AI glossary · Generative AI and LLMs
Context window
The context window is how much text an AI model can consider at once, including your messages, files and its own replies, measured in tokens.
Also called context length, context
In more detail
Everything the model can “see” in a conversation has to fit inside its context window: the system prompt, the chat so far, any documents you uploaded and the answer it is writing.
When a conversation grows past the limit, older parts are dropped or summarised, which is why a chatbot can “forget” something you said at the start of a very long chat. Larger windows let you work with long reports or whole codebases in one go.
Example
A model with a context window of 200,000 tokens can read roughly a 500-page book in a single request.
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