OpenAI Got Hacked by Anthropic's AI Models

How three researchers used Opus 5 to compromise the world's most powerful AI company in under 72 hours.

Sep 18, 2026

∙ Paid

OpenAI getting hacked with Claude Opus. Image by Jim Clyde Monge

Something crazy just happened in the AI world. Three guys with Claude and Codex subscriptions were able to use Opus 5 to access OpenAI auth tokens and gain write access to OpenAI’s monorepo over the course of two days.

My first reaction is… How? We are not talking about some classified, unre…

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