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AI-discovery file at /llms.txt: a curated markdown map of a site written for language models.
Jeremy Howard published the proposal in September 2024, and its own text says OpenAI, Anthropic and Gemini post llms.txt files for their developer docs. It remains a proposal to standardise rather than a ratified standard. Our match needs a markdown H1 at the top of the file.
Sources: The llms.txt proposal · Checked 16 Oct 2026
The ## headings in the files we read, by how many sites use each.
Share of the sites we scanned each month that had llms.txt.
Each links to the site's report, where the whole file is shown.
Showing the first 120. Search to narrow them down.