Key News from Last Night and This Morning (June 28 - June 29)

Musk: Grok 4.5 enters private testing at SpaceX and Tesla, performance approaching or even surpassing Opus. Musk posted on X that the Grok 4.5 version, built on the 1.5T V9 f base model, has entered private testing within SpaceX and Tesla, with Cursor data added during supplementary training. Early evaluations show the model's performance has approached or may exceed Opus levels. Musk also noted that reinforcement learning (RL) continues to significantly improve model capabilities, and the Grok Build training framework is also being iteratively optimized. Additionally, Musk revealed that a new model trained entirely from scratch by SpaceX will be continuously released on a monthly basis this year. a16z co-founder: Zhipu GLM-5.2 is the first Chinese AI system to fully benchmark against top U.S. models. a16z