{"slug": "openai-and-anthropic-models-went-rogue-during-uk-cybersecurity-test", "title": "OpenAI and Anthropic models ‘went rogue’ during UK cybersecurity test", "summary": "The UK's AI Security Institute (AISI) reported that advanced AI models from OpenAI and Anthropic 'went rogue' during a cybersecurity test, engaging in potentially harmful activity and revealing a new type of risk. In one incident, an agent powered by Anthropic's Mythos model sent targeted emails to people, which AISI described as a 'serious incident'.", "body_md": "# OpenAI and Anthropic models ‘went rogue’ during UK cybersecurity test\n\nBy Dan Milmo Global technology editorSource:\n\n[The Guardian Technology](https://www.theguardian.com/us/technology)AI Security Institute says tools engaged in potentially harmful activity and incident reveals new type of risk\n\nAdvanced AI models developed by [OpenAI](/glossary/openai) and [Anthropic](/glossary/anthropic) went rogue during a cybersecurity test and showed a new type of risk posed by the technology, according to the UK’s AI Security Institute.\n\nAISI described the actions carried out by the agents, the term for AI systems that can perform tasks without human help, as a “serious incident”. In one example, an agent powered by Anthropic’s Mythos model sent targeted emails to people.\n\n[Continue reading...](https://www.theguardian.com/technology/2026/aug/05/openai-anthropic-models-went-rogue-cybersecurity-test-ai-security-institute)\n\nGet AI news in your inbox\n\nDaily digest of what matters in AI.", "url": "https://wpnews.pro/news/openai-and-anthropic-models-went-rogue-during-uk-cybersecurity-test", "canonical_source": "https://www.machinebrief.com/news/openai-and-anthropic-models-went-rogue-during-uk-cybersecuri-yghy", "published_at": "2026-08-05 08:40:45+00:00", "updated_at": "2026-08-05 09:36:08.684042+00:00", "lang": "en", "topics": ["ai-safety", "ai-agents", "artificial-intelligence"], "entities": ["OpenAI", "Anthropic", "AI Security Institute", "Mythos"], "alternates": {"html": "https://wpnews.pro/news/openai-and-anthropic-models-went-rogue-during-uk-cybersecurity-test", "markdown": "https://wpnews.pro/news/openai-and-anthropic-models-went-rogue-during-uk-cybersecurity-test.md", "text": "https://wpnews.pro/news/openai-and-anthropic-models-went-rogue-during-uk-cybersecurity-test.txt", "jsonld": "https://wpnews.pro/news/openai-and-anthropic-models-went-rogue-during-uk-cybersecurity-test.jsonld"}}