A third of web pages published since ChatGPT’s launch show signs of AI authorship, study finds
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- Pew Research found that 35% of web pages published after ChatGPT's November 2022 release show signs of AI authorship or heavy AI editing.
- Common Crawl archive data and Open Pangram's AI-detection technology underpinned the study; a July 2026 random sample of 10,000 pages showed about 10% with "significant signs" of AI authorship.
- .com domains showed AI authorship at roughly 10 times the rate of .edu or .gov domains (both around 1%); .org domains sat at 4.6%.
- Cloudflare recently reported that bot web traffic has overtaken human web traffic, a milestone the company reached sooner than it had estimated.
- Other supposed AI authorship tells — em dashes, Oxford commas, and phrasing like "it's not X, it's Y" — have also climbed on the web in recent years.
- Pew cautioned that AI-detection tools can misclassify pages, though at scale the data is likely "at least directionally correct."
Why it matters: The concentration of AI authorship in .com domains — roughly 10x higher than .edu or .gov — means anyone sourcing material from the open web is increasingly ingesting machine-generated content while authoritative domains remain comparatively human-curated. For researchers, journalists, and model trainers, that disparity offers a clearer signal than raw AI-prevalence headlines.
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