Glossary · Phase 1 · Building with LLMs
Token
A chunk of text a model reads and writes, often a word or part of a word. Models count and charge by tokens.
Learn it properly
Tokens and the context window · How text becomes tokens, and what fits in one request. About 25 minutes.
Other terms from the same lesson
- context window: The most text a model can take in at once, measured in tokens: its short-term memory.
- proxy: A server that passes your requests on to another service, often adding the secret key so it never reaches the browser.
- token ID: The number a tokenizer gives each token. Models work with these numbers, not with the text itself.
- tokenization: Splitting text into tokens, and turning each into a number the model can use.