Glossary
Token
The unit models read and write; roughly three-quarters of an English word. Pricing and context limits are counted in tokens.
A token is a chunk of text produced by the model's tokenizer: common words are one token, rare words or code split into several. A million tokens is about 750,000 words of English. Different models tokenise the same text into different counts, so compare cost per task rather than per token.
Related terms
Context windowModel Context Protocol (MCP)PromptWeights
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