Morning Edition · Thursday, July 16, 2026Published at 1:44 AM EDT · New York
Study Finds Activation Probes Flag Risk But Cannot Reliably Judge Whether Context Makes a Request Harmful
Residual-stream probes struggle to separate harmful prompts from surface-matched benign ones at any useful operating point, limiting their role as automatic safety filters.
A paper titled The Entanglement Wall examines a popular interpretability technique for safety: probes trained on a model's residual stream to detect harmful requests. The authors start from an uncomfortable fact. Context can flip whether a…
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