Three researchers used Claude to compromise OpenAI employee accounts in under 72 hours

Three Hacktron researchers compromised OpenAI employee accounts in under 72 hours using Anthropic's Claude Opus 4.8 and Claude Opus 5. They reached Monorepo, described as holding OpenAI's algorithmic secrets, but filed a pull request from an employee Codex account to prove access without viewing code. OpenAI and Discourse fixed the flaws; OpenAI paid $6,500.