OpenAI says GPT 5.6 is the ‘preferred model’ for Microsoft Copilot 365 amid breakup chatter

Amid ongoing speculation about a potential rift between OpenAI and Microsoft, TechCrunch AI reports that OpenAI's latest model, GPT 5.6, has been designated as the 'preferred model' for Microsoft Copilot 365. This move reinforces their partnership, at least for now, and signals that Microsoft's productivity suite will continue to leverage OpenAI's cutting-edge language models. For developers and solopreneurs building AI workflows around Microsoft's ecosystem, this means that Copilot's capabilities are now powered by a more advanced model, potentially offering improved reasoning and accuracy in tasks like document drafting, data analysis, and code generation. The designation also suggests that Microsoft is betting heavily on OpenAI's trajectory, even as rumors swirl about Microsoft developing its own models or diversifying its AI partners. Practically, builders should monitor how this model update affects Copilot's performance and consider testing any custom workflows that integrate with Copilot to ensure compatibility and optimal results. The underlying technology shift could also influence decisions for those building on top of OpenAI's APIs, as Microsoft's endorsement may accelerate adoption of GPT 5.6 across enterprise tools.