Pew Finds 35% of Post-ChatGPT English Pages Show Signs of AI Writing

Pew Research Center says about 10% of English-language webpages now show significant signs of AI authorship, a figure that rises to 35% for pages published since ChatGPT launched in November 2022. The study analyzed roughly 490,000 pages from Common Crawl, running the text through Open Pangram, an AI detection model built by Pangram Labs. The gap is stark by domain: .com pages show AI traces at about 10 times the rate of .edu and .gov sites, both near 1%, while .org sits around 4.6%. Pew says detection models can misclassify individual pages, and “significant signs of AI authorship” does not mean a page was written entirely by a machine. Still, the report says AI-style cues such as em dashes, Oxford commas, and words like “delve” and “testament” have become more common since 2023, and .com AI-authorship rates have climbed from about 1% in January 2021 to 9.35% in January 2026.