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38% of 2026 arXiv papers flagged as AI-written, up from 20% in early 2025

·2026.11.15 04:34

Key point

Analysis of 13,500 papers across ten fields shows a doubling of AI-written text prevalence from early 2025 to late 2026.

Details

  • 38% of arXiv papers sampled in August–October 2026 are flagged as machine-written, compared to 20% in early 2025.
  • The study analyzed the full text of 13,500 papers from 2021 to 2026 across ten different scientific fields.
  • A clear upward trend is observed, with twice as many new papers flagged as AI-written in late 2026 compared to early 2025.
  • The findings are based on scoring the full text of the sampled papers to detect machine-written characteristics.
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