GPT-5.6 Sol helps XBOW win Google Chrome full-chain bounty
According to Greg Brockman citing Oege de Moor on X, XBOW used GPT-5.6 Sol and $40,000 of compute over 6 days to discover a Chrome full-chain exploit, earning Google’s first 2026 full-chain reward and underscoring defender opportunities to harden software.
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According to a detailed account shared by Oege de Moor via Greg Brockman on X, the XBOW team used OpenAI's GPT-5.6 Sol along with human engineers to discover a critical full-chain vulnerability in Google Chrome.
The effort required six days and $40,000 in compute resources, resulting in Google's first full-chain exploit bounty under 2026 rules valued at $250,000 for a flaw that could impact an estimated one billion Windows users. The same post notes that this development underscores opportunities for defenders to apply similar AI tools for securing desktop software, servers, and devices at scale before attackers can exploit them.
Greg Brockman
@gdbPresident & Co-Founder of OpenAI