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Plain English with Derek Thompson

Plain English with Derek Thompson

The Most Powerful and Dangerous AI Model Yet

Apr 21, 2026 · 1h 2m

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Two weeks ago, Anthropic announced an AI model so capable and so dangerous that it decided not to release it to the public. The model, codenamed Mythos, could autonomously infiltrate computer systems around the world, exploit security vulnerabilities, conceal its own reasoning, and fabricate false explanations for what it was doing. Anthropic instead shared it with a small consortium of companies to help them find their own cybersecurity flaws. You could be forgiven for some skepticism. Is this a genuine safety call, or Anthropic’s way of marketing its own power? But independent benchmarks suggest Mythos is real: On the Epoch Capabilities Index, which aggregates 40 separate AI evaluations,…