Use one text-heavy test prompt.
Run the same prompt each time so the quality shift is easier to spot.
- Open ChatGPT image creation.
- Use a prompt with books, labels, or interface text.
- Try: "Two open books lie on a desk. One is an elementary school Chinese language textbook and the other is an elementary school math textbook. The content on both books is clear and legible."
- Keep the prompt wording fixed for repeat checks.