A study by researchers at Imperial College London, Stanford University, and the Internet Archive found that approximately 35% of newly published websites by mid-2025 can be classified as AI-generated or AI-assisted, up from zero before ChatGPT launched in late November 2022. Over 20% of these pages are fully AI-written with no meaningful human editing detected. AI-generated sites showed a 33% increase in semantic similarity and positive sentiment scores 107% higher than human-written pages. However, four commonly cited concerns about AI content, including increased factual inaccuracies, showed no statistically significant correlation with AI prevalence according to the quantitative analysis.
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