Claude has the ability to accept uploads of PDFs and then answer questions about them. I just recently uploaded a PDF of a complex state tax law that had deleted portions and addendums and all kinds of stuff over 36 pages of legalese, and after a few test questions to see if Claude was able to do what I wanted, I started asking questions and getting answers (with references) for important things I needed to know about what my rights were, and what I could and couldn't do.
I never could have figured that out just reading through those pages.