AI bot data: OpenAI and Anthropic rely heavily on llms.txt; Markdown pages only 50% of crawls

marclou · x · 2026-08-13

TrustMRR analyzed over 1 million AI bot visits in the last 30 days, finding that OpenAI and Anthropic heavily use llms.txt to answer users, index pages, and train models. Markdown pages are crawled about 50% of the time; AI bots still use HTML. The /mcp page is the most crawled by ChatGPT and Claude to answer users.

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