OpenAI Build Week Online Join a global week of building with Codex $100,000 in prizes Winners TBD 46742 participants
Multiagents Hackathon Greater London, United Kingdom tokens& Hacks lands in London. Build something real with multi-agent systems and learn from the teams actually building the tools. £9,500 in prizes Jun 26, 2026 81 participants
VibeHack London 2026 Greater London, United Kingdom A 24-hour AI hackathon at UCL where builders ship real products, not slides. £3,500 in prizes Jun 6 – 7, 2026 148 participants
Perplexity Hackathon @ London, UK Greater London, United Kingdom Create an internet-enabled project to inspire curiosity, seek knowledge, or reason through complex tasks. £8,000 in prizes Oct 17 – 18, 2025 86 participants
World’s Largest Hackathon presented by Bolt Online Build with AI for a shot at some of the $1M+ in prizes. $1,037,500 in prizes Winners announced 128346 participants
