Reddit’s Game of the Day Hackathon Online Join Reddit to build incredible daily games! $35,000 in prizes Dec 08, 2026 09:00 PM EST to submit 1265 participants
PayPal AI Hackathon Online Build what’s next with PayPal and AI $67,500 in prizes Winners TBD 35825 participants
Codex x TwitchCon Hackathon Online Build for streamers and their community on Twitch with OpenAI Codex. $25,000 in prizes, and the top 5 are shown on the Codex Booth stage at TwitchCon. $25,000 in prizes Winners TBD 2217 participants
CALL-E: Your Code Is Calling Online Turn your code into an AI agent that makes real phone calls. $10,000 in prizes Winners announced 3197 participants
Kiroween Online Build something wicked for Kiroween, our annual Halloween-themed hackathon where developers dare to code in dark mode $100,000 in prizes Winners announced 4957 participants