The maker of ChatGPT once spurned the defense industry. Now, OpenAI has signed a deal with drone maker Anduril to use its technology in some of its systems. What does this mean for the AI company, and for Silicon Valley’s efforts to forge closer relationships with the Pentagon? WSJ reporter Deepa Seetharaman explains. Plus, why are weather apps inconsistent with forecasts? We’ll find out how to get more accurate predictions. Danny Lewis hosts.

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