Thinking machine laboratorythe AI ​​startup led by former OpenAI CTO Mira Murati, has lost one of its cofounders to Meta.

The Wall Street Journal reports it that artificial intelligence researcher Andrew Tulloch announced his departure to employees in a message on Friday. A spokesperson for Thinking Machine Labs confirmed Tulloch’s departure to the WSJ, saying he “decided to go down a different path for personal reasons.”

The WSJ reported it last August Mark Zuckerberg’s aggressive AI recruiting blitz it included a bid to acquire Thinking Machines Lab — and when that failed, Zuckerberg allegedly tried to lure Tulloch with a compensation package that could be worth as much as $1.5 billion over at least six years. (At the time, a Meta spokesperson said the WSJ’s description of the offering was “inaccurate and ridiculous.”)

Tulloch previously worked at OpenAI and Facebook’s AI Research Group.