BM25 vs Embeddings: Why Your RAG Can't Find Error Code PGX-4012
This story is from 2026-09-25. It is preserved in the archive; the latest stories are on the live feed.
A support engineer pinged me with a screenshot. They had asked our internal docs bot "what does PGX-4012 mean?" and it answered, with total confidence, by explaining PGX-4021. Different error. Different fix. Same four digits, shuffled. The page for PGX-4012 was in the index. It was chunked fine. It…
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- 2026-09-25 05:29 · DEV Community — Machine Learning
BM25 vs Embeddings: Why Your RAG Can't Find Error Code PGX-4012