Barret Zoph exits OpenAI after five months, departs enterprise

Barret Zoph has departed OpenAI five months after returning, OpenAI confirmed on June 19, 2026. He rejoined the company in mid-January to lead enterprise AI sales and posted a goodbye message in the company’s Slack channels, the company said; Zoph did not immediately respond to a request for comment.

What happened and when?

Zoph left OpenAI again after five months on the job, having rejoined in mid-January to run enterprise AI sales. OpenAI confirmed his departure and the company said he posted a goodbye message in internal Slack; he returned to OpenAI in mid-January alongside two other former employees.

The timeline in the public record: Zoph originally left OpenAI in the fall of 2024 to join Mira Murati’s Thinking Machines Lab as co-founder and CTO. He departed that role abruptly in January 2026 after reports of alleged misconduct involving an undisclosed relationship with a colleague, and Murati posted on X that Thinking Machines Lab had "parted ways" with Zoph and that he would be replaced as CTO. Soon after those events, Zoph and two other former OpenAI employees — Luke Metz and Sam Schoenholz — returned to OpenAI in mid-January; Fidji Simo, OpenAI’s CEO of Applications, wrote on X that she was "excited to welcome Barret Zoph, Luke Metz, and Sam Schoenholz back" and that the decision had "been in the works for several weeks."

What was Zoph’s role and recent history with OpenAI and Thinking Machines Lab?

He was hired back to lead OpenAI’s enterprise push, a key revenue-facing role as the company said it would focus on enterprise and coding ahead of its planned IPO. Before that return, Zoph had left OpenAI in fall 2024 to become co-founder and CTO of Thinking Machines Lab, the competitor launched by former OpenAI CTO Mira Murati. That stint ended in January 2026 amid reports of alleged misconduct and Murati’s post that the company had "parted ways" with him.

OpenAI positioned Zoph’s return as part of a small group of rehires; Fidji Simo publicly welcomed him alongside two colleagues. The company named him head of enterprise AI sales shortly after his mid-January return.

Why it matters

OpenAI has signaled a strategic focus on enterprise revenue in the run-up to a planned IPO, and Zoph’s brief tenure mattered because he was tapped to run that push. Losing someone placed in charge of enterprise sales five months after rehiring him suggests turnover and internal churn at a moment the company has said it is narrowing priorities toward core revenue drivers. The back-and-forth between OpenAI and Thinking Machines Lab also underlines personnel movement between the two organizations, including hires and returns that have been public and high-profile.

What to watch

Watch who fills the enterprise sales role and whether OpenAI names a replacement quickly, since the company had emphasized enterprise and coding as key revenue drivers before an IPO. Also monitor any further public statements from Zoph or OpenAI about the circumstances of his departure and whether more employees move between OpenAI and Thinking Machines Lab.