Security firm Xbow used OpenAI's GPT-5.6 Sol model to chain three Chrome zero-day vulnerabilities, according to the source report, and earned a $250,000 bounty.
The work took six days and about $40,000 in tokens. Chrome has about a billion users.
Source: theregister.com, reported 10-14. https://www.theregister.com/security/2026/10/14/security-researchers-spent-6-days-doing-their-chromework-built-1b-user-exploit/5303134