Builder.ai went from a value of $1.5 billion to zero in a few months, amid questions over the sales of an A.I. product. Its downfall hints at a broader downturn.

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Beijing is taking an industrial policy approach to help its A.I. companies close the gap with those in the United States.

A four-day test in the Alaska wilderness shows how far the U.S. military and American drone companies lag behind China in the technology.

As China vies with Silicon Valley for primacy, Hangzhou, home to DeepSeek and Alibaba, is where its aspiring tech titans mingle and share ideas.