0.5T for now—hold the line; after 5 days, when the real 1T shows up, you can yell “Didn’t we just go back in time?” again.

Sources say that Grok 4.3 (beta) has been opened to top-tier subscribers, previously rumored to have 1T parameters and longer training times. Elon Musk clarified that this version is just a 0.5T update checkpoint, not a new 1T model; the true 1T flagship is expected to complete initial training in about five days, at which point it will achieve leaps in coding, long context, and various skills. The SpaceXAI model factory has been operational, and improved base models will be offline every two weeks for updates.