Anthropic Docs: what its llms.txt contains
Measured on 2026-08-03: 55.6 KB, 3 sections, 549 links. How that compares with the other 112 files we track, and what it implies.
Last updated:
The file
Anthropic Docs publishes an llms.txt at
https://docs.anthropic.com/llms.txt.
That URL redirects to https://platform.claude.com/llms.txt, which is where the file is actually
served. Worth knowing if you fetch it programmatically: a client that does not follow
redirects gets nothing.
The file declares itself as Anthropic Developer Documentation in its H1, and the host is categorised here as ai & ml. It was last fetched and parsed on 2026-08-03.
Measured structure
| Measure | Anthropic Docs | Corpus median | Percentile |
|---|---|---|---|
| Size | 55.6 KB | 14.0 KB | 81th |
| H2 sections | 3 | 7 | 26th |
| Links | 549 | 76 | 88th |
| Blockquote summary | Absent | 90 of 113 have one | n/a |
Percentiles are against the 113 files in this directory, not against the web. That population is deliberately weighted toward documentation platforms and developer tools, which is where the convention started, so treat it as a peer group rather than a norm.
Observations
- No blockquote summary. The specification puts a one-line summary directly after the H1, and 23 of the 113 files in this directory omit it. It is the single line an assistant is most likely to read first.
- 549 links is closer to a sitemap than to a curated index. The convention exists so a model can skip crawling everything; a list this long hands the selection problem straight back to it.
Comparable files
Closest in size within ai & ml, from the same weekly check:
- Together AI Docs: 53.4 KB, 2 sections, 325 links
- Groq Console: 61.8 KB, 0 sections, 150 links , no blockquote summary
- OpenRouter: 41.8 KB, 4 sections, 314 links
- Perplexity Docs: 40.9 KB, 3 sections, 193 links
How this was measured
Our checker fetches /llms.txt for every host in the directory, follows redirects, confirms
the response is Markdown rather than an HTML error page, and parses it with the same parser that powers
our validator. Sizes are of the served body, sections are H2 headings,
and links are Markdown links anywhere in the file. The run behind this page completed on 2026-08-03.
Want to check a file yourself, including this one? Paste the URL into the validator. To see how to find any site's file, see how to find a website's llms.txt, and for the full list see the directory of 113 verified files.