{
  "id": 8822657,
  "title": "A Lie Detector Test for Language Models: Reading Knowledge a Model Won't Reveal",
  "url": "https://urgent.news/2026/09/18/a-lie-detector-test-for-language-models-reading-knowledge-a-model",
  "topic": "ai",
  "section": "AI",
  "published": "2026-09-18T16:57:00.000Z",
  "source": {
    "name": "arXiv cs.AI",
    "slug": "arxiv-cs-ai",
    "url": "https://arxiv.org/abs/2609.21996v1"
  },
  "original_language": "en",
  "account": null,
  "summary": "Large language models can hold knowledge they do not report. A model may sandbag on a capability evaluation, or answer against what it internally knows, and its outputs alone cannot tell whether it is hiding an answer or simply does not have one. We borrow the Concealed Information Test, a forensic method that identifies guilty knowledge by presenting a suspect with the true detail among…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}