OpenAI has reached a new tentative agreement with Microsoft and said its nonprofit, which technically controls its business, will now be given a $100 billion equity stake in its for-profit corporation. The maker of ChatGPT said it had reached a new nonbinding agreement with Microsoft, its initial and still largest backer, “for the next phase of our partnership.” OpenAI's proposed changes to its corporate structure have drawn the scrutiny of regulators, competitors and advocates concerned about the impacts of artificial intelligence.