Elon Musk is pressing top AI labs and Chinese companies to cross-test their systems. He made the appeal while some in tech are asking for more caution around AI. Musk himself has put large sums into AI companies. Tesla stock fell after the appearance. Musk also appeared at the top of Forbes' annual ranking of the wealthiest Americans. He repeated his proposal to merge Tesla and SpaceX. On another front, reports say child sexual abuse material persists on X, even though Musk promised to address the problem.