OpenAI’s DevDay 2026 is officially on the calendar, and the call to apply has just gone live. If you’ve been watching the AI world spin faster each month, you’ll know that September 29 in San Francisco has become the unofficial holiday for anyone who builds with the company’s models, tools, and APIs. The announcement landed with the usual mix of excitement and a hint of urgency—applications are open now, but they’ll close on July 10, giving hopeful attendees just over a month to get their materials together.

What makes DevDay feel different from the sea of tech conferences that populate the fall calendar is its laser focus on the people actually writing the code, stitching together agents, and experimenting with the newest model releases. It’s not a stage for flashy keynotes aimed at investors or a showcase for consumer products; it’s a working session where the API by-by developers. The first tried to reveal of- the kind of concrete upgrades that help teams ship faster. The following year, they dialed back the spectacle a little, but still delivered a voice- API update that quietly launched a wave of voice-enabled apps. By 2025, the event had grown into something that felt like a mini- summit: Sam Altman sharing the stage with Jony Ive, AgentKit making its debut, Sora 2 sliding into the API for programmable video, and Codex receiving Slack integration and a fresh SDK. Those releases weren’t just headline grabbers; they were the kind of tools that let a solo developer spin up an agent without drowning in boilerplate, or let a media team generate video straight from a prompt.

Fast forward to 2026 and the momentum shows no sign of slowing. The company’s model lineup now reads like a rapid-fire release schedule—GPT-5.5, GPT-5.4, GPT-5.3 Instant, GPT-5.3-Codex—each arriving in quick succession. The developer base has swollen to roughly four million active builders, and weekly ChatGPT users have punched past the eight-hundred-million mark. Under the hood, the platform is chewing through about six billion tokens per minute, a figure that speaks to a shift from curious experimentation to production-grade deployments. All of that activity is what DevDay 2026 will try to contextualize for the people who are actually making it happen.

The practical side of attending has also evolved. OpenAI isn’t simply selling tickets to the highest bidder; it’s curating the crowd. This year, they’ve added a twist that feels both playful and strategic: each week leading up to the event, they’ll pick a few developers who have built something noteworthy with OpenAI’s tools and award them free passes. It’s a way to turn the pre-event into a sort of ongoing showcase—developers are encouraged to ship projects, share them publicly, and potentially earn a spot in the room where the next announcements will drop. The idea is simple: reward the builders who are already doing the work, and let the community see what’s possible when you put the latest models into practice.

Logistically, the gathering will return to the Fort Mason Center in San Francisco, a venue that has become synonymous with the city’s resurgence as the gravitational pull of AI research and startups. The Bay Area’s concentration of talent—OpenAI, Anthropic, a raft of fledgling AI firms, and the engineers who flip between them—makes the location feel less like a convention center and more like a meeting of peers who already run into each other at coffee shops, hackathons, and late-night debugging sessions. For anyone who’s watched the scene evolve from a handful of research papers to a bustling ecosystem, DevDay feels like the annual family reunion where everyone shows off what they’ve been tinkering with over the past year.

If you’ve been to a DevDay before, you know the rhythm: a keynote that frames the year’s big themes, a series of deep-dive sessions that range from API updates to practical workshops on agents, evaluation, and enterprise adoption, and plenty of hallway conversations where ideas get swapped over coffee or a quick bite. The 2025 edition gave us a preview of what to expect—live demos of apps inside ChatGPT, a first look at AgentKit, and the tantalizing promise of Sora 2’s video generation with synchronized soundscapes. This year, the rumor mill is already humming about what might be unveiled: perhaps further refinements to the GPT-5 family, new tooling for multimodal workflows, or updates to the Codex ecosystem that make it even easier to slide AI-generated code into existing pipelines.

What’s clear is that OpenAI sees DevDay less as a product launchpad and more as a feedback loop. The company wants to hear directly from the people who are pushing its models to their limits, to understand where the friction points are, and to shape the next set of releases around those real-world needs. For developers, it’s a chance to peek behind the curtain, ask questions of the folks who built the models, and leave with a clearer sense of where to invest their own time and energy.

So if you’ve been tinkering with the API, building an agent that automates a tedious workflow, or experimenting with video generation in Sora, now’s the moment to throw your hat in the ring. Fill out the application, share a brief description of what you hope to get out of the day, and, if you’re feeling ambitious, link to a project that shows off what you can do with OpenAI’s current toolkit. The deadline is July 10, and after that, the selection process will begin, with those weekly free-ticket draws kicking off in the weeks that follow.

Whether you’re a solo coder working out of a bedroom, a startup founder polishing a pitch, or an engineer at a larger firm trying to bring AI into legacy systems, DevDay 2026 promises to be a concentrated burst of insight, inspiration, and—if you’re lucky—a front-row seat to the next wave of tools that will shape what we build with AI. The doors are opening; the only thing left to do is step through.