What is a hallucination in generative AI?

Answer

We say a generative AI has hallucinated when it has made something up, invented a "fact". Generative means productive, so every time you ask it a question it is producing, word-by-word and phrase-by-phrase, an answer. Most of the time, the connections it makes between words reflect reality. But sometimes, they do not. Crucially, the model does not know the difference. 

  • Last Updated Oct 10, 2025
  • Views 2
  • Answered By Heather Evans

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