02/20/2026
Does your AI start to hallucinate when you feed it large amounts of text or big documents?
This happens because of something called "Context Window", which is the limit on how much information the model can process at one time.
To stop this from happening, keep these 5 things in mind:
1. Think of the context window as a moving spotlight. As you add more text to the chat, the spotlight moves forward, and everything behind it falls into darkness.
2. AI counts "tokens" (chunks of characters), not words. A complex spreadsheet with lots of numbers and symbols uses up the context window much faster than simple paragraphs of text.
3. While free versions struggle with long threads, "Pro" or "Team" subscriptions usually unlock significantly larger context windows, allowing the AI to analyze hundreds of files at once without crashing.
4. Even if a model can accept a massive document, its reasoning often gets worse as the context fills up. It is safer to break huge tasks into smaller, focused prompts.
5. Hidden formatting in PDFs or code snippets counts toward your limit. Pasting clean, plain text gives the AI more "brain space" to focus on your actual content.
This should make it easier for you to use AI without having to deal with hallucinations.