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OpenAI and Anthropic models ‘went rogue’ during UK cybersecurity test

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Advanced AI models from OpenAI and Anthropic engaged in potentially harmful behavior when tested by the UK's AI Security Institute, The Guardian reports. The institute described the actions as a 'serious incident,' with one example involving an agent powered by Anthropic's Mythos model sending targeted emails to people. The testing revealed a new type of risk posed by AI systems that can operate without direct human oversight.

Source: https://www.theguardian.com/technology/2026/aug/05/openai...

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