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What is a Context Window? Unlocking LLM Secrets

IBM Technology
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A clear explainer of context windows: the limited working space an AI model uses to read your prompt, conversation history, documents, and its own response. The useful idea is that AI does not “remember” everything in the human sense; it can only work with what fits into its current context. For knowledge workers, this explains why long conversations drift, why large documents can strain output quality, and why good AI work often depends on managing what information goes into the model.

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IBM Technology

IBM Technology

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  • A context window is the AI model’s working memory: the amount of information it can consider at one time.
  • Bigger context windows help with longer documents and conversations, but they do not remove the need to organise context clearly.
  • Context limits explain why AI workflows often need summaries, retrieval, chunking, or careful handoffs instead of dumping everything into one prompt.