Claude Sonnet and Haiku found all 14 accessibility defects we planted in HTML, checklist or not. Without one, each fix sat inside a page of advice.
For problems that are visible in the markup itself, yes, and even a small model finds them. We planted 14 accessibility defects in short pieces of HTML and JSX, from an image with no alt text to a link hidden from screen readers while still reachable by keyboard. Claude Sonnet and Claude Haiku found every one of them with no instructions at all. The difference our checklist made was not what the models found but what they wrote around it: without it, a one-line fix arrived inside a review of about a thousand tokens, and correct markup got "should fix" advice too. The models without the checklist also caught a real failure our own first version missed.
Read the full report on AISkills402: https://aiskills402.com/blog/llm-accessibility-review-buried-fixes
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