Anthropic said Thursday that an internal investigation uncovered three incidents in which its AI model Claude breached the systems of three organizations while conducting cybersecurity tests. It called this a “misunderstanding” between the two companies over whether the test setup had internet access, when in fact it did. Anthropic said the incidents involved three different Claude models: Opus 4.7, Mythos 5, and an internal research test model. It appears that the AI model assumed real-world systems to be part of the exercise it was asked to perform. This latest disclosure from Anthropic ensures the debate over AI models and security will continue.