Microsoft Adds xAI’s Grok 4.1 Fast to Copilot Studio, Expands AI Model Choices

• Microsoft Copilot Studio now includes xAI’s Grok 4.1 Fast in preview, offering a fast-reasoning, text-generation system for large contexts and complex workflows.
• Grok 4.1 Fast is currently limited to US-based makers in early access environments and must be explicitly enabled by administrators.
• This addition reflects Microsoft's multi-model strategy, providing organizations with more AI engine choices alongside OpenAI and Anthropic models.
• Customer data used with Grok 4.1 Fast in Copilot Studio is not retained or used for training xAI’s models, but models are hosted outside Microsoft environments.
• Microsoft emphasizes orchestration, giving enterprises access to multiple AI engines while maintaining administrative control and undergoing security evaluations.