Paste any long non-sensitive document into a chat tool. Ask: 'What does [one specific section] say about [one topic]? Quote the exact sentence you're relying on.' You're done when you've checked the quote against the real document — found or fabricated.
How-to · INT · INT.2
Long doc Q&A — anchor your questions
Asking section-anchored questions about a long document beats 'summarize this' for accuracy and checkability.
Worked example
Summarize this 40-pager' invites mush. 'What does Section 7 commit us to — and quote the sentence' invites an answer you can check. Anchored questions force the model to point at the text, and they make its misses visible.