---
title: "Discussion on \"BM25 vs vector vs RRF hybrid on 85 chunks — vector MRR won (hybrid did not “always win”)\" | Hashnode"
description: "Discussion on \"BM25 vs vector vs RRF hybrid on 85 chunks — vector MRR won (hybrid did not “always win”)\". Canonical: Hybrid BM25 + vector precision on eWorld.liveCheck date: 2026-09-26 PT · API spend $0 (CPU)\nSelf-built 85-chunk Northline Hybrid Lab + 15 graded queries (5 keyword / 5 semantic / 5 mixed)."
url: "https://hashnode.com/posts/bm25-vs-vector-vs-rrf-hybrid-on-85-chunks-vector-mrr-won-hybrid-did-not-always-win/6aba823f6bc54870afdb7bbe"
---

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Discussion

# [BM25 vs vector vs RRF hybrid on 85 chunks — vector MRR won (hybrid did not “always win”)](https://eworldlive.hashnode.dev/bm25-vs-vector-vs-rrf-hybrid-on-85-chunks-vector-mrr-won-hybrid-did-not-always-win?utm_source=hashnode&utm_medium=feed)

Canonical: Hybrid BM25 + vector precision on eWorld.liveCheck date: 2026-09-26 PT · API spend $0 (CPU) Self-built 85-chunk Northline Hybrid Lab + 15 graded queries (5 keyword / 5 semantic / 5 mixed).

Sep 28 · 1 min read · eworldlive.hashnode.dev  
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-   [#rag](https://hashnode.com/tag/rag)
-   [#bm25](https://hashnode.com/tag/bm25)
-   [#hybrid-search](https://hashnode.com/tag/hybrid-search)
-   [#rrf](https://hashnode.com/tag/rrf)
-   [#embeddings](https://hashnode.com/tag/embeddings)

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