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AI is an expensive business, costing upwards of $100 million simply to train a new model.

At Microsoft, though, a investment in AI appears to be paying off: CEO Satya Nadella said on a on Wednesday that Microsoft’s AI business “is on track to surpass an annual revenue run rate of $10 billion next quarter” and become “the fastest business in our history to reach this milestone.”

The projects revenue over a period of time based on previous revenue.

Related: Will It Take Nuclear Power to Sustain AI? Microsoft Is Betting on It.

Microsoft has invested about into OpenAI, the company behind ChatGPT. It has also made several AI commitments, including a deal to reopen Three Mile Island, a nuclear power plant near Harrisburg, Pennsylvania.

Nadella also pointed out on the call, which went over earnings for , that Microsoft Cloud revenue was up 22% year over year, growing to $38.9 billion for the quarter ending September 30. increased 16% to $65.6 billion.

At Microsoft, “AI-driven transformation is changing work, work artifacts, and workflow across every role, function, and business process,” Nadella said.

Though Microsoft’s earnings were better than expected, the company’s shares on Thursday because its predicted cloud revenue growth was less than expected.

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Nadella was well-compensated for leading Microsoft: He received of over $30 million for the fiscal year ending June 30, resulting in an overall pay of $79.1 million compared to $48.5 million a year prior.

Nadella’s compensation would have been , but he asked for it to be lower following a series of .

Meanwhile, Microsoft went through layoffs affecting in its gaming division in January.

Microsoft now has employees globally.