Lots of comments in here that seem to have missed that this is about using vision-LLMs for OCR.

This makes it a slightly different issue from "hallucination" as seen in text based models. The model (which I think we can assume is GPT-5-mini in this case) is being fed scanned images of PDFs and is incorrectly reading the data from them.

Is this still a hallucination? I've been unable to identify a robust definition of that term, so it's not clearly wrong to call a model misinterpreting a document a "hallucination" even though it feels to me like a different category of mistake to an LLM inventing the title of a non-existent paper or lawsuit.