Enlarge (credit: OpenAI / Benj Edwards)

On Wednesday, OpenAI announced that Sam Altman has officially returned to the ChatGPT-maker as CEO—accompanied by Mira Murati as CTO and Greg Brockman as president—resuming their roles from before the shocking firing of Altman that threw the company into turmoil two weeks ago. Altman says the company did not lose a single employee or customer throughout the crisis.

"I have never been more excited about the future. I am extremely grateful for everyone’s hard work in an unclear and unprecedented situation, and I believe our resilience and spirit set us apart in the industry," wrote Altman in an official OpenAI news release. "I feel so, so good about our probability of success for achieving our mission."

In the statement, Altman formalized plans that have been underway since last week: ex-Salesforce co-CEO Bret Taylor and economist Larry Summers have officially begun their tenure on the "new initial" OpenAI board of directors. Quora CEO Adam D’Angelo is keeping his previous seat on the board. Also on Wednesday, previous board members Tasha McCauley and Helen Toner officially resigned. In addition, a representative from Microsoft (a key OpenAI investor) will have a non-voting observer role on the board of directors.

Enlarge (credit: Benj Edwards)

After two days of roller-coaster negotiations at OpenAI HQ due to the surprise ouster of CEO Sam Altman, Microsoft CEO Satya Nadella has announced that Microsoft plans to hire Altman and former OpenAI President Greg Brockman to head a "new advanced AI research team." Overnight, the OpenAI board named a new interim CEO, Emmett Shear, who acknowledged the messy process and promised to hire an investigator to generate a full report on Altman's firing.

But the story isn't over yet, because Monday morning, 650 of 770 OpenAI employees sent a letter to the OpenAI board demanding that all current board members resign and Altman and Brockman be reinstated, or they will likely leave to join Altman and Brockman at Microsoft. (Apparently the number of signatories to the letter is still growing; see update below.)

"The process through which you terminated Sam Altman and removed Greg Brockman from the board has jeopardized all of this work and undermined our mission and company," the letter states. "Your conduct has made it clear you did not have the competence to oversee OpenAI."