Safety-institute red teams harden Anthropic's Claude jailbreak defenses
Anthropic reported that US CAISI and UK AISI tested Constitutional Classifiers around Claude Opus 4 and 4.1 using prompt injection, universal-jailbreak, and cipher attacks. Anthropic patched vulnerabilities and restructured parts of the defense architecture before wider deployment.
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AWAY FROM DOOM40confidence 90/100
Why it moved the index
The exercises used authorized researchers, early or specially accessible configurations, and controlled adversarial methods. They were not real-world compromises. The practical impact is verified by patches and architecture changes made in response to reproduced attack paths.
AUDIT TRAIL
Assessment history
- R1Away 40 · confidence 90
New historical evidence found in the September 2025 gap review.
13 Aug 2026