Unverified50% confidenceDecision RuleExact time
Prompt caching divides prefixes by 'breakpoints', and the prefix must be byte-for-byte identical to hit the cache, so it is critical to put unstable content such as timestamps and random IDs in the suffix.
1
Sources
50%
Confidence
Long-term
Relevance
10/14/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedWhether prompt caching hits depends on byte-for-byte consistency of the request prefix; if even one character at the beginning differs, the entire cache is invalidated.76% similarUnverifiedPrefix caching improves inference efficiency by caching common prompt prefixes to reduce redundant computation.75% similarUnverifiedPrompt caching can avoid repeated charges for identical prefixes, because system prompts and retrieved document fragments tend to be highly repetitive across multiple conversation turns.73% similarUnverifiedWhen multimodal content intersects with the prefix caching mechanism, cache entries may be partially overwritten by the prefix, leading to data reference confusion or state inconsistency.72% similarUnverifiedPrompt Caching supports only prefix matching, and only repeated content placed at the very front can be reused; in engineering practice one should follow the principle of fixed content first and dynamic content last.71% similar
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