OpenAI confirmed on Thursday that GPT 5.6 is the preferred model powering Microsoft Copilot, directly addressing recent reports suggesting the two firms are drifting apart. Bloomberg had earlier claimed Microsoft was replacing OpenAI software with its own in-house MAI models to cut costs, specifically within Word and Excel. During the launch event for the new GPT 5.6 update, the company stated it would continue supporting Microsoft users across the full suite of productivity apps, including PowerPoint and Cowork. This announcement aims to quell speculation about a breakup between the partners who once seemed inseparable.
The distinction of being a preferred model does not necessarily mean Microsoft will stop using its own internal AI. The new disclosure clarifies that OpenAI’s software will continue to power Microsoft’s applications, rather than negating previous reports about increased reliance on MAI. The arrangement simply reinforces the existing partnership while allowing Microsoft flexibility to mix its own models where appropriate. The core business relationship appears intact despite the recent chatter about cost-cutting measures.
- GPT 5.6 powers Word, Excel, PowerPoint, and Cowork
- Microsoft continues to develop its own MAI models
- OpenAI explicitly denied any breakup between the companies
