WordPress sites with a valid llms.txt file, by SEO plugin (October 2026)
| SEO plugin | WordPress sites | With llms.txt | Share | Top-1M share |
|---|---|---|---|---|
| All in One SEO | 357,296 | 133,519 | 37.4% | 42.1% |
| Rank Math | 606,443 | 122,920 | 20.3% | 21.8% |
| Yoast SEO | 2,100,794 | 296,658 | 14.1% | 19.3% |
| Slim SEO | 9,505 | 684 | 7.2% | 8.6% |
| The SEO Framework | 23,270 | 1,132 | 4.9% | 6.4% |
| No SEO plugin detected | 1,739,609 | 84,629 | 4.9% | 6.8% |
| All WordPress sites | 4,836,917 | 639,542 | 13.2% | n/a |
Source: PageSpeed Matters, Nov 2026. HTTP Archive mobile crawl, Oct 2026. Sites with two SEO plugins counted once.
Summary
An llms.txt file is a plain-text map of a site for AI tools: what the site is and which pages matter. On WordPress, few owners are likely to write one by hand. We wanted to know how many WordPress sites publish one, and whether that varies with the SEO plugin they run.
It varies a lot. 13.2% of 4,836,917 WordPress sites serve a valid llms.txt file. On sites running All in One SEO the figure is 37.4%, on Rank Math 20.3% and on Yoast 14.1%. With no SEO plugin detected it is 4.9%, so All in One SEO sites are about 7.6 times as likely to have the file.
What we measured
We used the HTTP Archive October 2026 mobile crawl of 4,836,917 WordPress homepages. A site counts as having llms.txt when the file exists at /llms.txt and passes the crawl's format check. The SEO plugin is detected from the code each homepage loads.
Sites running two SEO plugins, which is rare, are counted under the first match in the order Yoast, Rank Math, All in One SEO, The SEO Framework, Slim SEO. SEOPress is not detected separately. We also report the same split for WordPress sites in the top 1 million by Chrome traffic.
The file can also come from a dedicated llms.txt plugin or be uploaded by hand, so the split shows which plugin's sites have the file, not proof that each file came from the SEO plugin.
All in One SEO sites are the most likely to have an llms.txt file
133,519 of 357,296 WordPress sites running All in One SEO (37.4%) serve a valid llms.txt file. No other SEO plugin comes close.
A share that high on a plugin's sites likely reflects the plugin's own llms.txt feature and how readily its users switch it on. It is still a minority: nearly two in three All in One SEO sites have no file.
37.4%
Share of 357,296 WordPress sites running All in One SEO that serve a valid llms.txt file (HTTP Archive, October 2026).
Rank Math and Yoast sites sit in the middle
On Rank Math, 122,920 of 606,443 sites (20.3%) have a valid llms.txt file. On Yoast, the most installed SEO plugin by far, it is 14.1%, or 296,658 of 2,100,794 sites.
Because Yoast runs on so many sites, its users still publish the largest number of files: 46.4% of all valid llms.txt files on WordPress sit on Yoast sites.
Sites without an SEO plugin rarely have one
Only 84,629 of 1,739,609 WordPress sites with no SEO plugin detected (4.9%) serve a valid llms.txt file. The lighter plugins are close to that level: The SEO Framework at 4.9% (23,270 sites) and Slim SEO at 7.2% (9,505 sites).
The pattern suggests most WordPress owners get the file from a plugin rather than writing it by hand.
The gap holds among busier sites
Among WordPress sites in the top 1 million by traffic, every group is a little higher but the order is the same. All in One SEO sites reach 42.1% (6,449 sites), Rank Math 21.8%, Yoast 19.3% and sites with no SEO plugin 6.8% (31,959 sites).
So the split is not only small sites on default settings. Busier sites follow the same pattern.
Source: PageSpeed Matters. HTTP Archive mobile crawl, Oct 2026; WordPress sites in the top 1M by Chrome traffic.
Slim SEO and The SEO Framework have under 1,000 top-1M sites each.
What this means for your WordPress site
If you want AI tools to have a map of your site, check what your SEO plugin does today, because it is the most likely source of the file.
- Open yoursite.com/llms.txt. Many owners do not know whether their plugin publishes one.
- Review the settings after updates. SEO plugins add and change features often; check what a new version switched on.
- Read the file it generates. Make sure it lists your most useful pages, not tag archives or thin pages.
- Do not run two SEO plugins to get one feature. Overlapping plugins duplicate tags and slow the site.
As part of routine upkeep, our WordPress support services review your SEO plugin's settings after each update, check that its llms.txt and sitemap output list the right pages and remove overlapping plugins, so a version change does not quietly rewrite what AI tools see. On the pages that file points to, our on-page SEO services sharpen titles and openings, answer the main question early and update stale facts, so the pages on your map are ones AI answers can quote.
Sources
- PageSpeed Matters analysis of the HTTP Archive October 2026 mobile crawl (4,836,917 WordPress homepages)
- The llms.txt proposal: https://llmstxt.org
Frequently asked questions
Which WordPress SEO plugin creates an llms.txt file?
Sites on All in One SEO have one most often: 37.4% of 357,296 serve a valid llms.txt file, against 20.3% on Rank Math and 14.1% on Yoast. The file can also come from another plugin, so this shows association, not each plugin's default.
How many WordPress sites have an llms.txt file?
13.2% of 4,836,917 WordPress homepages (639,542 sites) served a valid llms.txt file in the October 2026 HTTP Archive crawl.
Do WordPress sites without an SEO plugin have llms.txt?
Rarely. Only 4.9% of 1,739,609 WordPress sites with no SEO plugin detected served a valid llms.txt file, and 6.8% of those in the top 1 million.