Elon Musk is pressing leading AI laboratories and Chinese companies to test each other's models. He made the appeal while some people in the technology industry want more caution around AI. Musk himself has major AI investments. Tesla stock dropped after the appearance. Musk also featured at the head of Forbes' yearly list of the wealthiest Americans. He repeated the notion of joining Tesla and SpaceX. On another front, reports say child sexual abuse material persists on X, even though Musk committed to fixing it.