Reference · Glossary

Cosine similarity

Last updated Jul 17, 2026

A score from **-1 to 1** measuring how aligned two vectors are — common for comparing embeddings.

#When to use

RAG retrieval, duplicate detection, recommendation "more like this."

When you need literal string match — use keyword search or hybrid search.

Two similar sentences → embeddings with cosine ≈ 0.9; unrelated topics → closer to 0.