On Wednesday, OpenAI rehired former executive Barret Zoph after he was reportedly fired from Mira Murati’s AI startup, Thinking Machines Lab.

Conflicting Accounts Surround Zoph’s Exit

The development was first disclosed on X by technology reporter Kylie Robison, who said Zoph had been dismissed over what she described as “unethical conduct.”

On X, Murati acknowledged Zoph’s departure and announced that Soumith Chintala will step in as the startup’s new chief technology officer.

OpenAI Moves Quickly To Reclaim Talent

In a separate announcement shared on X, Fidji Simo, OpenAI’s CEO of applications, said Zoph and Luke Metz are returning to OpenAI. Zoph shared the post saying he is “super excited.”

A person familiar with Thinking Machines told Wired that Zoph was accused of sharing confidential company information with rival firms.

In a memo sent to staff by Simo and seen by the publication, Zoph informed Murati on Monday that he was contemplating leaving and by Wednesday, he had been fired.

Simo noted that OpenAI does not share Murati’s concerns regarding Zoph.

Zoph did not immediately respond to Benzinga’s request for comments.

Another Blow For Mira Murati’s Startup

The departures deepen challenges for Thinking Machines, a well-funded AI startup founded by Murati, OpenAI’s former chief technology officer.

The company also lost co-founder Andrew Tulloch to Meta Platforms, Inc. (NASDAQ:META) last year.

Thinking Machines, last valued at $12 billion, has been in talks to raise more than $4 billion at a $50 billion valuation.

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