What does 'context window' refer to in the context of Claude AI models?
Select an answer to reveal the explanation.
Short Explanation and Infographic
The context window is like the whiteboard a model can see — everything currently written on it (your input, conversation history, documents) plus what it writes back (the output) must fit on that board.
Full explanation below image
Full Explanation
A context window defines the total token capacity for a single API call, encompassing all input tokens (system prompt, conversation history, user messages, documents) plus the output tokens generated. Claude's context windows are measured in tokens, where roughly 4 characters equals 1 token for English text. Option A confuses context window with UI concepts. Option C is wrong because Claude does NOT have persistent memory across sessions by default — each API call is stateless. Option D describes request timeouts, which are separate infrastructure concerns unrelated to context windows.