Elon Musk officially announced: Grok 4.5, built on the 1.5 trillion parameter V9 base model, has officially entered private beta testing within SpaceX and Tesla. xAI has fed exclusive data from the code-editing wizard Cursor into incremental training, directly targeting the Achilles' heel of top-tier closed-source models. 1.5T beast of a foundation: The V9 base model, with 1.5 trillion parameters, has already matched or even surpassed parts of Claude Opus in early evaluations. Hardcore physical optimization: The model is currently locked into frontline reinforcement learning (RL) within SpaceX’s rocket and Tesla’s electric vehicle engineering teams, paired with the ever-evolving Grok Build development suite. Insane iteration speed: Musk declared that SpaceX will release a brand-new model trained from scratch every month moving forward.