Across five LLMs, a sharp decrease in embedding isotropy at a critical layer predicts multiple-choice accuracy, with Spearman correlations up to -0.92.
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Isotropy Cliffs: The Geometric Signature of Decision-Making in Large Language Models
Across five LLMs, a sharp decrease in embedding isotropy at a critical layer predicts multiple-choice accuracy, with Spearman correlations up to -0.92.