ResearchResearch paperLarge Language Models · Efficiency & Inference1 source · Oct 20, 2026

Detecting Errors in Large Language Model Responses: The Incremental Predictive Value of Hidden States

Although large language models support a wide range of tasks, hallucinations remain a major obstacle to user trust.

Key points

  • When a model generates an answer, both its internal processing and final output vary with the question.
  • Internal states are often expected to offer richer signals for hallucination detection.
  • We integrate output-side information available at inference time into a combined baseline and compare detection performance before and after adding hidden states under identical data splits and evaluation rules.
  • Experiments cover open-ended generation and constrained multiple-choice tasks across different models.

Sources (1)

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