Semantic Caching for LLM Calls in Node.js With pgvector
This story is from 2026-10-09. It is preserved in the archive; the latest stories are on the live feed.
A semantic cache turns each incoming prompt into an embedding and searches pgvector for an earlier prompt that means the same thing. If the similarity is above a threshold you set, it returns the stored answer and skips the model call. Done well, it makes repeat questions faster and cheaper to answ…
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- 2026-10-09 04:04 · DEV Community — AI
Semantic Caching for LLM Calls in Node.js With pgvector
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