I ran into a pretty funny instance just yesterday - I was upgrading my windows partition to windows 11 and I asked claude if there was any chance it could corrupt my linux partition in the process. claude confidently said that yes there was a known failure mode where if the recovery partition was not large enough for windows 11 it would silently resize it, damaging the neighbouring partition. it even told me what system command it used to do so.

I googled the command and when the gemini prompt came up I said that claude had told me it might be run during the upgrade and damage my linux partition. gemini said "there is no such argument to that program, the other AI is hallucinating, and here is the knowledge base article that probably caused it to go wrong", which was actually pretty impressive, and amusing in the way it used both the term "hallucinating" and the phrase "the other AI".