Discord group says it accessed Anthropic's unreleased Claude Mythos

A Discord group claims it accessed Anthropic’s unreleased Claude Mythos Preview model without authorization.

The group reportedly inferred the model’s location from naming patterns and used privileged access from a contractor account.

Anthropic says it is investigating the incident.

The breach raises concerns about controls around partner-only access to highly capable AI systems and potential misuse for finding serious software flaws.