Fidji Simo Steps Down From OpenAI’s No. 2 Role

In a significant leadership shake‑up at one of the world’s most valuable technology firms, Fidji Simo, OpenAI’s second‑in‑command executive, is stepping down from her full‑time position, according to a report from The Wall Street Journal. The announcement comes on the same day the company launched its latest generation of AI models, GPT‑5.6, marking a major transition point both for its product roadmap and its organizational structure.

In a note sent to staff on Thursday, Simo explained that her ongoing medical leave has proven longer and more challenging than initially anticipated. As a result, she will transition from her full‑time role to a part‑time advisory position moving forward.

Background and Role at OpenAI

Simo joined OpenAI’s board of directors in 2024, before taking on the newly created role of CEO of Applications in May 2025. Reporting directly to CEO Sam Altman, her appointment consolidated the company’s business, product, and commercial operations under a single leader. The restructuring shifted key executives, including Chief Operating Officer Brad Lightcap, Chief Financial Officer Sarah Friar, and Chief People Officer Kevin Weil, to report to her, while Altman stepped back to focus more narrowly on long‑term research, computing infrastructure, and AI safety.

Her departure follows a period of health‑related absence. In April 2026, Simo first disclosed that she was taking medical leave to manage a relapse of a neuroimmune condition. That same month, the company announced a series of internal changes: Lightcap moved into a new “special projects” role, Chief Marketing Officer Kate Rouch left to focus on her own cancer recovery, and Kevin Weil later departed the company as well.

Simo brought extensive leadership experience to OpenAI. Before joining, she served as CEO of Instacart from 2021, guiding the company through its successful initial public offering in 2023. Before that, she spent more than a decade at Meta, where she rose to oversee the core Facebook app, giving her deep expertise in scaling consumer products and global platforms.

A Leadership Vacuum Ahead of Key Milestones

Her decision to step back creates a notable gap in OpenAI’s leadership structure, particularly as the company reportedly prepares for a potential public listing. Since her arrival, Simo had been widely viewed as a strong candidate to take on even greater responsibilities once OpenAI went public, bringing operational and public‑market experience that Altman himself did not have.

During her tenure, Simo’s primary focus was expanding OpenAI’s consumer business. However, growth in the flagship ChatGPT platform slowed in late 2025, falling short of internal revenue targets. This slowdown prompted the company to shift more resources toward enterprise and developer tools, a segment where it has faced intense competition, notably from rival Anthropic, which has gained ground in coding and business applications.

Soon after the news broke, Simo confirmed the update directly on X (formerly Twitter). Sam Altman followed with a public response, writing:

“I am really sad about this and very grateful for all Fidji has done for OpenAI, and even grateful for her friendship and who she is as a person. We all wish her the best for a speedy recovery. This sucks.”

Executive Bench and Potential Succession

With a valuation recently pegged at $852 billion, OpenAI is one of the most highly valued private companies in the world, yet its executive leadership team appears relatively lean. Alongside Altman, the current core leadership includes CFO Sarah Friar, former COO Brad Lightcap, and co‑founder Greg Brockman, who serves as president and has overseen product strategy during Simo’s absence.

One name frequently mentioned as a potential candidate to expand her role is Denise Dresser, who joined OpenAI in December 2025 as Chief Revenue Officer, tasked with overseeing global enterprise sales and customer success. Dresser previously served as CEO of Slack and spent 14 years in leadership roles at Salesforce, giving her a strong track record in scaling business operations, a profile that aligns closely with the responsibilities Simo held.

Broader Context: Talent and Compensation

Simo’s exit also comes against a backdrop of aggressive competition for AI talent and evolving employee policies at OpenAI. In April 2025, the same month Simo formally joined the company, OpenAI began revising its equity terms to attract and retain top engineers and executives. It reduced the standard vesting cliff from 12 months to six months, and by December 2025, it eliminated the waiting period, allowing new hires’ stock grants to begin vesting from day one.

At the time, Simo described the change as a way to let employees “take risks” without fear of losing their equity if their role changed or they left the company. The shift also reflected the high cost of talent in the AI race; OpenAI projected it would spend roughly $6 billion on stock‑based compensation alone in 2025.

OpenAI has emphasized that none of the recent executive departures are linked to compensation issues, noting that leadership packages are negotiated individually and often follow different terms from those of regular employees.

As the company moves forward with its new GPT‑5.6 models and enterprise tools, the departure of its chief operating leader marks a critical moment. Altman will need to quickly fill the gap to ensure the company maintains momentum in both product development and commercial growth, while navigating an increasingly competitive market and its eventual transition to being a publicly traded firm.