Barret Zoph, who previously worked at OpenAI for five months, returned to the company in mid-January after becoming co-founder and CTO of Thinking Machines Lab. He has now left Thinking Machines Lab and is rejoining OpenAI, according to Wired. Fidji Simo, OpenAI’s CEO of applications, shared the news of Zoph’s rejoining in a memo to staff. Zoph told Thinking Machines CEO Mira Murati on Monday that he was considering leaving; he was fired by Thinking Machines on Wednesday. According to Wired, technology reporter Kylie Robison reported on X that Zoph was fired for unethical conduct. A source close to Thinking Machines alleged that Zoph had shared confidential company information with competitors, but WIRED was unable to verify the allegation. OpenAI does not share the same concerns about Zoph as Mira Murati. Theverge reported that Zoph departed from OpenAI after five months and returned to OpenAI in mid-January. Wired reported that Zoph and Luke Metz are leaving Thinking Machines Lab and rejoining OpenAI. Thinking Machines Lab is described as a fledgling AI lab and a competing AI company.