Elon Musk is pressing major AI research groups and Chinese companies to test each other's models. He issued the request while some people in the technology industry are calling for a pause in AI development. Musk himself has put large sums into AI companies. Tesla stock dropped after his remarks. Musk also appeared at the head of Forbes' annual ranking of the wealthiest Americans. He repeated the idea of combining Tesla and SpaceX. In a separate development, reports say abusive material involving children remains on X, even though Musk promised to address the problem.