OpenAI's GPT 5.6: Key Engine of Microsoft Copilot 365

Relations between OpenAI and Microsoft have recently been the subject of much speculation, particularly following a Bloomberg report indicating that Microsoft was looking to replace some OpenAI software with its own internal models, named MAI, in applications such as Word and Excel. This initiative aimed to reduce costs, casting doubt on the sustainability of their partnership.

However, OpenAI has taken the lead to dispel these rumors by announcing that its GPT 5.6 model is now the "preferred model" to power Microsoft Copilot 365. This statement was made during the launch of GPT 5.6, highlighting the ongoing commitment of both companies to collaborate.

In a blog post, OpenAI clarified that GPT 5.6 would support Microsoft users across a suite of productivity applications, including Word, Excel, PowerPoint, and Cowork. This announcement aims to reassure stakeholders about the strength of their partnership, despite the mixed signals sent recently.

Although the term "preferred model" is not fully explained, it confirms that OpenAI's software will continue to play a central role in Microsoft applications. Previous reports never suggested that ChatGPT would stop powering these applications, but rather that Microsoft was increasing the use of its own software for economic reasons. Thus, the emphasis on GPT 5.6 does not contradict this information but reaffirms the importance of this model in their collaboration.