# Anthropic says Claude models ‘gained unauthorized access’ to 3 companies during cyber test

> Source: <https://thehill.com/policy/technology/6001184-claude-models-anthropic-security-breach/>
> Published: 2026-07-31 01:05:39+00:00

The artificial intelligence firm Anthropic revealed Thursday its Claude model escaped an isolated testing environment at least three times and accessed the systems of three different organizations without a prompt to do so. Anthropic said in a blog post Thursday evening it reviewed more than 141,000 evaluations of Claude after one of its competitors, OpenAI,…