OpenAI Hires Instacart's Fidji Simo as CEO of Applications

OpenAI has hired Instacart chief executive and current OpenAI board member Fidji Simo as CEO of Applications, a newly created role that puts a second chief executive inside the company and hands her the business and operational teams that carry OpenAI's research to hundreds of millions of users.

Sam Altman announced the move in a message to staff, which OpenAI published after what he described as a leak compressed the timeline. "I was hoping to do this in a few weeks but a leak accelerated our timeline," Altman wrote.

Simo will report directly to Altman, who remains CEO of OpenAI. In his message, Altman framed the hire as a structural response to how much the company has changed since its founding as a research lab with a mission to ensure artificial general intelligence (AGI) benefits everyone.

"Over the past two and a half years, we have started doing two additional big things," Altman wrote. "First, we have become a global product company serving hundreds of millions of users worldwide and growing very quickly. More recently, we've also become an infrastructure company, building the systems that help us advance our research and deliver AI tools at unprecedented scale."

Altman added a third pillar: "as discussed earlier this week, we will also operate one of the largest non-profits."

The appointment matters because it formalizes a division of labor at the top of one of the world's most valuable private companies as it attempts to scale three distinct businesses at once. Each of those efforts, Altman wrote, "could be its own large company," and OpenAI is "in a privileged position to be scaling at a pace that lets us do them all simultaneously."

What Simo will run

Applications brings together existing business and operational teams responsible for how OpenAI's research reaches and benefits the world. In practice, that means the consumer and commercial side of ChatGPT and related products, while Altman retains direct oversight of what he calls the three pillars of the company: Research, Compute, and Applications.

In her new role, Simo will focus on enabling OpenAI's "traditional" company functions to scale as the company enters what Altman called "a next phase of growth."

Simo is not a newcomer to OpenAI's inner circle. She has served on the OpenAI board for the past year, a position from which, Altman wrote, she "has already contributed a great deal to our company." Altman called her "uniquely qualified" to lead the Applications group and said she brings "a rare blend of leadership, product and operational expertise, and genuine commitment to ensuring our technology benefits everyone."

She will transition out of her role at Instacart over the next few months and join OpenAI later this year, according to Altman's message.

Simo's background is consumer product at scale. Before leading Instacart, she spent roughly a decade at Facebook, where she rose to lead the Facebook app, and she later chaired Instacart through its public listing. That resume matches the profile of a company whose ChatGPT products now serve a user base in the hundreds of millions and which is racing to convert that reach into a durable commercial business.

What Altman keeps

Altman was explicit that he is not stepping back from the company he co-leads. "I remain the CEO of OpenAI and will continue to directly oversee success across all pillars of OpenAI – Research, Compute, and Applications – ensuring we stay aligned and integrated across all areas," he wrote.

He also said he will "work closely with our board on making sure our non-profit has maximum positive impact," a reference to the restructuring OpenAI discussed earlier in the week, under which the nonprofit arm will continue alongside the commercial operation.

At the same time, Altman signaled where his own attention will concentrate. "In addition to supporting Fidji and our Applications teams, I will increase my focus on Research, Compute, and Safety Systems, which will continue to report directly to me," he wrote. He tied that shift directly to the company's stated ambition: "Ensuring we build superintelligence safely and with the infrastructure necessary to support our ambitious goals."

Altman closed the announcement with a line that doubles as the company's current self-definition: "We remain one OpenAI."

He also noted that "Fidji's leadership makes me even more optimistic about our future as we continue advancing toward becoming the superintelligence company we aim to be."

Simo shared a message of her own alongside the announcement, though its full contents were not included in the published note.

Why the structure matters

The move gives OpenAI a familiar Silicon Valley shape: a founder-CEO focused on research and long-horizon bets, paired with an operations-focused chief executive running the product and commercial engine. Microsoft, Google and Meta have all at various points separated research leadership from product leadership while keeping both under one roof.

For OpenAI, the stakes are unusually high. The company is simultaneously funding massive compute buildouts, shipping consumer products at a scale that rivals the largest internet platforms, and managing a corporate restructuring that keeps a nonprofit in control of the mission. Adding a CEO of Applications is a bet that a single leader dedicated to execution can keep the product business growing while Altman concentrates on superintelligence and safety systems.

The transition begins now, but Simo does not start until later this year, which leaves OpenAI operating with its current structure through a period in which it plans further infrastructure expansion and continued product releases. How much authority concentrates in the Applications role, and how cleanly the boundary between Altman's three pillars holds, will be the structure to watch as Simo arrives.