Question

Does ChatGPT use llms.txt?

Updated June 7, 2026

There is no public confirmation that ChatGPT (or any major AI engine) uses llms.txt as a retrieval or ranking input. ChatGPT search relies on the Bing index plus live fetches by OAI-SearchBot and ChatGPT-User. Treat llms.txt as a low-cost curated source map, not a guaranteed channel.

What ChatGPT search actually uses

• The Bing index for discovery and grounding.
• OAI-SearchBot to index pages for ChatGPT search.
• ChatGPT-User to fetch a specific page on demand.

So is llms.txt useless?

No. It is cheap to maintain and gives you editorial control over which pages you point assistants to. But your visibility comes from crawlable, quotable pages and fast indexing — not from the file itself. Do not skip the fundamentals expecting llms.txt to carry you.

Where to spend effort instead

1. Clean, static, quotable source pages.
2. Allowed AI crawlers and verified access in logs.
3. Fast Bing indexing via IndexNow.
4. Then maintain a concise llms.txt as a bonus source map.

Related pages: does llms.txt help SEO, how to get cited by ChatGPT, the practical llms.txt guide.

Generate your llms.txt