Caching: prefix caching, semantic caching and KV offload
Three different caches that are often confused: exact prefix KV reuse, semantic response caching, and tiered KV storage. Hit-rate maths, cost and latency savings, correctness and privacy pitfalls, cache-friendly prompt design and routing.
14 min·Verified 2026-11Pro+50 XP
"Caching" in LLM serving names three very different things. Keeping them apart prevents both missed savings and subtle bugs.
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