Anthropic Docs llms.txt: what the file contains
Measured on 12 October 2026: 81.0 KB, 4 sections, 760 links. How that compares with the other 124 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 12 October 2026.
Measured structure
| Measure | Anthropic Docs | Corpus median | Percentile |
|---|---|---|---|
| Size | 81.0 KB | 14.0 KB | 88% |
| H2 sections | 4 | 8 | 29% |
| Links | 760 | 71 | 92% |
| Blockquote summary | Absent | 107 of 125 have one | n/a |
Percentiles are against the 125 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 was detected. The proposal allows an optional summary after H1; only H1 is required. The same absence occurs in 18 of the 125 directory files.
- 760 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: 62.8 KB, 1 sections, 368 links
- W&B Docs: 57.8 KB, 6 sections, 412 links
- Mistral Docs: 57.4 KB, 7 sections, 301 links
- Groq Console: 55.2 KB, 0 sections, 133 links, no blockquote summary
How this was measured
The historical check followed redirects, rejected HTML responses and required an initial H1. It counted H2 headings and Markdown list links with regular expressions, rather than running the full validator. Counts and bytes describe the retained response text, subject to the extraction limit. This snapshot was generated on 2026-10-12.
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 125 verified files.