Gary Marcus is the most prolific AI skeptic on the internet. Since May 2022, he's published 474 posts on Substack making claims about AI's limitations, the companies building it, and where the industry is headed. We extracted every testable claim. 2,218 of them. Scored each one against the evidence as of March 2, 2026. Here's what the data shows. He's more right than wrong Among claims where the evidence is checkable: 59.9% supported 33.7% mixed 6.4% contradicted That's not the number most peopl...