Verified75% confidenceFactTime unknown
BM25 remains the default ranking algorithm for mainstream search engines such as Elasticsearch and Lucene.
5
Sources
75%
Confidence
Long-term
Relevance
5/31/2026
First Seen
Sources
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Related Claims
UnverifiedBM25 (Best Matching 25) is a probabilistic retrieval function proposed in the Okapi system and remains the default similarity algorithm in Lucene/Elasticsearch to this day.71% similarUnverifiedModern search systems usually combine lexical ranking with other signals rather than replacing BM25, and BM25's reliability on exact matches is still difficult for vector retrieval to fully replace.68% similarVerifiedBM25 is a classic keyword retrieval algorithm based on term frequency statistics, which is complementary to vector retrieval.68% similar
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