine-tuning, evaluation, safety controls and the economics of large-scale inference

Who should attend

DevDay is essential for the people who build with OpenAI's models and for those benchmarking the frontier more broadly. Developers come for the concrete releases and the rare chance to get hands-on with new capabilities directly from the team that built them; founders come to read where cost and capability are heading before committing a product roadmap; and engineering and product leaders come to understand the platform shifts that will shape their teams' work over the next year. Even those building on competing or open models watch DevDay closely, because OpenAI's announcements often reset expectations — and prices — across the entire market within days. The in-person format also makes it a dense networking moment for the applied-AI community, with workshops and labs that go well beyond what a livestream conveys and a hallway track full of teams solving the same engineering problems.

Why it matters now

DevDay is the clearest single signal of the platform shift underway in 2026: the move from chat interfaces to agents that plan, call tools and take actions on a user's behalf. The capabilities OpenAI exposes — stronger reasoning, longer context windows, cheaper inference and native tool use — effectively define the floor that every AI-engineering team builds on. When a price falls or a new model lands, the effects show up almost immediately in startup demos, internal prototypes and enterprise pilots. The 2026 edition arrives as the industry is wrestling with the practical realities of agents in production — reliability, evaluation, cost control and oversight — so the keynote and sessions double as a read on how OpenAI proposes to make agentic software dependable enough for real workloads. For developers, founders and product leaders, the conference matters both for the specific tools it releases and for the forward read it gives on where frontier capability and cost are going next. In an industry where roadmaps can be invalidated by a single release, that forward read is often as valuable as the announcements themselves.

How to attend

DevDay is primarily an in-person developer event in San Francisco, with attendance offered through an application process rather than open ticket sales, and the keynote typically livestreamed for the global developer community that cannot attend in person. Recordings, documentation and updated API references for any new releases are usually published immediately afterward, so the substance reaches everyone quickly. Developers who want to attend or follow along should watch the official OpenAI DevDay page for the application window, the agenda and livestream details as the date approaches.