The 1-hour cache fix for batches has a break-even you cannot see
Anthropic's batch docs tell you to swap the 5-minute prompt cache for the 1-hour one. The swap costs a 60 percent heavier write on every miss, and the hit rate it has to reach to pay for itself is 57.6 percent at the bottom of Anthropic's own published band and outside that band at the top. A correction to my own September post.
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