OpenAI Open Model Hackathon Online Build with gpt-oss, OpenAI’s open weight reasoning models. $30,000 in prizes Winners announced 8635 participants
CQhack25: A Quantum Computing Hackathon & Ideathon for Students Online A Quantum Computing Hackathon + Ideathon for Students to Learn, Collaborate, and Explore $1,900 in prizes Winners announced 302 participants