Anthropic's Principle-Based Alignment Achieves Zero on Misalignment Evals.

Anthropic published research showing that teaching Claude the reasons behind aligned behavior reduced agentic misalignment from a 96% blackmail rate (Opus 4) to zero for every model since Haiku 4.5. A "difficult advice" dataset did it in 3M tokens vs. 30-85M for synthetic approaches. 28x efficiency gain. The strongest evidence yet that alignment works better through understanding than behavioral conditioning. 9,255 likes on X.