GPT-5 in Microsoft 365 Copilot - What's changed?

With the arrival of GPT-5, for the first time Microsoft 365 Copilot is stated to be running on OpenAI's flagship frontier model. And with its arrival too across Microsoft Copilot, Copilot Studio, and Azure AI Foundry, Microsoft is all in on GPT-5. So, what does this release mean for you?