OpenAI’s halo effect crowns a new AI kingmaker, shaking up a space once ruled by Nvidia’s Jensen Huang. AMD’s Lisa Su rides early gains as tech euphoria lifts markets to record highs. Meanwhile, AI euphoria and a big tech rebound push the Nasdaq and S&P to record highs, though futures signal a pullback as Wall Street reacts to a new warning from a famed investor. And finally, in Washington, the shutdown hits day seven, raising fears of an economic shock.

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