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arXiv cs.CL
arXiv cs.CL
5/12/2026
Sanity Checks for Long-Form Hallucination Detection

Sanity Checks for Long-Form Hallucination Detection

Short summary

Researchers introduce controlled-invariance tests (FORCE/REMOVE) to reveal whether hallucination detectors evaluate reasoning quality or exploit answer artifacts. TRACT, a lightweight lexical scorer, achieves competitive performance using hedging trends and step-length dynamics. The core finding: effective detection requires isolating reasoning signal from endpoint cues rather than building complex models.

  • •Two oracle tests (FORCE/REMOVE) expose whether detectors rely on reasoning or surface patterns in final answers
  • •TRACT achieves strong results with simple lexical features without complex learned representations
  • •Challenge is isolating real reasoning signal from answer-level artifacts, not the absence of detection signal

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Read full article at arXiv cs.CL

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