{
  "kind": "fact",
  "studySlug": "llmstxt-effect",
  "slug": "top-five-thousand-domain-adoption-is-still-only-sixteen-percent",
  "title": "Top 5,000 domain adoption is still only 16.1%",
  "description": "An analysis of the top 5000 cited domains reveals that only 16.1 percent have adopted the llms.txt standard.",
  "lastUpdated": "2026-03-14",
  "lastTested": "2026-03-14",
  "sourceStudyUrl": "/trakkr-research/llmstxt-effect",
  "sourceStudyTitle": "The llms.txt Effect",
  "claimIds": [
    "llmstxt-effect:top5k-adoption"
  ],
  "relatedSlugs": [
    "answer:does-llms-txt-help-you-even-if-it-does-not-raise-citations",
    "answer:should-you-prioritize-llms-txt-over-answer-infrastructure",
    "tracker:llmstxt-adoption-by-tier-tracker"
  ],
  "methodologySummary": "Built from HTTP scans of 37,894 AI-cited domains, linked to 337,362 citations and 882 citation snapshots in the Trakkr corpus.",
  "limitations": [
    "This is an observational study. It measures correlation with citation outcomes, not a controlled experiment.",
    "Adoption is uneven by sector, so raw averages can hide category concentration in SaaS and developer tooling.",
    "A null citation effect does not mean llms.txt has zero operational value for every workflow. It means the study did not find a measurable citation lift."
  ],
  "keywords": [
    "llms.txt",
    "llms txt effect",
    "AI citations",
    "does llms.txt work"
  ],
  "schemaHints": {
    "pageType": "Article",
    "includeDataset": true
  },
  "claim": "Among the top 5000 cited domains, llms.txt adoption stands at 16.1 percent.",
  "supportingMetrics": [
    {
      "label": "Top 5k adoption",
      "value": "16.1%",
      "detail": "Adoption among the top 5,000 cited domains."
    }
  ],
  "whyItMatters": "Strategists should note that the highest performing cited sites are not yet clustering around a universal llms.txt playbook, indicating that early adoption remains a differentiator rather than a baseline requirement for visibility.",
  "citationBlock": {
    "quote": "Among the top 5,000 cited domains, llms.txt adoption is 16.1%.",
    "attribution": "The llms.txt Effect - Trakkr Research",
    "url": "https://trakkr.ai/trakkr-research/llmstxt-effect/facts/top-five-thousand-domain-adoption-is-still-only-sixteen-percent"
  }
}