Lexical Search Python Packages

bm25s

Fast BM25 search in Python, powered by Numpy and Numba

flashrank

Lite & Super-fast re-ranking for your search & retrieval pipelines. Supports SoTA Listwise and Pairwise reranking based on LLMs and cross-encoders and more. Created by Prithivi Da, open for PRs & Collaborations.

bm25

Fast BM25 search in Python, powered by Numpy and Numba

laurus

Lexical Augmented Unified Retrieval Using Semantics

vrraj-bm25s-retriever

Lexical routing layer for LLM tool selection. Filter MCP-discovered and registry tools before prompt assembly using fast BM25S retrieval.

kfe

Cross-platform Search Engine and File Explorer for Multimedia

bm25-fusion

An ultra-fast BM25 retriever with support for multiple variants and meta-data filtering.