Is llms.txt a ranking factor?
Short answer: No. No major search engine or AI provider has confirmed using llms.txt. It is cheap and harmless to add, but it will not move rankings or AI answers on its own.
No. As of 2026, neither Google nor any of the major AI providers has said that they read llms.txt, and there is no reliable evidence that adding one changes rankings or AI answers by itself.
llms.txt is a proposed convention: a Markdown file at the root of your site that summarises who you are and links to your most important pages, written for language models rather than people. It is well adopted among documentation sites and developer tools, and some agents and retrieval tools do look for it. But it is not a standard in the way robots.txt or XML sitemaps are, and it does not control crawling.
So why bother? Three reasons:
- It costs almost nothing. Twenty minutes and a text file.
- The exercise is valuable. Writing a clear, factual 300-word description of your business, with services, location, pricing and accreditations, is exactly the entity clarity that GEO depends on. Reuse the same text in your About page, your Organization or LocalBusiness schema and your directory profiles.
- Some tools check for it, including Seoptist's audit, as a signal that the site is being maintained with AI retrieval in mind.
What actually moves the needle is further up the list: allowing the right AI crawlers, valid structured data, consistent name/address/phone across the web, and service pages that answer the customer's question in the first paragraph.
Treat llms.txt as item twelve on the checklist, not item one. Seoptist generates one for you from your business profile and flags it when it is missing, unreachable or stale, but it will never be the reason you appear in an answer.