Apple Inc. Chief Executive Officer Tim Cook expressed cautious optimism about the flood of new artificial intelligence services, saying that while the technology has huge potential, there also are “a number of issues that need to be sorted.”

Speaking on an earnings call Thursday, Cook noted that Apple already uses AI across much of its lineup, including in features like fall detection on its smartwatch. The company will continue to add the technology to more of its products, he said, but on a “very thoughtful basis.”

The remarks suggest that Apple plans to tread carefully in a contentious area.