B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
10.13%
10.13% -- llms txt adoption rate for Web domains (300,000-domain sample) (2026-05)
SE Ranking found a 10.13% llms.txt adoption rate across a study of 300,000 domains in May 2026.
Attribution:
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Lighthouse Research Team
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Source verified
Evidence graded
Value
10.13%
Unit
Percentage
Data Vintage
2026-05
Entity
Sample Size
300,000
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
SE Ranking
Primary
Tier C
https://sproutsagesolutions.com/llms-txt-complete-guide-2026/ ↗
Source Article
llms.txt Guide 2026, Spec, Examples, Mistakes | Sprout Sage
llms.txt, The Complete Guide for 2026
I have audited 40-plus client and competitor sites for llms.txt in the last six months. Roughly one in three had a file. Roughly one in ten had a file that actually followed the spec. The rest were sitemaps dumped into markdown or H3-littered files that LLMs par…
Original Research
SE Ranking
· Original study ↗
Methodology
SE Ranking study of 300,000 domains conducted May 2026, as cited by Sprout Sage Solutions; described as roughly one in ten sites.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Web domains (300,000-domain sample): 10.13% llms txt adoption rate. Source: SE Ranking (2026-05). Via Lighthouse Intelligence -- https://lighthousedata.io/data/se-ranking-llms-txt-adoption-300k-domains
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<blockquote cite="https://lighthousedata.io/data/se-ranking-llms-txt-adoption-300k-domains" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>10.13%</strong> -- llms txt adoption rate for Web domains (300,000-domain sample)<br><small>Source: SE Ranking (2026-05) · <a href="https://lighthousedata.io/data/se-ranking-llms-txt-adoption-300k-domains" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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