Glossary
What is an API token?
An API token is a piece of text, not a login credential. Input tokens are what you send. Output tokens are what the model writes. Cache tokens are prefix tokens stored and read again on a later turn.
Create account Token cost calculator
Definition
An API token is a piece of text, not a login credential. Input tokens are what you send. Output tokens are what the model writes. Cache tokens are prefix tokens stored and read again on a later turn.
Where to use it
Next page: Token cost calculator.
Details
- What is an API token?
- An API token is a piece of text, not a login credential. Input tokens are what you send. Output tokens are what the model writes. Cache tokens are prefix tokens stored and read again on a later turn.
Related
- Token cost calculator — Price those token classes for a month of agent use.
- Glossary — Short definitions that link to setup, pricing, and usage pages.
- GPT-5.6 Sol — A concrete model page that uses these terms.