How many referring domains do claude.ai and chatgpt.com have?

claude.ai has 54,268 referring domains and chatgpt.com has 84,540 in the Common Crawl web graph (release cc-main-2026-jul-aug-sep).

claude.ai vs chatgpt.com: domain authority

claude.ai has the higher authority score (75 vs 74) and chatgpt.com has 1.6 times as many referring domains. Both are among the highest-authority ai sites in our data (2026-10-03).

Metric	claude.ai	chatgpt.com
Authority score (0-100)	75	74
Referring domains	54,268	84,540
Web graph rank	#147	#537
PageRank position	#570	#649
Majestic Million rank	#661	#199
Traffic rank	Top 1K websites (Chrome)	Top 1K websites (Chrome)

Bold = the stronger value. Ranks: lower is better.

Tech stack and AI crawler policy

	claude.ai	chatgpt.com
Tech stack	–	–
AI crawler policy	Blocks some AI search; GPTBot blocked	Blocks some AI search; GPTBot allowed

More claude.ai comparisons

How the authority score is calculated

The score is the average of two parts, each from 0 to 100:

Rank part: 100 × (1 − log10(rank) / log10(N))^0.6, where rank is the domain's harmonic centrality position in the Common Crawl web graph (how close it is to every other domain through links) and N is the number of ranked domains (133,241,980).
Link part: 100 × log10(1 + referring domains) / 7, so 10 million referring domains = 100.

It is consistent across all 120 million domains in the data, so it is good for ranking and filtering lists. It is not Moz Domain Authority or Ahrefs Domain Rating. Referring domains count other domains that link to this one, not individual backlinks; no list of linking pages is included.

FAQ

Which has higher domain authority, claude.ai or chatgpt.com?: claude.ai has the higher authority score (75 vs 74) and chatgpt.com has 1.6 times as many referring domains. Both are among the highest-authority ai sites in our data (2026-10-03). Scores are from our open-data metric (0-100), not Moz DA or Ahrefs DR.
How many referring domains do claude.ai and chatgpt.com have?: claude.ai has 54,268 referring domains and chatgpt.com has 84,540 in the Common Crawl web graph (release cc-main-2026-jul-aug-sep).