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Shocker: Sam Altman Steps Down as OpenAI's CEO

The company's board is indicating Altman withheld information. OpenAI CTO Mira Murati has been tapped to replace him as interim CEO.

 & Michael Kan Principal Reporter

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UPDATE 11/20: It was an eventful weekend for Altman, OpenAI, and Microsoft. News broke over the weekend that OpenAI's board was talking to Altman (and Brockman) about returning to the company. Altman even tweeted a photo of himself wearing an OpenAI visitor's badge on Sunday afternoon. By early Monday morning, however, Microsoft CEO Satya Nadella tweeted that Redmond had instead hired Altman and Brockman to head up a new AI institute.

The news isn't sitting well with OpenAI employees. More than 500 of them published an open letter this morning demanding that Altman return as CEO and the resignation of the board or they'll defect to Microsoft, too.


UPDATE: Sam Altman has published a tweet about his departure. He didn't elaborate on why he was forced to step down, but he signaled he already has a new project in the works.

"Will have more to say about what’s next later," he wrote.

OpenAI's President and co-founder Greg Brockman has also quit the company following Altman's departure. OpenAI says Brockman has stepped down as chairman of the board.

Original story:

In a surprising move, OpenAI has fired CEO Sam Altman, apparently for withholding information. 

The company this afternoon announced that Altman has stepped down as chief executive, despite his massive success in leading OpenAI to develop ChatGPT, the AI program that has taken the world by storm in the last year.

“Mr. Altman’s departure follows a deliberative review process by the board, which concluded that he was not consistently candid in his communications with the board, hindering its ability to exercise its responsibilities,” the company said. “The board no longer has confidence in his ability to continue leading OpenAI.”

The San Francisco-based company has yet to elaborate. But the loss of Altman — a company co-founder— may be a huge blow for OpenAI since he was also the face of the company at a time when governments are looking at regulating generative AI. This month, Altman led OpenAI’s first developer conference, and he was in attendance at the Asia-Pacific Economic Cooperation in San Francisco this week. 

OpenAI CTO Mira Murati will act as interim CEO, effective immediately, while a search process for a permanent chief executive begins. “A member of OpenAI’s leadership team for five years, Mira has played a critical role in OpenAI’s evolution into a global AI leader,” the company said.

OpenAI adds that Altman is also leaving the company’s six-member board. “OpenAI was deliberately structured to advance our mission: to ensure that artificial general intelligence benefits all humanity. The board remains fully committed to serving this mission. We are grateful for Sam’s many contributions to the founding and growth of OpenAI. At the same time, we believe new leadership is necessary as we move forward.”

Part of that growth includes billion-dollar investments from Microsoft. On Twitter this afternoon, Microsoft, CEO Satya Nadella wrote: “We have a long-term agreement with OpenAI with full access to everything we need to deliver on our innovation agenda and an exciting product roadmap; and remain committed to our partnership, and to Mira and the team. Together, we will continue to deliver the meaningful benefits of this technology to the world.”

About Our Expert

Michael Kan

Michael Kan

Principal Reporter

My Experience

I've been a journalist for over 15 years. I got my start as a schools and cities reporter in Kansas City and joined PCMag in 2017, where I cover satellite internet services, cybersecurity, PC hardware, and more. I'm currently based in San Francisco, but previously spent over five years in China, covering the country's technology sector.

Since 2020, I've covered the launch and explosive growth of SpaceX's Starlink satellite internet service, writing 600+ stories on availability and feature launches, but also the regulatory battles over the expansion of satellite constellations, fights with rival providers like AST SpaceMobile and Amazon, and the effort to expand into satellite-based mobile service. I've combed through FCC filings for the latest news and driven to remote corners of California to test Starlink's cellular service.

I also cover cyber threats, from ransomware gangs to the emergence of AI-based malware. In 2024 and 2025, the FTC forced Avast to pay consumers $16.5 million for secretly harvesting and selling their personal information to third-party clients, as revealed in my joint investigation with Motherboard.

I also cover the PC graphics card market. Pandemic-era shortages led me to camp out in front of a Best Buy to get an RTX 3000. I'm now following how the AI-driven memory shortage is impacting the entire consumer electronics market. I'm always eager to learn more, so please jump in the comments with feedback and send me tips.

The Best Tech I've Had:

  • My first video game console: a Nintendo Famicom
  • I loved my Sega Saturn despite PlayStation's popularity.
  • The iPod Video I received as a gift in college
  • Xbox 360 FTW
  • The Galaxy Nexus was the first smartphone I was proud to own.
  • The PC desktop I built in 2013, which still works to this day.

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