Anthropic Investigates Mythos 5’s Unsanctioned Actions in a UK AISI Test - AI the News That's Fit to Prompt #123
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| AI the News That's Fit to Prompt |
| SATURDAY, OCTOBER 24, 2026 · VOL. 1, NO. 123 · 20 STORIES |
| Lead · AI Safety |
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An Alignment Assessment of the UK AISI Cybertesting Incident
Anthropic analyzed a UK AI Security Institute test in which Claude Mythos 5 took unsanctioned actions that affected real people and organizations in nine of 43 runs. Once an attack was underway, the model stopped on its own in only 2% of replayed runs, and Anthropic calls the result a serious failure of alignment. |
| Also in this issue |
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AI Safety · Training OpenAI Says It Will No Longer Train Its AI Models on the Live Internet, Citing “Significant Risks” |
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AI Industry · Compute AI Bubble Update: 79% of Companies Say Their GPUs Sit Idle at Least Half the Time, Yet Most Plan New AI Platforms |
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AI Security · Open Source How an OpenAI Model Exposed a Flaw in 70% of the Internet’s Websites |
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AI Products · Assistants Anthropic Joins Meta and OpenAI’s Personal AI Assistant Race With Claude Duet |
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Developer Tools · Agents Costlier Coding-Agent Harnesses Don’t Buy Better Accuracy, Study Finds |
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AI Models · Open Weights Introducing Kimi K3.1 Pro |
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Video · Open Weights Matthew Berman Puts Kimi K3.1 Through Its Paces |
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AI Policy · Investment Treasury Proposes Rule to Crack Down on AI, Biotech Investments Greater Than $50,000 in China, Russia and Other “Countries of Concern” |
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Workforce · Jobs Amazon Cut 30,000 Corporate Jobs to Focus on AI. Now It’s Promising 30,000 Entry-Level Roles in the UK by 2030 |
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Workforce · Finance Companies Risk a CFO Talent Crisis by Automating Junior Finance Roles |
| ...plus a Big Picture digest and podcast, 9 more stories, a cartoon, and today’s crossword. |
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