Cache the prefix for cheaper and faster prompts
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Jul 26, 2026
Cache the prefix for cheaper and faster prompts A prompt engineering tip to leverage caching by keeping the prefix static and placing variable content at the end.
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Cache the prefix. Keep the start of every prompt identical so it stays cached (about 10x cheaper). One changing character at the top, like a timestamp, kills the whole discount. Put anything that changes at the bottom. Saves 70% cost and lowers latency.
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