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Full evaluationGlossary · Updated Sep 2, 2026
Hallucination
When an AI model states something false or invented with confidence, such as a fake citation or a wrong fact.
Definition
Hallucinations occur because language models generate plausible continuations rather than verified truths. They are more common on obscure topics, precise numbers, citations, and questions outside the model's training data. Mitigations include grounding answers in retrieved documents, requiring citations, lowering creativity settings, and human review for high-stakes output.
Why it matters when choosing a tool
Every AI tool can hallucinate; the difference is how visibly it shows sources and how easily you can verify claims before relying on them.
Where you will meet it
AI Research & Search, AI Legal & Contracts, AI Customer Support
Related terms
Grounding · Citations in AI answers · Retrieval-augmented generation (RAG) · Guardrails
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