OpenAI Build Week Community Hackathon – Paris

​Codex Community Hackathon — Paris In collaboration with 42 AI

​A day of building with Codex at 42's Paris campus. Start something new from scratch, push an existing project further, or prototype an idea you've been sitting on — using Codex as your primary building tool.

​Expect a high-signal room of motivated builders, useful feedback, and real demos at the end of the day.

​Event Details

​📅 Saturday, 18 July 2026

​🕙 10:00 – 18:00

​📍 42 Paris — precise location shared on approval

​Schedule

​10:00 · Kickoff, team building & briefing

​10:30 – 13:00 · Build sprint

​13:00 – 14:00 · Lunch

​14:00 – 16:30 · Build sprint

​16:30 – 17:15 · Demos

​17:15 – 17:45 · Judging

​17:45 – 18:00 · Winners, closing & photo

​Who This Is For:

​Builders curious about Codex and agentic software engineering. No prior Codex experience required, though some familiarity with coding tools is recommended. Open to 42 students and external builders alike.

​How It Works: Build something meaningful with Codex — a new project, an open source extension, a developer tool, or an agent workflow. Teams of up to 4. Attendance is capped and registration is subject to approval.

​Prizes:

​will be announced before the event.

​Registration

​Please complete the registration form carefully. If joining as a team, each member must register individually and receive approval.

​Hosts

​Boris de Wit (borvibe) — Codex Ambassador & Starboat Founder

​42AI — the AI hub of École 42, France’s most selective programming institution

​The hackathon is open to both 42 students and anyone excited to build with Codex and become part of the community.

​Free to attend. Bring a laptop, a project idea, and some building energy. 🙂