Elon Musk has urged top AI labs and Chinese companies to test each other's models. He made the appeal while various industry voices want a pause in AI development. Musk himself has put large sums into AI companies. Tesla shares dropped after the appearance. Musk also was listed at the head of Forbes' annual ranking of the wealthiest Americans. He again raised the idea of combining Tesla and SpaceX. Separately, reports say sexually abusive imagery of children persists on X, even though Musk committed to fixing it.