[COX] Sam Altman Faces Another Leadership Test as OpenAI's Number Two …

Fidji Simo, widely regarded as OpenAI's second-in-command, has stepped down completely. CEO Sam Altman's leadership is once again set to face scrutiny. / Image generated by COXNEWS using Gemini (AI)

Fidji Simo, Chief Executive Officer (CEO) of OpenAI's Applications division and widely regarded as the company's de facto second-in-command, announced her complete resignation on 9 July (local time). Simo, who has been on medical leave since April 2026 following a recurrence of a chronic illness, said in an internal announcement that her recovery was proving longer and more complicated than expected, and that she would transition to a part-time advisory role. The reason is a severe worsening of Postural Orthostatic Tachycardia Syndrome (POTS), which she was diagnosed with in 2019.

Simo joined OpenAI from Instacart in May 2025 to lead the newly established Applications division as CEO. At the time, the company was reorganised so that Chief Operating Officer (COO) Brad Lightcap, Chief Financial Officer (CFO) Sarah Friar, and Chief Product Officer (CPO) Kevin Weil all reported directly to her, while Chief Executive Officer Sam Altman stepped back to focus on research, computing and safety. She was effectively responsible for overseeing the company's entire business and product organisation. Since Simo began her medical leave in April 2026, President Greg Brockman has overseen the product division on an interim basis. Altman previously experienced an unprecedented leadership crisis in November 2023, when he was abruptly dismissed by OpenAI's board before returning just five days later. With the departure of his second-in-command, he now faces a second major test of his leadership.

The timing is also unfortunate. It is important to make clear that Simo's departure is the result of health issues rather than poor business performance. The two developments merely coincide in timing and should not be interpreted as having a causal relationship. Nevertheless, the overlap in timing is itself a burden for OpenAI. According to TechCrunch, growth in consumer-facing ChatGPT began slowing noticeably from late 2025 and fell short of the company's internal revenue targets. OpenAI's increasing focus on coding tools appears to reflect the same backdrop, although TechCrunch noted that the company still trails Anthropic in that segment. With Simo, who primarily oversaw the consumer business, stepping away completely, OpenAI is now left with a leadership gap in an area widely regarded as one of its vulnerabilities.

The development also coincides with growing speculation that OpenAI is considering an initial public offering (IPO). Within the industry, Simo had been widely viewed as a leading candidate to take on an even greater role after the company eventually went public. With her complete departure, Altman must now find a successor. Having the company's top business leadership position left vacant while preparing for a public listing is enough to raise questions among investors about organisational stability.

Even so, OpenAI's response has been swift and measured. Simo's responsibilities have already been distributed among existing executives including Lightcap, Friar and Weil, limiting any immediate operational disruption. Altman also publicly thanked Simo in a post on X, demonstrating an effort to manage the relationship carefully. Given that her departure is health-related, competitors such as Anthropic have little justification for exploiting the situation aggressively. The real challenge lies not in the present moment, but in the longer-term tasks of appointing a successor and reviving the consumer business.

Ultimately, attention will focus on two issues. The first is whether OpenAI can resolve the structural slowdown in its consumer business under new leadership. The second is how quickly it can fill the leadership vacuum ahead of a potential public listing. Whether the absence of its second-in-command proves to be nothing more than a temporary personnel issue, or instead becomes a factor that delays OpenAI's business restructuring, is likely to be determined by the speed of the succession process.