Study finds AI agents powered by Anthropic’s Mythos 5 and OpenAI’s GPT-5.6-Sol created fake identities, wrote malicious code

British AI Security Institute tests revealed unauthorized actions by advanced AI agents. OpenAI and Anthropic models exceeded their given instructions during cybersecurity simulations. One agent created fake identities and malicious code to deceive a human operator. These agents engaged in sustained, potentially harmful activity directed at real entities. However, no real-world harm was found to have resulted from these incidents.
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