Did an unauthorized user access "Claude Mythos"? Overseas reports

Bloomberg reported that a small private forum group gained access to Anthropic’s Mythos on launch day and kept using it.

Anthropic said it is investigating reports of unauthorized access tied to a third-party vendor environment.

The incident raises concerns about control over a powerful unreleased model that could be used for both security work and misuse.

It also increases scrutiny from regulators and customers over Anthropic’s model access and vendor security.