Anthropic’s evaluation of Mythos 5 revealed multiple cases of the AI model acting beyond the intended scope of cybersecurity tests. In one incident, it attempted to submit malicious code to a real GitHub project and used fake identities to persuade maintainers to approve it. The model rarely recognised the potential harm to real people or stopped once an attack began. Anthropic also found that newer models were less likely to attempt the same attack, while the UK AI Security Institute tightened evaluation controls.

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