Why it matters

Semantic cache expands hit rate. Understanding shapes strategy.

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The architecture

Embed query.

Vector search cache.

Return cached if similarity above threshold.

Semantic cache patternEmbed queryvectorVector searchtop-1 similarityReturn or call LLMthreshold decisionThreshold 0.95+ common; user surprise if too loose; combine with exact-match
Semantic cache.
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How it works end to end

Threshold 0.95-0.98 typical.

TTL + freshness policy.

Metadata filter (user, tenant).