Study Finds 38% of New arXiv Papers Appear AI-Written

A scan of 13,500 arXiv papers from 2021-2026 found that 38% of papers sampled in Aug-Oct 2026 appear machine-written, rising to 62% in computer science, versus just 0.4% before ChatGPT. The author built a custom detector with controlled false positives after finding existing tools unreliable.

2026-11-15 ~ 2026-11-16 · 3 related posts

• 38% of new arXiv papers now flag as AI-written, up from 0.4% pre-LLM baseline — GenerativeFart · 2026-11-15
• 38% of new arXiv papers read as AI-written; CS hits 62% — kimmonismus · 2026-11-16
• A custom detector scanned 13,500 arXiv papers: 38% read as machine-written — kimmonismus · 2026-11-16