hallucinate

verb

Etymology: First attested in 1604; borrowed from Latin hallūcinātus, alternative form of alūcinātus, perfect active participle of alucinor (“to dream”); see -ate (verb-forming suffix).

1. To seem to perceive things (with one or more of one's senses) which are not really present; to have visions; to experience a hallucination.
2. To produce information that is not supported by the model's training data.

   “In case you were wondering, the yahoo url above doesn’t actually exist, the model just hallucinated it.”

   “Despite maintaining plausible general linguistic capabilities, dialogue models are still unable to fully discern facts and may instead hallucinate factually invalid information.”