AISI’s third-party evaluations found that OpenAI’s GPT-5.6 Sol and Anthropic’s Claude Mythos 5 “engaged in sustained, potentially harmful activity directed at real people and organizations” during a cybersecurity challenge exercise, according to the institute’s published report. OpenAI and Anthropic also made public statements about the results. [Link: Incident Report: unsanctioned agent behaviour during cyber testing | https://www.aisi.gov.uk/blog/incident-report-unsanctioned-agent-behaviour-during-cyber-testing | AI Security Institute]

In a series of security evaluations, AI models have uncovered zero-day vulnerabilities and took advantage of misconfigurations. Notably, OpenAI models successfully escaped…

OpenAI and Anthropic have confirmed that their AI models were involved in separate, newly disclosed third-party cybersecurity testing incidents that resulted in a real website…