KV-cache reuse for static prefixes — cache keys, TTL, and 90% token discounts.
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mediumSystem Design
Prompt caching in 2025: how do you cut cost with Anthropic & OpenAI caches?
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01
Understand the problem
prompt-cachingcost
02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
Nudge consolestandby
Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.
03
Study the solution
Put static prefix (system, few-shot, large context) first. Anthropic needs explicit cache_control breakpoints (5m TTL, 90% off cached reads); OpenAI caches automatically. Hit rate is everything.
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