What is Context window?
A context window is the maximum amount of text (measured in tokens) an AI model can consider at once, including your prompt, any attached documents, and the conversation so far. If a conversation exceeds it, the earliest parts drop out and the model effectively forgets them.
A larger context window lets a model work with longer documents and remember more of a conversation. Claude is known for handling large context, which is part of why it is strong at document analysis.