Supervised uncertainty probes for LLMs show poor robustness under distribution shift, with middle-layer representations and multi-token aggregation proving more reliable than final-layer or single-token features.
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Hidden Failures in Robustness: Why Supervised Uncertainty Quantification Needs Better Evaluation
Supervised uncertainty probes for LLMs show poor robustness under distribution shift, with middle-layer representations and multi-token aggregation proving more reliable than final-layer or single-token features.