Models

Token

A small unit of text that a model reads or writes.

Plain-English explanation

Tokens can be words, word pieces, punctuation, or characters. Context length, pricing, and output limits are usually measured in tokens.

Why it matters

Token matters because it affects how AI systems are designed, evaluated, priced, or trusted. Knowing the term helps you ask better questions and avoid vague implementation decisions.

Ask how it changes quality, cost, speed, or safety.
Look for concrete examples in the workflow you are building.
Document the tradeoff before choosing a tool or architecture.