Tokens & Context Windows
Learn what a token is, how context windows fill up, and why cost and quality both hinge on context. Free, one sitting.
25Sessions
beginnerLevel
Core competency stack
Start Learning for Free↓ 5 modules, 25 sessions below
Learning Path
25 sessions. Open a chapter to see every session, its brief, and the tools you'll use.
Tokens are not words
Why text splits the way it does, and what that means for you.
How text becomes tokens
Walking through tokenization on real text.
Code and non-English text
Why some content costs far more tokens than others.
Counting tokens before you send
Estimating size without guessing.
Why letter counting is hard
A surprising weakness that falls out of tokenization.