> I am surprised by how much the really giant models hallucinate, though. My vague feeling was that little models hallucinate a lot because they just don't know anything (the world's knowledge simply does not fit in a few GB) and don't know how to say, "I don't know". But, the big models kinda do know everything, and yet, here we are, they're still making shit up all the time.

In my mostly unscientific RAG experiments I found that larger models were more likely to hallucinate in a RAG setting. I think that it's because they have more world knowledge. As an example, when asking about safety legislation in Ireland, Claude got hooked on the notion that OSHA was involved, which clearly is not true, while the smaller models just said that they couldn't find any information (which was the correct answer).