[Musk: Grok 4.3 beta is still a 0.5T intermediate training version, 1T flagship is 5 days away from initial training completion] According to a report by Jinse Finance, Grok 4.3 (beta) has been made available to users subscribed to the highest-tier SuperGrok Heavy. On the 17th, users noticed this version marked with 'Early Access' in the dropdown menu on (Grok.com). On the morning of the 18th, X user Mark Kretschmann posted that this version features 1T parameters, double the size of Grok 4.20, with significantly longer training times. xAI and Tesla CEO Elon Musk later clarified in the same thread that the current 4.3 (beta) is still a 0.5T model, merely an updated training checkpoint, and not the 1T new model speculated by the public. Musk also revealed that the true 1T flagship is approximately 5 days away from completing its initial training. He described the 1T model as achieving a step-change improvement in coding, long-context understanding, and various skills. He also mentioned that the SpaceXAI model factory is fully operational, and it is expected to roll out an improved foundational model every two weeks moving forward.