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arxiv_llm_reliability · Oct 28, 2026 · paper

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What Hallucinations Have We Measured? Semantic Illusion, Confabulation, and Expressed Uncertainty

arxiv.orgOct 28, 2026
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In brief

Hallucination remains one of the most critical challenges in deploying large language models (LLMs) reliably and safely. Yet the term is used inconsistently across the research community. We argue for a strict definition of hallucinations in LLMs. First, hallucinations should be

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What Hallucinations Have We Measured? Semantic Illusion, Confabulation, and Expressed Uncertainty

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