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Independent researchPew Research Center, 20 Aug 2026

Over a third of pages published since ChatGPT's release showed signs of AI authorship when sampled in July 2026

Content production

33%+

of English-language webpages published after ChatGPT’s release showed AI authorship signs in July 2026

Reader Note:
The window opens at ChatGPT's release in November 2022 and the pages were sampled in July 2026, so this covers everything published across those three and a half years rather than anything recent. Worth comparing with the 10% of all English-language pages showing strong signs in the same sample: the two differ both in the window and in the strength of signal required, so they are not two readings of one number.
Evidence:
Observed behaviour
Vendor interest:
None
Sample:
Analysis of about 490,000 English-language webpages from the Common Crawl web archive over the past five years, including a random sample of 10,000 webpages from July 2026.

Good for

Comparing yourself against a similar segment, and choosing what to test next.

Not for

  • Saying that one thing caused another, or predicting what you would get.
  • This is an aggregated or average number that covers very different cases. Real results in a particular segment may differ.
  • Nobody counted this directly — it's a calculation. The publisher worked it out itself, or took the ad platform's word for what its ads achieved.
  • The source never says how this number was measured.

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