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Safety and alignment

Anthropic deploys stronger browser-agent prompt-injection defenses

Anthropic combined Claude Opus 4.5 training, content classifiers, intervention logic, and continuous red teaming to reduce adaptive prompt-injection attack success to about one percent and expanded Claude for Chrome to beta.

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CURRENT ASSESSMENT · REVISION 1
AWAY FROM DOOM35confidence 85/100

Why it moved the index

A measured and deployed defense against agent hijacking directly strengthens human control over browser agents that process attacker-controlled content.

AUDIT TRAIL

Assessment history

  1. R1
    Away 35 · confidence 85

    New historical safeguard-deployment record supported by Anthropic's dated technical report.

    11 Aug 2026
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  1. DoomBench assesses “Anthropic deploys stronger browser-agent prompt-injection defenses” as evidence moving away from doom, with magnitude 35 and confidence 85 out of 100 in the safety and alignment category.

  2. The DoomBench assessment of “Anthropic deploys stronger browser-agent prompt-injection defenses” is based on reporting from Anthropic and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Anthropic deploys stronger browser-agent prompt-injection defenses” as follows: Anthropic combined Claude Opus 4.5 training, content classifiers, intervention logic, and continuous red teaming to reduce adaptive...

    https://www.doombench.com/news/anthropic-deploys-stronger-browser-agent-prompt-injection-defenses-2025-11-24