GPT-5.6 replaced GPT-4o in 365 Copilot — is the performance boost worth the cost
microsoft made gpt-5.6 the default model for 365 copilot, replacing the previous standard in word, excel, and powerpoint. this upgrade forces enterprises to reassess their ai roi.
openai has implemented gpt-5.6 as the default model for microsoft 365 copilot, effectively retiring the prior standard across the office suite including the new 'cowork' feature. the update targets enterprise productivity by enhancing the speed and quality of ai-generated content in documents and spreadsheets. this change impacts millions of corporate users, establishing gpt-5.6 as the new benchmark for business-grade ai assistants. it suggests that the newer model has reached the stability and efficiency required for broad deployment in sensitive enterprise environments.