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Pew finds 35% of web pages published since ChatGPT's launch show signs of AI authorship
Pew Research Center published a study on August 20, 2026 analyzing roughly 500,000 English-language pages from Common Crawl over five years, using Pangram to detect AI authorship or heavy editing. A random 10,000-page sample from July 2026 showed about 10% with significant AI authorship signs; restricting to pages published after ChatGPT's November 2022 launch pushed that to 35%. The .com domain rate ran roughly 10x that of .edu and .gov (both ~1%), with .org at 4.6%. Pew flags that detection tools misclassify, but calls the aggregate directionally correct.
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