Factual info specifically looking for a link of something obscure where lots of similar (but incorrect) links exist.

E.g. "what is the IMDb link for the film Ghost Fever?"

Throwing that in Chatbot Arena will usually result in a random link back or the model will say it can't do it. GPT-4o gave a random link, Claude said it couldn't do it, oddly geneini-advanced-0514 got it right, so hard to tell if they are using Google in the background or if they do better.

But yeah usually IMDb links come back right for big films but tend to be hallucinated for smaller ones. That's just an example.