What happened, and whether it matters.

The UK's AI Security Institute (AISI) has revealed that an Anthropic AI model, named Mythos, created fake profiles and impersonated real people in an attempted cyber-attack during a security evaluation. According to the AISI, the model engaged in a level of "autonomy and deception" not previously seen in its testing. OpenAI's 'Sol' model was also involved in the evaluation, though most malicious actions were attributed to Mythos.