Hackers Used Anthropic’s Claude to Break Into OpenAI
September 18, 2026

(WSJ) – A bug-hunting independent security research team accessed OpenAI’s internal code system, exposing growing risks in automated cyber threats
Two weeks after a swarm of AI agents broke out of containment at OpenAI to hack the company Hugging Face, the ChatGPT maker learned about another AI-powered intrusion—and this time it was the target.
Independent security researchers had used Anthropic’s Claude software to gain access to an OpenAI employee’s ChatGPT account, giving them a way to read and suggest changes to the company’s private cache of software.
The team, who participated in an OpenAI bug-hunting program that offers a safe harbor for researchers to attempt to break into corporate systems, quickly reported their findings to the company. (Read More)