Elon Musk has revealed that SpaceXAI will release its latest AI model, Grok 4.5, to the public following beta-phase testing, citing strong positive customer feedback. The announcement comes as the AI race intensifies with Anthropic’s release of Fable 5 and Mythos 5 last month, and the imminent launch of OpenAI’s GPT-5.6, which includes models named Sol, Terra, and Luna launching publicly tomorrow after approval from the Commerce Department. Developer Tetsuo noted that the Grok 4.5 model runs on V9, xAI’s new 1.5-trillion-parameter foundation model, roughly three times the size of the v8-small architecture behind Grok 4.3, and is the largest model the company has shipped, trained on Blackwell GPUs at the Colossus cluster in Memphis. Tetsuo further noted that coding is the clear focus, with SpaceXAI adding Cursor’s developer data to supplemental training, and that reinforcement learning has been improving the model daily. The next foundation model, already in training, will include Cursor data from the start of pre-training.