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Re‑scoring detectors collapses headline results. When replacing ROUGE with LLM‑as‑Judge, AUROC drops are large: up to −45.9% for Perplexity and −30.4% for Eigenscore on NQ‑Open with Mistral; PR‑AUC gaps are even larger. Correlation between ROUGE‑ and LLM‑based AUROC is only r = 0.55.
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"text": "Re‑scoring detectors collapses headline results.\n\nWhen replacing ROUGE with LLM‑as‑Judge, AUROC drops are large: up to −45.9% for Perplexity and −30.4% for Eigenscore on NQ‑Open with Mistral; PR‑AUC gaps are even larger.\n\nCorrelation between ROUGE‑ and LLM‑based AUROC is only r = 0.55.",
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