OpenAI Codex Hackathon - Sydney

​Join us for a day of building with Codex together with our friends at UTS Startups, the largest early stage startup incubator in Sydney. ​​​We’re bringing together 100 of Sydney's most ambitious builders — developers who already use AI coding tools daily and are comfortable shipping production-grade code. This is not an introductory workshop. Expect to move fast, build from scratch and publish what you build onto /r/codex. Spin up subagents & parallel tasks, use plugins, and leverage worktrees to operate at a higher level of velocity and ambition. Each builder will receive API credits and 1 month of ChatGPT Pro.What will you build? ​🥇 ​Prizes Prize pool of over ~200k USD in credits & subscriptions will be available. Register by 18 April ​Attendance is capped (maximum of 4 members per team) to keep the room high-signal & deeply hands-on. ​​​Please note that due to venue capacity, registration is subject to approval. ​​Kindly complete the registration form with your accurate details, as incomplete or inaccurate submissions will not be admitted. Selected and waitlisted participants will be notified by 20 April. ​Note: If you intend to participate as a team, all members must register individually and receive approval separately.​​ ​Build Directions The theme for the challenge and evaluation will be shared on the day. ​Focus on ideas that wouldn’t be possible without Codex. Build with Codex, or on top of it (App Server, SDK, or your own abstractions). ​If any of these directions resonate — apply: ​🔹 Agentic Coding — Build developer tools that maximise leverage from Codex as an AI coding agent ​🔹 UX for Agentic Applications — Design AI-native interaction patterns and product flows ​🔹 Multimodal Intelligence — Create systems that reason across text, voice, and vision ​🔹 Domain Agents — Go deep on vertical agents with real-world constraints ​🔹 Building Evals — Build tooling to measure, debug, and improve agent performance ​Event details ​📅 April 29 (Wednesday)🕘 9:00 AM – 8:00 PM📍 Location shared upon registration confirmation ​Co-hosted with The home of Sydney's best emerging startups.