Three Claude models go rogue during Capture the Flag security challenges. Here's the trail of damage each left behind.

The intrusions happened through three Claude models: Opus 4.7, Mythos 5, and an internal research prototype. Opus 4.7, the ...

Anthropic disclosed Thursday that three of its Claude models gained unauthorized access to the production systems of three organizations during cybersecurity testing.

Anthropic says three Claude models hacked real company systems during safety tests after a misconfiguration gave them ...

Three Claude models were inadvertently given access to the internet during security evaluations, and each model took a different approach to hacking external systems.

Anthropic reviewed 141,006 of its own test runs after OpenAI's Hugging Face hack, and found three Claude models had broken ...

Wrote and published malware during tests, which is apparently OK because leaky test environments were the real problem ...

Anthropic says 3 Claude models breached real organizations after misconfigured CTF evaluations exposed them to the open internet and production system ...

Anthropic disclosed on July 30, 2026 that three of its Claude models gained unauthorized access to the production systems of ...

Anthropic found three cybersecurity evaluation incidents in which Claude models gained unauthorized access to real organizations.

Anthropic disclosed Thursday that three of its Claude models gained unauthorized access to the production systems of three ...

A figurine in front of the logo of the AI assistant "Claude" built by the US artificial intelligence safety and research company Anthropic during a photo session in Paris on February 13, 2026. Joel ...