Fidji Simo Steps Down as OpenAI’s No. 2 Executive

What happened

Fidji Simo, the high-profile executive who joined OpenAI to lead its consumer applications and business operations, is officially stepping down from her full-time role. After a period of medical leave that began in April, Simo informed staff that her recovery from a neuroimmune condition relapse has been more difficult and time-consuming than anticipated. Rather than returning to her previous post as CEO of Applications, she will move into a part-time advisory capacity to assist the company during this transition. This move marks a significant shift for OpenAI, as Simo was responsible for consolidating the company’s product and business arms under a single reporting structure. Her role saw major executives like COO Brad Lightcap and CFO Sarah Friar reporting directly to her, which allowed CEO Sam Altman to focus his attention on the technical pillars of research, compute, and safety.

What's new in this update

The disclosure of Simo's permanent step-back coincided with a major product announcement from OpenAI, highlighting the contrast between corporate leadership changes and technical momentum. While the company launched its GPT-5.6 model family—which includes the specialized Sol, Terra, and Luna models—and a new enterprise agent called ChatGPT Work, it is now simultaneously grappling with a thinned executive bench. Simo’s departure follows the recent exit of Chief Product Officer Kevin Weil and CMO Kate Rouch. Sam Altman expressed personal regret over the news on social media, acknowledging the difficulty of the situation while praising Simo’s contributions to the company's growth. The timing is particularly sensitive as OpenAI is currently assigned an $852 billion valuation and is widely rumored to be preparing for an initial public offering, a process Simo was expected to shepherd.

Key details

Simo arrived at OpenAI in May 2025 following a successful tenure as the CEO of Instacart, where she led the grocery delivery giant through its 2023 IPO. Her background also included over a decade at Meta, where she managed the core Facebook app and established herself as a leader in consumer product growth. At OpenAI, she was tasked with scaling the consumer business, though internal reports suggest that ChatGPT’s growth had cooled by late last year, leading to missed revenue targets. This trend pushed the company to lean more heavily into coding tools and enterprise solutions to compete with rivals like Anthropic. During Simo's medical leave, OpenAI president Greg Brockman oversaw product strategy, and the company recently hired Denise Dresser as Chief Revenue Officer. Dresser, formerly the CEO of Slack, is now viewed as a logical internal candidate to absorb some of Simo’s previous responsibilities.

Background and context

The leadership restructuring at OpenAI reflects a broader period of transition for the artificial intelligence powerhouse as it seeks to professionalize its corporate governance. When Simo was hired, the company notably adjusted its internal equity policies to attract and retain top-tier talent from the broader tech industry. OpenAI shortened its stock vesting cliff from the standard 12 months to just six months, and later eliminated it entirely for new hires in December. Simo herself had championed these changes, arguing internally that they allowed employees to take necessary professional risks without the fear of losing equity if their tenure ended prematurely. This policy shift occurred alongside a massive expansion of the company’s valuation and a reorganization that moved day-to-day business management away from Altman, who sought to prioritize the long-term development of artificial general intelligence and safety protocols.

What to watch next

All eyes are now on Sam Altman as he seeks a permanent successor for the No. 2 role in the company. The vacancy comes at a critical juncture; OpenAI is locked in a fierce competitive battle with Anthropic, particularly in the realm of AI agents and automated office tools. The recent launch of GPT-5.6 and ChatGPT Work signals a commitment to capturing the enterprise market, but the lack of a dedicated lead for Applications could potentially slow down the implementation of these high-stakes products. Investors and stakeholders will likely look for signs of stability within the executive suite to maintain the company’s trajectory toward a public offering. Whether Denise Dresser takes on a more expansive role or OpenAI seeks another high-profile external hire from the tech sector will provide the next clear signal regarding the company's long-term commercial strategy and stability.