A third of scored preprints read as machine-written

Claim

Unslop scored 12,750 arXiv preprints and found a third read as machine-written, near 65% in computer science and under 1% in mathematics, where humans still write the prose and machines write the proofs.

Reported metric: 33% overall / 65% in CS

Reporting date: 2026-07-21 (not necessarily the event date)

Sources

Attribution and reporting linked by this record; links do not imply independent verification.

• Welcome to July 21, 2026 (theinnermostloop.substack.com)