Elon Musk has called on leading AI laboratories and Chinese companies to test each other's models. He issued the request while various industry voices are asking for more caution around AI. Musk himself has major AI investments. Tesla stock dropped after his remarks. Musk also was listed at the head of Forbes' annual ranking of the wealthiest Americans. He brought up once more the notion of joining Tesla and SpaceX. In a separate development, reports say abusive material involving children continues on X, even though Musk committed to fixing it.