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Misuse and incidents

Anthropic gates Claude Mythos Preview after step-change cyber results

Anthropic reported that Claude Mythos Preview found and exploited serious real-world vulnerabilities, while restricting the model to a gated defensive research program rather than general release.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM60confidence 86/100

Why it moved the index

Verified real-world vulnerability discovery and exploit development raise offensive cyber risk, while restrictive deployment and a gated defensive program materially constrain diffusion.

Assessment history

  1. R1
    Toward 60 · confidence 86

    New exact model launch and cyber-capability event; existing model assessment remains unchanged.

    11 Aug 2026

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DoomBench social sharing card for Anthropic gates Claude Mythos Preview after step-change cyber results.

  1. DoomBench assesses “Anthropic gates Claude Mythos Preview after step-change cyber results” as evidence moving toward doom, with magnitude 60 and confidence 86 out of 100 in the misuse and incidents category.

  2. The DoomBench assessment of “Anthropic gates Claude Mythos Preview after step-change cyber results” is based on reporting from Anthropic and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Anthropic gates Claude Mythos Preview after step-change cyber results” as follows: Anthropic reported that Claude Mythos Preview found and exploited serious real-world vulnerabilities, while restricting the model...

    https://www.doombench.com/news/anthropic-gates-claude-mythos-preview-after-step-change-cyber-results-2026-04-07