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Claude's Cache Has a Hidden 62.5-Minute Rule That Could Save or Cost You Thousands

Claude's Cache Has a Hidden 62.5-Minute Rule That Could Save or Cost You Thousands

May 18, 2026
Ryan Skidmore

Claude's prompt cache follows a hidden 62.5-minute break-even rule — refresh a cached prefix before expiry or pay full rewrite costs, a ratio-based threshold that scales into thousands of dollars for large, expensive models like Opus 4.7, while context compaction carries its own hidden costs requiring up to 65 future …

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