Unverified50% confidenceCautionExact time
A prompt cache hit requires the request prefix to be byte-for-byte identical to what was written at cache time; mixing dynamic content such as timestamps or session IDs into system prompts will cause frequent cache invalidation.
1
Sources
50%
Confidence
Long-term
Relevance
10/11/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedPrompt Caching refers to LLM service providers caching repeatedly occurring prefix content in requests, with cache hits reducing computational cost and latency.74% similarUnverifiedPrefix caching leverages the fact that the system prompt and conversation history remain unchanged across turns in long conversations, saving the KV cache of the fixed prefix for reuse in new turns to avoid redundant computation.74% similarUnverifiedThe cache key is composed of the model version, system prompt, tool definitions, and conversation history, and any change in any of these dimensions will invalidate the cache.72% similarUnverifiedClient-side caching is only effective for completely identical inputs, while KV Cache excels at handling scenarios with repeated prefixes; using both in combination can cover a wider range of repetition patterns.71% similarUnverifiedPersistent KV caching serializes key-value vectors to disk or object storage, allowing historical context across sessions and requests to be loaded directly, bypassing recomputation.71% similar
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