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.
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
- R1Away 35 · confidence 85
New historical safeguard-deployment record supported by Anthropic's dated technical report.
11 Aug 2026