GPT-5.6 Closed a 30-Year Math Gap. Nobody Noticed.


On July 17, 2026, a post hit the top of Hacker News with 513 points and 328 comments. It linked to a Reddit r/math thread where a researcher detailed how GPT-5.6 Sol — guided by a carefully constructed prompt — proved that convex optimization over a standard function class requires Omega(d^2)...