I need an AI service (even a paid one) that can receive as input long documents.

Hello!

I have many long documents (500+ pages) that I would like to have summarized. I would also like to chat with an AI bot in order to understand those texts better.

Is there an AI service that is right for me? Paid ones are fine, as long as they work.

I am currently using Claude 2.0, but I have to split PDFs into many parts, and it is too laborious a process.

Thank you in advance.