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Analysis: Only 15% of top websites serve valid llms.txt files

By PulseAugur Editorial · [1 sources] ·

A recent analysis of the top 1,000 websites reveals that only 15% of reachable sites actually serve an `llms.txt` file, despite a higher number responding with a 200 status code. The study found that many sites incorrectly report the presence of the file due to serving HTML pages, login screens, or general homepages instead of the intended text file. Furthermore, out of the sites that do serve a file, a significant portion do not adhere to the specified format, such as lacking an H1 heading or a linked list of URLs. AI

IMPACT Highlights inconsistencies in how websites are implementing AI-related metadata files.

RANK_REASON Analysis of website data regarding a specific file format.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Analysis: Only 15% of top websites serve valid llms.txt files

How we ranked this

Signal score
1 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Commentary
Analysis of website data regarding a specific file format.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, other
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
Standard
On-topic for AI-industry coverage; kept in the public index.
Story freshness
Same-day
Cluster formed today. Ranking reflects the current source set at time of score.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Mahiro Hirakawa ·

    246 of the top 1,000 sites answer /llms.txt with 200. Only 114 serve the file.

    <p>If you count llms.txt adoption by asking which sites return 200 for <code>/llms.txt</code>, you'll more than double the real number. I checked the top 1,000 domains today. 246 answered 200. 114 of them actually served an llms.txt file. The other 132 sent a login page, a "not f…

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