500,000:1; ~25,000:1 to ~100,000:1; 3,700:1
In 2025, Anthropic's crawlers fetched up to 500,000 pages for every visitor they referred back, settling at about 25,000 to 100,000 per referral after May. OpenAI's ratio peaked at 3,700:1 in March.
Dated 15 Dec 2025Source checked 11 Oct 2026Quote found on its page again 16 Oct 2026Basis: stated
In the source's own words
“Anthropic had the highest crawl-to-refer ratios this year, reaching as much as 500,000:1, although they were quite erratic from January through May. ... After that, the ratios became more consistent, but remained higher than others, ranging from ~25,000:1 to ~100,000:1. OpenAI’s ratios over time were quite spiky, and reached as much as 3,700:1 in March.”
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