Elon Musk is pressing leading AI laboratories and Chinese companies to test each other's models. He made the appeal while some in tech are asking for a pause in AI development. Musk himself has put large sums into AI companies. Tesla shares slid after the appearance. Musk also featured at the peak of Forbes' annual ranking of the wealthiest Americans. He repeated his proposal to merge Tesla and SpaceX. On another front, reports say abusive material involving children remains on X, even though Musk promised to address the problem.