Glossary
Tokenizer explained
How text is split into tokens — the unit you're billed on.
Why it matters for cost
The newer Opus/Fable/Sonnet-5 tokenizer emits ~30% more tokens for the same text, raising cost at the same rate.
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 tokenizer?
- How text is split into tokens — the unit you're billed on.
- How does it change what I pay?
- The newer Opus/Fable/Sonnet-5 tokenizer emits ~30% more tokens for the same text, raising cost at the same rate.