I just got into my first internship and the company wants to build a program that is fed up with daily pdfs with hundreds of pages and is capable of answering questions based on that. The program is supposed to process daily new information. I did some research and found RAG or LangChain, but i don’t know which is the better option if I want to reduce costs and maximize efficiency, is there any better option?

I haven’t tried anything just yet, I’m just starting.