Apple’s longtime artificial intelligence chief is leaving as the iPhone maker and its Siri voice assistant scramble to play catchup with AI rivals, the company said.

John Giannandrea, who had served as Apple’s senior vice president of machine learning and AI strategy since 2018, has stepped down — months after a long-planned AI overhaul of the Siri voice assistant got delayed by bugs and glitches – a situation one executive reportedly called “ugly.”

Amar Subramanya, a veteran of Google and Microsoft, will take over as Apple’s vice president of artificial intelligence and oversee the teams developing Apple’s in-house AI models, machine learning research and AI infrastructure. He will report to Apple’s software boss Craig Federighi.

“AI has long been central to Apple’s strategy, and we a

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