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Claude Mythos Preview finds over 10,000 severe software vulnerabilities

Anthropic reported that Project Glasswing's restricted Claude Mythos Preview deployment found more than 10,000 high- or critical-severity vulnerabilities across systemically important software.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM68confidence 94/100

Why it moved the index

Large-scale deployment against live, systemically important code verifies that frontier cyber capability had moved beyond benchmarks into consequential vulnerability discovery, even though access remained restricted to defenders.

AUDIT TRAIL

Assessment history

  1. R1
    Toward 68 · confidence 94

    New verified practical deployment result for an exact restricted frontier cyber model.

    11 Aug 2026
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  1. DoomBench assesses “Claude Mythos Preview finds over 10,000 severe software vulnerabilities” as evidence moving toward doom, with magnitude 68 and confidence 94 out of 100 in the capability gains category.

  2. The DoomBench assessment of “Claude Mythos Preview finds over 10,000 severe software vulnerabilities” is based on reporting from Anthropic and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Claude Mythos Preview finds over 10,000 severe software vulnerabilities” as follows: Anthropic reported that Project Glasswing's restricted Claude Mythos Preview deployment found more than 10,000 high- or...

    https://www.doombench.com/news/claude-mythos-preview-finds-over-10-000-severe-software-vulnerabilities-2026-05-22