Why it matters

Prompt caching cuts cost + latency. Understanding shapes design.

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The architecture

Split into stable prefix + variable suffix.

Mark cache boundaries.

Provider caches prefix.

Prompt cache designStable prefixsystem + few-shotCache boundaryprovider markerVariable suffixuser + queryAnthropic uses cache_control markers; OpenAI auto-detects prefix; structure matters
Prompt cache pattern.
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How it works end to end

Anthropic: cache_control on message.

OpenAI: auto-cache identical prefix.

Google: context caching API.