OpenAI’s leadership ranks have thinned dramatically in recent weeks. Denise Dresser, hired in December as chief revenue officer, announced her departure on Thursday, just two days after Brad Lightcap said he was ending an eight-year run at the ChatGPT creator to “start something new.” The exits come as the company, which confidentially filed its IPO prospectus in June, works to justify an $852 billion valuation and prepare for what could be a historic initial public offering.
At the time of her hiring, Fidji Simo, a top executive, wrote in a blog post that Dresser’s “experience will help us make AI useful, reliable, and accessible for businesses everywhere.” Four months later, Dresser took on added responsibilities when Lightcap stepped away from the chief operating officer role to focus on “special projects.” Now Simo has also departed, leaving the company’s C suite in turmoil.
Simo, who left the CEO post at Instacart last year to join OpenAI, revealed in July that she was taking time away to recover from a “severe exacerbation of a chronic illness.” Dresser and Lightcap are thus part of a broader wave of high profile exits.
The departures land at a delicate time for OpenAI, with investors already focused on competitive pressure from Google and Anthropic, the growing appeal of cheaper open weight models, and the recent volatility in SpaceX’s stock price during its first two months of trading.
The sudden news of Dresser’s exit unsettled some in the investment community. Kevin McCormick, founder of AI startup SignAudit.AI, posted on X Thursday: “The executives leaving OpenAI ahead of their IPO is a huge red flag.” He added that Dresser likely walked away from a large pay package by leaving after less than one year. “If the executives leaving aren’t being ‘made whole’ by the next company, it’s bad news for OpenAI,” he wrote.
OpenAI pointed CNBC to a statement from Brockman, made after the company appointed Dali Rajic as its new chief revenue officer. Rajic previously served as COO of cybersecurity firm Wiz, which Google acquired for $32 billion earlier this year. Brockman said Dresser steered the revenue group through a “formative period for the business,” and predicted Rajic “will turn what we’ve learned into repeatable execution as we build out the full system to make AI broadly useful for people and businesses.”
Two current OpenAI investors, speaking on condition of anonymity, said Dresser’s announcement took them by surprise. They attributed the upheaval to OpenAI’s fast moving culture, which has long embraced rapid change.
Dresser spent more than a decade in senior roles at Salesforce before joining OpenAI in December. She was responsible for growing the enterprise unit, a high margin business that faces competition from Anthropic. Under her leadership, OpenAI said the enterprise segment reached 2 million customers, double the number from a year earlier.
In a Slack message to employees on Thursday, Brockman reported that run rate revenue increased more than 20% month over month in July, including 32% growth from business customers. “We’re now at an inflection point: the next generation of models will change not just how individual workflows get done, but what it means to build and run a company,” he wrote. “Our opportunity is to bring those capabilities to businesses across the economy.”
On Friday, CFO Sarah Friar held a previously scheduled meeting with investors, according to a person who attended. Brockman joined her to update shareholders. Friar said enterprise now brings in more revenue than the consumer ChatGPT business. Brockman thanked Dresser for building the enterprise foundation, and also dismissed concerns about open source models emerging from China.
In an April interview with CNBC, Dresser said, “I just have never seen this level of conviction spread so quickly and consistently within the industries.” At that time, enterprise represented 40% of company revenue and was “on track to reach parity with consumer by the end of 2026.” Days before that interview, she had taken over many of Lightcap’s responsibilities, boosting her profile within the company.
Rajic was introduced to OpenAI through Thrive founder Josh Kushner, according to a person with knowledge of the recruitment process. Thrive has been one of OpenAI’s most prominent investors.
Two former employees, who also requested anonymity, described OpenAI as having a hire fast, fire fast culture, and one compared the environment to a pressure cooker.
Leadership instability has been a recurring theme for OpenAI. In 2023, Altman was briefly pushed out as CEO after the board said he was “not consistently candid in his communications.” He returned days later amid investor panic and employee threats to resign. Some staff members still refer to that moment as “the blip.”
The episode surfaced again during the May trial over a lawsuit filed by Elon Musk. Musk’s lawyers used Altman’s ouster to question his credibility, and Altman told the court in Oakland, California: “I was not trying to deceive the board.” Attorneys also pressed him about executives who raised concerns, including Anthropic CEO Dario Amodei. Altman said Amodei had accused him of “many things.” Brockman, for his part, was asked about a memo from co-founder Ilya Sutskever that was critical of his performance and management. When a lawyer suggested his management style had been heavily criticized by employees, Brockman replied, “I certainly disagree with that characterization.” An advisory jury later concluded that Musk had waited too long to bring his case, and Musk said he would appeal.
This week’s exits have only intensified the spotlight. After Lightcap announced his departure, Altman thanked him on X and said he was “excited to work together on what’s next.” There was no comparable post for Dresser. Instead, Altman spent Thursday on X responding to a product announcement, writing “/ultrafast” in answer to a post about a preview of “Ultrafast mode,” a new GPT-5.6 model promoted as running “at up to 14x the speed.”
OpenAI has not set a timeline for its IPO, and this week’s departures have left investors weighing how the leadership changes could affect the company’s trajectory. The appointment of Rajic gives the revenue team a new leader, but the string of exits continues to raise questions about stability at the top.
