Meta CEO Mark Zuckerberg is continuing his aggressive recruitment campaign for new AI venture Meta Superintelligence Labs. After luring in staff from OpenAI, he has now targeted Thinking Machines Lab — a startup led by Mira Murati, OpenAI’s former chief technology officer, Wired reports.

According to data provided to the publication, more than a dozen people have received offers from Meta — one of which is reportedly worth more than $1 billion dollars over several years. None of the employees at Thinking Machine Labs have yet to accept.

Several candidates are said to be hesitant despite promises of large sums, open source and an ambitious AI vision. Some are reportedly uninterested in Meta’s focus on consumer products; others express skepticism about lab director Alexandr Wang’s experience.

Meta has disputed the data, but according to Wired‘s sources, Zuckerberg has personally contacted potential recruits via Whatsapp, followed by interviews with top executives within the company.