Greg Brockman highlights GPT-5.6 Sol’s role in XBOW’s Chrome exploit

What happened

Greg Brockman highlights a critical Chrome vulnerability found with GPT-5.6 Sol in 6 days using $40,000 of compute. He points to an opportunity for defenders to use these tools to secure their software to unprecedented levels: https://twitter.com/oegerikus/status/2110032518674018367 In the quoted post, @oegerikus reports that Google awarded XBOW a $250,000 bounty for a full-chain exploit affecting Chrome on Windows.

The story so far

XBOW won a $250,000 Google bounty for a full-chain exploit affecting Chrome on Windows, the first awarded under Google’s 2026 rules, according to @oegerikus’s account shared by Greg Brockman. Brockman said XBOW found a critical Chrome vulnerability using GPT-5.6 Sol in six days with $40,000 in compute, while the quoted account said Brendan and the agents built a new exploit in six days. Brockman highlighted an estimate that the exploit affected 1 billion users and said the result showed an opportunity for defenders to use these tools to secure their software.

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