reasoning-models

On June 16, GLM-5.2 became the leading open-weight model on the Artificial Analysis Intelligence Index v4.1 at **51**, ahead of every Google model and **3.4 months** behind the equally-capable closed model. The smallest gap on record is now **2.2 months** (DeepSeek V4 Pro). The peak was **9.8 months** in December 2024. The reasoning frontier the closed labs owned outright is now a quarter-year head start, priced in the open.