AI Briefing35% of New Websites Are AI-Generated
Key point
Since 2022, **35%** of new websites have been classified as AI-generated or AI-assisted text.
Details
Researchers from Stanford, Imperial College London, and the Internet Archive analyzed web archives from August 2022 to May 2025 and found that the share of AI-generated or AI-assisted websites, which was nearly 0% before ChatGPT's launch, rose to 35% by mid-2025. Of the 6 hypotheses tested, only 2 were actually confirmed.
The researchers collected the earliest snapshot of each URL using the Wayback Machine CDX Server API and used Pangram v3 to determine whether content was AI-generated. They then validated monthly samples to compare changes in web writing style and content.
- Semantic diversity decreased.
- Writing became more positive and less verbose.
- No evidence was found of increased misinformation or reduced source citations.
The researchers plan to expand this metric into a tool for ongoing tracking and to conduct a more detailed analysis of variation by site type and language.
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