In a statement on Friday, OpenAI said the move followed a “deliberative review process by the board” which concluded Mr Altman “was not consistently candid in his communications with the board”.
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Mr Brockman then detailed a timeline of what occurred in the lead up to his former colleague being sacked.
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He said Mr Altman received a message the night before from co-founder Ilya Sutskever, saying they should meet at midday the following day.
Mr Brockman then said the chief executive was told he would be fired during that virtual meeting with board members. He was then told around 20 minutes later that he would be removed from the board – but retain his role at the company.
Mr Altman and Mr Brockman helped start OpenAI as a non-profit research laboratory in 2015.
In the past year, they were thrust into the global spotlight as the faces of OpenAI after ChatGPT exploded into public consciousness.