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. 🙂