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| One Prefix, Two Prices | Write prefix once → read it back cheap | No | First call slower, then faster | Provider prefix cache | Low — one header | Stable system prompts, long docs, few-shot blocks |
| The Break-Even Curve | Cumulative cost vs number of reuses | No | Write slower, reads faster | Same request, cache header | Arithmetic, not plumbing | Deciding whether your traffic shape profits |