Microsoft OpenAI refers to the partnership and collaboration between Microsoft and OpenAI, an artificial intelligence organization. This partnership involves Microsoft investing $13 billion in OpenAI, providing access to its cloud platform, and holding a 49% stake in OpenAI Global, LLC's profits. The collaboration enables the development and deployment of advanced AI models, such as those based on OpenAI's GPT-4 and GPT-3, on Microsoft's Azure platform[1][3].