Fidji Simo steps down from leading OpenAI's AGI work due to illness

On July 9, 2026, Fidji Simo announced on X that she would step down from her full-time role as CEO of OpenAI's AGI Deployment to become a part-time advisor. This decision stems from her medical leave that began in April 2026—when she took several weeks off due to a severe relapse of a neuroimmune condition, but her recovery has proven far longer and more complex than anticipated. In her statement, Simo wrote: "Three months ago, I took medical leave due to a severe relapse of a chronic condition I've lived with for seven years. During this time, I've come to realize that the road to recovery will be much longer and more complicated than I expected—I need to dedicate myself fully to it." She added that trying to help build the future while dealing with a disabling disease that has no cure is a shocking experience.

Simo's departure is not an isolated event. In April 2026, while announcing her medical leave, she also disclosed that COO Brad Lightcap was moving to a "special projects" role and CMO Kate Rouch was leaving due to cancer recovery. Subsequently, CPO Kevin Weil also left the company. This series of executive changes has left OpenAI's leadership team relatively thin, especially for a company valued at $852 billion and considering an IPO.

Fidji Simo joined OpenAI's board in 2024 and officially joined the company in May 2025 as CEO of Applications, a newly created role reporting directly to Sam Altman, consolidating the company's business and product operations. Her arrival brought significant changes in reporting lines: COO Brad Lightcap, CFO Sarah Friar, and CPO Kevin Weil began reporting to her, while Altman stepped back to focus on research, compute, and safety. Simo quickly became OpenAI's de facto second-in-command and was widely seen as a candidate to take on more responsibilities after the company's IPO.

However, during her medical leave, the power structure shifted again. In mid-May 2026, the company underwent a reorganization: co-founder and president Greg Brockman formally took over product strategy and "scaling" efforts, leading four pillar divisions: core product and platform, key enterprise industries, consumer business (health, commerce, personal finance), and core infrastructure, advertising, data science, and growth. In an internal memo, Brockman wrote that the reorganization would help the company prioritize AI agent goals by consolidating products to "invest in a single agent platform and merge ChatGPT and Codex into a unified agent experience."

On the day Simo announced her departure, OpenAI released the new GPT-5.6 family of models—Sol, Terra, and Luna—along with a new agent called ChatGPT Work, designed to handle multi-step office tasks such as drafting documents, spreadsheets, and presentations. Both releases were positioned by OpenAI as direct competitors to Anthropic. Notably, Simo had been primarily responsible for consumer business growth, but ChatGPT's growth slowed in late 2025, missing internal revenue targets, forcing the company to rely more on coding tools—an area where OpenAI has lagged behind Anthropic.

Simo's departure also adds uncertainty to OpenAI's IPO prospects. She was seen as a key figure to lead the company into the public market after the IPO. Now, Altman needs to find a successor. TechCrunch analysis suggests that Chief Revenue Officer Denise Dresser could take on a broader role—she previously served as CEO of Slack for two years and worked at Salesforce for 14 years. Additionally, OpenAI has invested heavily in talent retention: in April 2025, it shortened the equity cliff from the industry-standard 12 months to 6 months, and in December 2025, it completely eliminated the cliff, allowing new employees to start vesting from day one. The company expects stock-based compensation expenses to reach $6 billion in 2025 alone.

Simo's departure leaves a key question: who will succeed her in leading AGI deployment and applications? Currently, besides Altman, OpenAI's executive team includes COO Brad Lightcap (but now in special projects), CFO Sarah Friar, President Greg Brockman (who has taken over product strategy), and CRO Denise Dresser. Brockman has effectively taken over product during Simo's leave, but the long-term leader for the core AGI deployment function remains undecided.

Another uncertainty is OpenAI's IPO timeline. Simo's departure could delay or alter IPO plans, as investors typically expect a stable management team. Additionally, it remains to be seen whether OpenAI's efforts to catch up with Anthropic in coding tools will be hindered by the executive changes. Although the GPT-5.6 release demonstrates technical progress, the leadership vacuum at the commercial execution level could impact short-term performance.