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Apple Inc.’s top executive in charge of artificial intelligence models is leaving for Meta Platforms Inc., another setback in the iPhone maker’s struggling AI efforts.

Ruoming Pang, a distinguished engineer and manager in charge of the company’s Apple foundation models team, is departing, according to people with knowledge of the matter. Pang, who joined Apple from Alphabet Inc. in 2021, is the latest big hire for Meta’s new superintelligence team, said the people, who declined to be named discussing unannounced personnel moves.

To secure Pang, Meta offered a package worth tens of millions of dollars per year, the people said. Meta Chief Executive Officer Mark Zuckerberg has been on a hiring spree, bringing on major AI leaders including Scale AI’s Alexandr Wang, startup founder Daniel Gross and former GitHub CEO Nat Friedman with high compensation.

Meta on Monday also hired Yuanzhi Li, a researcher from OpenAI, and Anton Bakhtin, who worked on Claude at Anthropic PBC, according to other people with knowledge of the matter.

Meta declined to comment. Apple and Pang didn’t immediately respond to a request for comment.

At Apple, Pang had been running a roughly 100-person team responsible for the company’s large language models, which underpin Apple Intelligence and other AI features on the company’s devices. In June, Apple announced that those models would be opened up to third-party developers for the first time, allowing for a range of new iPhone and iPad apps.

But internally, the foundation models team has come under scrutiny from new leadership, which is exploring the use of third-party models, including from either OpenAI or Anthropic, to power a new version of Siri. Those internal discussions have soured some of the morale on the foundation models team, also known as AFM, in recent weeks.

While the company has explored a move to a third-party solution to power the AI in the new Siri, it has simultaneously been working on a new version of Siri based on the models developed by Pang’s group. Those models also power Apple Intelligence features that run on Apple devices including email and web article summaries, Genmoji and Priority Notifications.

The major departure, the most significant in Apple’s AI ranks since the company started working on Apple Intelligence a few years ago, underscores the heightened competition for talent in the emerging space. Meta has been making offers to the world’s top engineers worth many millions of dollars per year — significantly more than what the iPhone maker pays its engineers doing similar work.

Pang’s departure could be the start of a string of exits from the AFM group, with several engineers telling colleagues they are planning to leave in the near future to Meta or elsewhere, the people said. Tom Gunter, a top deputy to Pang, left Apple last month, Bloomberg reported at the time.

The foundation models team reports to Daphne Luong, a top deputy to AI senior vice president John Giannandrea. Earlier this year, Giannandrea was sidelined internally and saw Siri, robotics, Core ML frameworks and other consumer product-related teams stripped from his command. That came after a poor response to Apple Intelligence and frequent delays for new Siri features.

With Pang’s departure, the AFM team will now be run by Zhifeng Chen. In a change from a structure under Pang where most of the engineers reported to him directly, there will be a new organizational layout that includes multiple managers reporting to Chen, who will then have engineers reporting to them. People close to the team indicate that Chong Wang, Zirui Wang, Chung-Cheng Chiu and Guoli Yin could be possible managers in the new structure.

Apple’s AI strategy is now run primarily by Craig Federighi, Apple’s head of software engineering, and Mike Rockwell, who helped create the Apple Vision Pro headset and now leads engineering for Siri. For his part, Giannandrea is in charge of Apple’s AI research arm. In June, at its Worldwide Developers Conference, Apple’s own AI only got a small showing, appearing in new features for translating calls and text messages.

The few other AI features, including analysis of on-device screenshots and improved image generation, came courtesy of partners, including OpenAI and Google. The company also rolled out a new version of Xcode that can handle code completion by tapping into Claude and ChatGPT.