copilot model routing

The copilot model routing tag covers Microsoft’s shift toward using its own MAI models for some Microsoft 365 Copilot prompts. Current coverage focuses on Excel and Outlook, where tens of thousands of weekly prompts have reportedly begun routing through MAI systems instead of relying solely on OpenAI and Anthropic models. The change represents a production-scale backend adjustment rather than a complete Copilot re-platforming or a break with OpenAI. These reports frame frontier AI models as replaceable infrastructure within Microsoft’s services, making model selection and traffic routing important parts of how Copilot features are operated and evolved.