A study using Common Crawl data found that over one-third of English-language webpages published after ChatGPT's release show signs of AI authorship as of July 2026. Researchers analyzed nearly half a million pages with the Open Pangram detection tool, finding that 10% of all sampled pages displayed AI writing indicators. AI-authored content appeared most on .com domains, roughly double the rate on .org sites. Linguistic markers including em dashes, Oxford commas, and terms like "delve" increased significantly since 2023.
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