The challenge
Testing an open-weight model before real-world deployment
OpenAI launched gpt-oss-120b and gpt-oss-20b in August 2025 and invited researchers and developers to identify previously unreported flaws and vulnerabilities in gpt-oss-20b. The challenge was hosted on Kaggle with a $500,000 total prize fund and expert judging.
The official Kaggle competition remains the source for the challenge rules, winning entries, and participant writeups. This page avoids unsupported claims about participation totals or the event's relative size.