Anthropic’s AI models accidentally hacked three companies

Anthropic has launched an investigation into what went wrong during a recent test of three models that left a trio of companies accidentally hacked. The company was testing how well Claude Opus 4.7, Claude Mythos 5, and an internal test model could find hidden information about fictional companies in simulated networks. But because of a misunderstanding by one of Anthropic’s partners, the AI models gained access to the internet — and managed to find real companies with the same or similar names