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Open Atlas - AI for Social Good Hackathon 2026, presented by Manifest Milpitas, CA, USA Builders, in a room, solving real problems. Ship AI-powered solutions for immigration, healthcare, education, and financial inclusion. $4,500 in prizes Jun 20 – Aug 16, 2026 450 participants
OpenAI Open Model Hackathon Online Build with gpt-oss, OpenAI’s open weight reasoning models. $30,000 in prizes Winners announced 8636 participants