More Documents, Same Length: Isolating the Challenge of Multiple Documents in RAG

Shahar Levy, Nir Mazor, Lihi Shalmon, Michael Hassid, Gabriel Stanovsky

More Documents, Same Length: Isolating the Challenge of Multiple Documents in RAG: 13 upvotes on Hugging Face Daily Papers, #6 of 22 papers on 2025-03-13. Day-by-day upvote history.

Retrieval-augmented generation (RAG) provides LLMs with relevant documents. Although previous studies noted that retrieving many documents can degrade performance, they did not isolate how the quantity of documents affects performance while controlling for context length. We evaluate various language models on custom datasets derived from a multi-hop QA task. We keep the context length and position of relevant information constant while varying the number of documents, and find that increasing the document count in RAG settings poses significant challenges for LLMs. Additionally, our results indicate that processing multiple documents is a separate challenge from handling long contexts. We also make the datasets and code available: https://github.com/shaharl6000/MoreDocsSameLen .

Paper page on Hugging Face · arXiv

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