Stocks climbed in the US with investors buoyant about an expected rate cut, and new AI deals. Photo: AP PHOTO

All three major US stock indexes have posted record closing highs again as Nvidia shares gained following news it will build artificial intelligence supercomputers for the US energy department, and as investors were optimistic about corporate earnings ahead of key results from megacaps this week.

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Nvidia's CEO, Jensen Huang, said the company will build seven supercomputers for the US Department of Energy, and said the company has $500 billion in bookings for its AI chips.

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