OpenAI Build Week: $100K Results, Winners, and Everything That Happened

OpenAI Build Week was a global week-long hackathon built entirely around Codex and GPT-5.6. It opened July 13, 2026, drew over 40,000 registered participants, and closed submissions on July 21. Winners announce on August 12 at 2:00 PM PDT. This page covers everything that happened — and will update when results land.

OpenAI Build Week: Live Timeline

August 12, 2026 — Winners Announced

Results are scheduled for 2:00 PM PDT. This page will update with winners, standout projects, and any follow-up opportunities OpenAI announces. Check back on August 12.

July 22 – August 7, 2026 — Judging Period

Submissions closed July 21 and entered the judging period. The review panel includes senior OpenAI staff: Thibault Sottiaux (Head of Product and Platform), Kath Korevec, Tara Seshan, Leah Belsky (VP of Education), and Peter Steinberger (Member of Technical Staff). They are evaluating every submission across four dimensions — technological implementation, design, potential impact, and quality of the idea.

Note: the original rules listed August 5 as the judging end date. The Devpost page subsequently listed August 7. The exact close of the review period remains slightly uncertain, but August 12 for winners is confirmed.

July 13–21, 2026 — Submission Window

Over 40,000 developers registered during the submission window — up from the 8,600 figure reported at launch, making this one of the largest AI hackathons ever run. Participants had until July 21 at 5:00 PM PT to submit. Free Codex credits ($100 per entrant) expired July 31.

July 13, 2026 — Challenge Opens

OpenAI launched Build Week on July 13 as an official hackathon managed through Devpost. The premise was straightforward: build real software using Codex and GPT-5.6 together, across one of four tracks. Live Academy sessions, Discord office hours, and community meetups ran throughout the week.

What OpenAI Build Week Was

Build Week was not a traditional single-day hackathon. It ran for a full week with live learning, community events, and a formal submission process attached to real prizes. OpenAI designed it specifically to show what Codex could do in the hands of a broad developer community — students, founders, researchers, and first-time builders alike.

Prize Structure

The total prize pool was $100,000 split across four tracks, each with two cash awards. Every track carried a $15,000 first prize and a $10,000 second prize — eight winners in total. The four tracks were Apps for Your Life, Work and Productivity, Developer Tools, and Education.

Beyond cash, prizes included OpenAI credits, DevDay 2026 passes — notable given that DevDay applications had already closed to the general public — and exclusive access opportunities with the OpenAI team. A Build Week win was one of the few remaining paths into DevDay for builders who missed the main window.

Eligibility

The event was open globally to anyone at the age of majority in a country where the OpenAI API is supported. Solo and team entries were both permitted. Residents of sanctioned regions including Russia, Iran, North Korea, Cuba, and Syria were excluded. Verified university students in the US and Canada could claim standing Codex credits through the Codex for Students program in addition to the standard $100 free credit offer.

What a Valid Submission Required

Every entry needed five things: a working project built with both Codex and GPT-5.6, a written project description, a narrated demo video under three minutes, a public code repository with a README and setup instructions, and the Codex Session ID showing where core functionality was built. Projects had to remain available free of charge during judging.

What Judges Were Looking For

Technological Implementation

This was the primary filter. Did the project actually work? Was Codex used in a non-trivial, meaningful way — not just for boilerplate generation, but as a core part of the build process? Judges could see the Codex Session ID, so surface-level use was visible.

Design and User Experience

A functional prototype beat a polished pitch every time, but a functional prototype with coherent design beat both. Judges wanted to see a complete product experience, not just a working technical demo.

Potential Impact

Projects needed to solve a real problem for a real audience. Vague concepts with broad appeal scored lower than specific tools addressing a defined user need. The more precisely an entry described who would use it and why, the better it performed on this dimension.

Quality of the Idea

Creativity and domain understanding both counted here. Judges rewarded entries that demonstrated the builder genuinely understood the problem space — not just the technology stack.

Free Codex Credits

Registered entrants could request $100 in free Codex credits on the Resources tab of the challenge page, available while supplies lasted. The request deadline was July 17 at 12:00 PM PT. Credits expired July 31, 2026. University students in the US and Canada had access to additional standing credits through the Codex for Students program.

For budgeting context: a small bug fix cost approximately 10 credits, while complex refactors consumed significantly more. Entrants who burned through credits before July 17 could request the free top-up through the official channel.

Related Reading

• OpenAI Crossed 8M Users on Codex and ChatGPT Work — and Inference Still Can’t Keep Up
• OpenAI Lifts the 5-Hour Usage Cap — What It Means for ChatGPT and Codex Users
• July 2026 Was the Wildest Month in AI History

Frequently Asked Questions

When are OpenAI Build Week winners announced?

Winners are announced on August 12, 2026 at 2:00 PM PDT on the official Devpost page.

How many people entered OpenAI Build Week?

Over 40,000 developers registered, making it one of the largest AI hackathons ever run. Early reports cited 8,600 participants at launch before registrations accelerated through the submission window.

What were the OpenAI Build Week prizes?

$100,000 total across four tracks — Apps for Your Life, Work and Productivity, Developer Tools, and Education. Each track awarded $15,000 for first place and $10,000 for second place, plus OpenAI credits, DevDay passes, and exclusive experiences with the OpenAI team.

Could beginners enter OpenAI Build Week?

Yes. OpenAI explicitly welcomed first-time Codex users and builders of all experience levels. Live Academy sessions, Discord office hours, and community meetups ran throughout the week to support newcomers.

What did a valid Build Week submission require?

A working project using both Codex and GPT-5.6, a written description, a narrated demo video under three minutes, a public code repository with setup instructions, and the Codex Session ID showing where core functionality was built.