I Built a Semantic Cache for RAG. The Hard Part Was Knowing When NOT to Cache.
This story is from 2026-10-09. It is preserved in the archive; the latest stories are on the live feed.
Every time a RAG application answers a question, it may need to retrieve documents and make an LLM call. But what happens when someone asks essentially the same question again? We could reuse the previous answer. The challenge is knowing when two questions are similar enough to share an answer—and…
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- 2026-10-09 15:46 · DEV Community — AI
I Built a Semantic Cache for RAG. The Hard Part Was Knowing When NOT to Cache.