Why it matters

Embedding cache cuts embed API cost. Understanding shapes RAG efficiency.

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The architecture

Hash text.

Lookup embedding.

Return or compute + store.

Embedding cache flowText hashSHA256 chunkLookup embeddingRedis / DBReturn or embed APIcache missDocs stable; embedding calls repeatable; cache in Redis or vector store metadata
Embedding cache.
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How it works end to end

Store: Redis or vector store metadata.

Model version in key.

Persist for stable docs.