OpenAI (OPAI.PVT) was once the apple of Microsoft's (MSFT) eye, the Big Tech giant currently holding a 27% stake in the private AI developer's for-profit business. But things may have begun to sour between the two, evident of Microsoft revealing its latest MAI-Thinking-1 AI model on Tuesday. The Verge senior AI reporter Hayden Field highlights the timeline of lessening exclusivity that has landed these two tech developers in a "situationship."