OpenAI said Thursday that Chief Revenue Officer Denise Dresser is leaving her role less than a year after she joined the artificial intelligence lab, a startling exit for a company that's gearing up for what's expected to be a blockbuster IPO.

The company said Dresser is leaving "to pursue other opportunities," according to a release. OpenAI has hired Dali Rajic, who previously served as the president and chief operating officer of the cybersecurity company Wiz, to replace her.

"The opportunity to work hands-on with the most transformative technology in the world has been nothing short of incredible," Dresser wrote in a post on LinkedIn on Thursday. "I am so proud of what we have accomplished and, even more, of how this team has shown up for our customers and one another."

Dresser's departure marks the second senior exit at OpenAI in days. Longtime OpenAI executive Brad Lightcap announced his decision to leave the company on Tuesday, writing in a post on X that he is going to "start something new."

Lightcap had been at OpenAI for eight years and was a longtime friend and colleague of the company's CEO, Sam Altman. Dresser, by contrast, was hired in December after she spent more than a decade as an executive at Salesforce . Her exit poses a particular conundrum for OpenAI, in large part because she brought the company enterprise expertise that it sorely needed to take on its chief rival, Anthropic .

Dresser was also tapped to take over many of Lightcap's responsibilities in April, when OpenAI said Lightcap was transitioning to a new role focused on "special projects."