OpenAI’s GPT-5 has arrived—and Microsoft is switching it on across Copilot, Microsoft 365, GitHub, and Azure the same day, ushering in a sweeping upgrade for Windows users at work and home. On August 7, 2025, OpenAI unveiled its most advanced model yet, and Microsoft confirmed immediate integration, including a new Copilot “Smart mode” that automatically picks the right model for each task so you don’t have to. For Windows enthusiasts, this means more accurate answers, deeper reasoning...