Tokens vs Characters
Characters count letters, numbers, punctuation, and spaces. Tokens are the chunks of text that the model uses internally. They are related, but they are not the same thing.
Why this difference matters
| Metric | What it measures | Why it matters |
|---|---|---|
| Characters | Literal text length | Useful for rough size checks and UI limits |
| Tokens | Model-processed text units | Usually the main driver of API cost and context usage |
Practical takeaway
Characters can help you estimate. Tokens usually determine billing. That is why a prompt that looks short in plain text can still use more tokens than expected.
How to stay safe
- Use a calculator before scaling a workflow.
- Shorten repeated instructions and boilerplate.
- Store reusable context carefully instead of pasting everything into every request.