MUSK SAYS GROK 4.5 ENTERED PRIVATE BETA

Summary from the TLDR AI newsletter

Elon Musk said Grok 4.5 was in private beta at SpaceX and Tesla. The model is based on a 1.5T V9 foundation model with Cursor data added during supplemental training. Early evaluations were near or above Opus, with reinforcement learning still improving the model.