openai.com vs anthropic.com: domain authority
openai.com has the higher authority score (80 vs 73) and openai.com has 3.2 times as many referring domains. Both are among the highest-authority ai sites in our data (2026-10-03).
| Metric | openai.com | anthropic.com |
|---|---|---|
| Authority score (0-100) | 80 | 73 |
| Referring domains | 176,193 | 55,398 |
| Web graph rank | #84 | #585 |
| PageRank position | #279 | #574 |
| Majestic Million rank | #134 | #485 |
| Traffic rank | Top 5K websites (Chrome) | Top 50K websites (Chrome) |
Bold = the stronger value. Ranks: lower is better.
Tech stack and AI crawler policy
| openai.com | anthropic.com | |
|---|---|---|
| Tech stack | – | Webflow, GSAP, Cloudflare, YouTube and Sanity |
| AI crawler policy | Open; GPTBot allowed | Open; GPTBot allowed |
More openai.com 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, openai.com or anthropic.com?
- openai.com has the higher authority score (80 vs 73) and openai.com has 3.2 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 openai.com and anthropic.com have?
- openai.com has 176,193 referring domains and anthropic.com has 55,398 in the Common Crawl web graph (release cc-main-2026-jul-aug-sep).