Anthropic emailed our org last week: prompt cache hit rate is low, and caching repeated content "could save up to 64% of direct API spend. " The email is careful with scope — direct API only, Claude Code excluded because it manages caching itself. I went to check what that 64% was made of.
Source: [Dev.to](https://dev.to/lizhuojunx86/your-cache-hit-rate-is-low-true-and-worth-016-30ie)