Does llms.txt matter? What the data says
Lots of plugins and tools now generate an llms.txt file. Here's what it is, what the evidence shows, and our verdict.
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Short answer: not much yet. It’s cheap to have and won’t hurt, but there’s no good evidence it helps you get cited in AI answers today. We rate it Watch.
What llms.txt is
llms.txt is a proposed file that sits at the root of your site (yoursite.com/llms.txt). It’s written in Markdown and gives large language models a short summary of the site and a list of its most important pages, so a model doesn’t have to work through navigation menus, cookie banners and scripts to find the good stuff.
It looks something like this:
# Example Co
> Example Co makes commercial espresso machines and services them in New England.
## Products
- [Model S2](https://example.com/s2): two-group machine for cafes
## Support
- [Service plans](https://example.com/service): pricing and coverageIt’s a community proposal, not a standard from Google, OpenAI or Anthropic. None of them has committed to reading it.
What the data says
The best evidence so far comes from Ahrefs, which studied 137,000 domains. About 28% had an llms.txt file. But 97% of those files got zero requests in May 2026. Almost nobody, human or bot, was fetching them.
Google is clear on its side. Its 2026 guidance on AI search says you don’t need special AI files or markup to appear in AI Overviews or AI Mode (summary from Search Engine Journal).
Adoption is high for a simple reason: it’s easy. Yoast has generated llms.txt files on WordPress since mid-2025 and now on Shopify too, and Drupal has new modules for it. When a checkbox makes something, lots of sites end up with it.
Our verdict: Watch
Do this: if your SEO plugin or CMS generates an llms.txt for free, turn it on and move on. Check once that it lists your real key pages and nothing private.
Don’t do this: pay for an llms.txt service, hand-write and maintain an elaborate one, or treat it as your AI search strategy. The time is better spent on making your pages readable without JavaScript, answering real questions clearly, and tracking whether AI tools cite you.
Watch for: an AI company announcing that it reads llms.txt, or log data showing real crawler traffic to the file. If that happens, we’ll change the verdict and say so in the What Now digest.
What we do on SEOWhat.now
We publish one, generated from our content so it never goes stale, and we watch our server logs to see who requests it. We’ll publish what we find.