I Audited 70 Companies' llms.txt Files. Most Don't Have One. The /llms.txt proposal has been around since late 2024. Two years in, every SEO blog has a tutorial on it. Every "GEO" thinkpiece mentions it as a checkbox. WP Engine has published five articles about it in the last month. Mintlify built a feature for it. What nobody's done is check whether the people who should have one actually do, and whether what they shipped is any good. So I ran a script over 70 sites — the AI labs, the docs platforms, the dev infrastructure giants, the modern SaaS darlings, the WordPress media — and pulled their /llms.txt . Here's what I found. TL;DR : 31 of 70 (44%) had a real llms.txt . The other 56% either returned 404, served an HTML fallback (SPA routes catching the path), or 403'd a bot. Of the 31 that exist, 12 (41%) don't follow the format llmstxt.org itself defined. File sizes range from 648 bytes to 280 KB — a 432× spread.…