Krisztian Eyssen, Krisztian Eyssen Teaching AI Your Own Documents: RAG Explained Start with a 910-question benchmark: the same model scored **48.1%** out of the box, **50.4%** after fine-tuning, and **87.5%** with RAG. On another model fine-tuning did not help but **hurt** — from 35.3% down to 21.9%. So RAG is not one option among several: for new knowledge it is an order of magnitude better. It just happens **not to be teaching** — and most of the disappointment comes from believing that it is. Intermediate Business owner Explainer Data, RAG & Self-Hosted AI Sep 13, 2026
