GPT-4.5 passed a three-party Turing test in 2025 — four years ahead of Kurzweil’s 2029 bet. But the machine that crossed the line was not the one he predicted would.
Twenty years after Kurzweil predicted detailed models of hundreds of human brain regions by 2025, the deadline has arrived — and the delivery looks nothing like what he described.
Nine of ten neuroscience claims from 2005 held up. The tenth — brain scanning doubling yearly — hit the physics of blood flow and skulls, and Kurzweil concedes it in the 2024 book.
Kurzweil said global brain observation would arrive in the 2020s. In September 2025, 621,733 neurons across 279 brain areas, in Nature. Twelve neuroscience predictions, scored.
Kurzweil said we wouldn’t need to map every connection in the brain. The connectomics field disagreed and just spent a decade doing exactly that.
The cubic-millimeter human connectome arrived. The nanobots did not. A scorecard on twelve Kurzweil predictions about brain reverse-engineering.