Top investors and senior OpenAI leaders were still pushing to reinstate Sam Altman to his CEO role at OpenAI as the future of the artificial-intelligence company remained in jeopardy.

The talks continued as much of OpenAI’s staff threatened Monday to quit if the board didn’t restore Altman to power, according to people familiar with the matter. Meanwhile, OpenAI’s rivals were making public overtures to any disgruntled employees at the startup company behind the viral chatbot ChatGPT.