One of the most senior figures at the world's most closely watched AI company is stepping back. Fidji Simo, whom OpenAI hired last year to lead its applications business, said she will move from that full-time job to a part-time advisory role, citing a chronic health condition, TechCrunch reported. She has said a period of medical leave earlier this year proved longer and harder than expected.
Who she is
Simo is not a typical tech deputy. She spent more than a decade at Meta building out Facebook's products and advertising, then ran the grocery-delivery company Instacart as chief executive from 2021, taking it public in 2023, CNBC reported. OpenAI recruited her in 2025 for a newly created position, CEO of Applications, to run the commercial side of the business, the products and operations that turn its AI research into revenue.
In that job she reported directly to OpenAI's chief executive, Sam Altman, and oversaw much of the company's operating leadership, making her effectively its number two on the business side. She had also joined OpenAI's board before taking the executive role.
What is changing
Simo is transitioning to a part-time advisory capacity rather than leaving entirely. During her earlier medical leave, OpenAI's president, Greg Brockman, took on responsibility for the product and applications work she had led, TechCrunch reported, and that arrangement points to how her duties are likely to be absorbed. Altman, in a note to staff, expressed sadness at the change and praised her contribution and character.
Out of respect, the specifics of her health are hers to share; the salient fact for the business is simply that a senior operator is stepping back from day-to-day leadership for medical reasons.
Why it matters
The timing is what makes this more than an ordinary personnel note. OpenAI is in the middle of a difficult, high-stakes transition from research lab to commercial powerhouse: scaling paid products, managing enormous spending on computing, navigating regulators, and reshaping its own corporate structure. Simo was brought in precisely to bring adult supervision to that commercial machine, and her experience taking a company public made her a natural voice as OpenAI contemplates its own eventual listing.
Losing that experience, even partially, at this moment is a real gap. It also adds to a pattern of senior churn at OpenAI, which has seen a number of high-profile departures over the past couple of years as the pressures of its breakneck growth and internal debates over direction have played out. A company moving as fast as OpenAI depends heavily on a small number of seasoned leaders, and each exit concentrates more weight on those who remain, above all on Altman himself.
None of this threatens OpenAI's momentum in the near term; the company has a deep bench and no shortage of ambition. But leadership continuity is one of the quieter things investors and partners watch in a firm this important, and this is a reminder that even the most closely followed company in tech is, in the end, run by people. This article is informational and not investment advice.
