Freeze prefix for prompt caching
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Freeze prefix for prompt caching A prompting tip to optimize token caching by keeping the system prompt and stable context identical at the start, and placing variable content at the end.
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Rule 3: Freeze your prefix.
Put your system prompt + stable project context at the very front, byte-for-byte identical every turn.
Put the changing, per-step stuff at the end.
This is what makes prompt caching actually save you money on Fable 5's higher token cost.
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