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.

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.

Nvidia also announced new details with Finnish telecom equipment maker Nokia to target the AI communications market.

Microsoft's shares also gained after the company reached a deal that allows OpenAI to restructure into a public benefit corporation while giving Microsoft a stake of 27 per cent in the ChatGPT maker.

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