OpenAI Chief Executive Officer Sam Altman briefed US policymakers on the need to continue investing heavily in physical infrastructure to support future artificial intelligence development, days after the frenzy around Chinese upstart DeepSeek cast new doubt on AI spending. In a closed-door gathering in Washington on Thursday attended by officials from Congress and the White House, Altman said the rise of DeepSeek shows “it’s a really good thing” to push ahead with the $100 billion joint infrast...