Desk limit reached or a lighter model wrote the reply

• “Desk’s daily limit is reached. It resets at midnight New York time.”, “Desk’s monthly limit is reached. It resets on the 1st.” or “Daily Desk message limit reached. It resets at midnight New York time.” By design: a dollar limit or the 200-questions-a-day cap.
• A line above a reply says a lighter model wrote it. By design: you passed the full model’s daily or monthly limit, or the shared monthly total ran out. The full model returns at the time the line gives.

See Desk limits and the lighter model.