Brex: what its llms.txt contains

The file

Brex publishes an llms.txt at https://brex.com/llms.txt. That URL redirects to https://www.brex.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 LLM documentation for Brex in its H1, and the host is categorised here as fintech. It was last fetched and parsed on 2026-08-03.

Measured structure

Measure	Brex	Corpus median	Percentile
Size	548.0 KB	14.0 KB	98th
H2 sections	15	7	87th
Links	2042	76	96th
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.
• 2042 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.
• At 548.0 KB this is large enough that a client with a modest context budget may truncate it. Sites in that position usually split the map from the content and put the bulk in llms-full.txt.

Comparable files

Closest in size within fintech, from the same weekly check:

• Adyen: 600.4 KB, 4 sections, 2609 links
• Adyen Docs: 397.2 KB, 28 sections, 2475 links
• Plaid: 335.8 KB, 52 sections, 1417 links
• Stripe Docs: 91.0 KB, 26 sections, 471 links , no blockquote summary

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.