Glossary
Cache read vs cache write explained
The difference between paying to store context (write) and paying to reuse it (read).
Why it matters for cost
Write: 1.25x input (5-min) or 2x input (1-hour). Read: 0.1x input on most Claude models, 0.05x on Opus 5.5, 0.025x on Fable 5.1.
How JP the Cat surfaces it
JP the Cat reads the real token counts behind this from the local logs on your Mac and prices them at the shipped rates — so it shows up in your actual cost, not an estimate.
Common questions
- What is cache read vs cache write?
- The difference between paying to store context (write) and paying to reuse it (read).
- How does it change what I pay?
- Write: 1.25x input (5-min) or 2x input (1-hour). Read: 0.1x input on most Claude models, 0.05x on Opus 5.5, 0.025x on Fable 5.1.
See it in your real numbers
JP the Cat prices your actual local usage at the shipped rates — not an estimate.
Download MeowPrefer Homebrew? Install the same signed, notarized app from JP's public tap.
brew tap 8bittts/jpthecat
brew trust 8bittts/jpthecat
brew install --cask jpthecat