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What is Context Window?

A plain-English explanation of Context Window (Context Window) — what it means, why it matters, and how it is used in AI.

Context Window
Context Window
The context window is the maximum amount of text — measured in tokens — that an AI model can see and consider at one time when generating a response. Everything outside the context window is invisible to the model.
"A model with a 128,000 token context window can read and reason about an entire book in a single prompt."

Also known as: Context length, context size, input window

TokenLLMMemory

Why does Context Window matter?

Context window size matters when summarising long documents, analysing large codebases, or maintaining long conversations.

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TokenLLMMemory