The 29-year-old founder of data-labeling startup Scale AI joined Meta after Chief Executive Officer Mark Zuckerberg overhauled his company’s AI efforts, including through a $14 billion investment in Scale that was widely viewed as a bid to recruit Wang.

Start-up founder Alexandr Wang has built Meta’s Muse Spark AI model, but doubts linger over whether the billionaire prodigy can close the gap with rivals.

The 29-year-old founder of data-labeling startup Scale AI joined Meta after Chief Executive Officer Mark Zuckerberg overhauled his company’s AI efforts, including through a $14…