We analyzed 900,000 newly created web pages in April 2025 and found that 74.2% of them contained AI-generated content.
At Ahrefs, our machine learning team has built an AI content detector (codenamed bot_or_not). We’re about to release the AI content detector for Ahrefs customers to use, so we decided to put it through its paces with a question we’ve been dying to answer:
What percentage of new content is AI-generated?
We’re about to release our AI content detector as part of the Page Inspect tool in Site Explorer.
We used bot_or_not to analyze 900,000 English-language web pages that were newly detected by our web crawler in April 2025. We analyzed one page per domain (so we tested content from 900,000 different domains). Each page was categorized according to the percentage of the page our model detected as being AI-generated.
Here’s what our content detector found:
- 2.5% of pages were categorized as “pure AI.”
- 25.8% were categorized as “pure human.”
- 71.7% were categorized as a mix of the two.
Of those that contained a mix of AI and human content:
- 25.86% showed moderate AI use (11%–40% of the page content was categorized as AI)
- 20.50% showed substantial AI use (41%–70%)
- 15.51% showed dominant AI use (71%–99%)
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