OpenAI Unveils GPT 5.6 for Microsoft 365
On July 10, 2026, OpenAI announced that its new GPT 5.6 model will serve as the engine behind Microsoft 365 Copilot, supporting users across Word, Excel, PowerPoint, and Cowork. The disclosure, first reported by TechCrunch at 9:30 PM Kyiv time, comes during swirling speculation that the partnership between OpenAI and Microsoft may be cooling.
GPT 5.6 officially launched on Thursday, July 10, 2026. According to a prior Bloomberg report, Microsoft has been shifting certain workloads from OpenAI’s software to its own in-house MAI models, which have already been powering Word and Excel.
The Stakes of the OpenAI-Microsoft Alliance
OpenAI stressed the significance of its collaboration with Microsoft, stating:
‘Our partnership with Microsoft has always been about bringing the benefits of cutting-edge AI to more people and organizations, and we are excited to continue advancing this shared commitment.’ — OpenAI
This announcement unlocks fresh possibilities for Microsoft 365 users, highlighting a drive to weave modern technology into everyday workflows.
The news underscores the enduring strategic alliance between OpenAI and Microsoft—one that could shape the trajectory of AI in the business world. Integrating GPT 5.6 into widely used office applications promises to boost user productivity by introducing new features and automation tools for routine tasks. Still, it remains an open question how Microsoft’s evolving strategy around its own MAI models will affect future cooperation with OpenAI.
As the partnership dynamics shift, it's essential to consider the implications of Microsoft's strategy. Recent reports indicate that Microsoft may be moving away from OpenAI for Excel and Outlook due to rising costs, raising questions about the future of AI integration in their suite of applications.