Microsoft and xAI have made Grok 4.1 Fast model available inside Microsoft Copilot Studio. The move brings another high-speed reasoning option to the platform that businesses use to build AI agents. Microsoft announced the addition on February 19, 2026; however, the rollout begins now as a preview.
Grok 4.1 Fast is a text-generation model tuned for fast reasoning and long context. It is meant for complex, text-heavy workflows and deep tool use. Microsoft says it has added this model, so makers can choose the best engine for each task.
Adding Grok 4.1 Fast gives enterprises more model choice on Copilot Studio. While building agentic workflows, businesses can choose a model that handles long documents, integrates many tools, or reasons quickly under time pressure. Microsoft positions the addition as part of its multi-model strategy that already includes other providers, including OpenAI and Anthropic.
How to Use Grok 4.1 Fast in Microsoft Copilot Studio?
To use Grok 4.1 Fast in Microsoft Copilot Studio, administrators must opt in before developers can use the model. Admins who want to test Grok 4.1 Fast should review xAI’s terms and opt in within Copilot Studio to get started.
Microsoft keeps its principle of building responsible AI in focus as it adds xAI’s Grok 4.1 to Copilot Studio. It indicates that every model in Copilot Studio undergoes Microsoft’s security, safety, and quality assessment checks.
Microsoft says customer data processed through Grok 4.1 Fast will not be used to train xAI models. The model runs outside Microsoft-managed infrastructure, and usage is governed by xAI’s enterprise terms and data protection policies. This indicates that organizations will have a separate agreement with xAI when they enable the model.
Availability of Grok 4.1 Fast in Microsoft Copilot Studio
Microsoft and xAI make Grok 4.1 Fast available in Copilot Studio’s early access preview for United States-based organizations. The feature is disabled by default and must be enabled by an administrator in each organization.
Microsoft and xAI’s collaboration is a clear win for customers who want options while building AI agents. Copilot Studio now supports another specialized model for fast, context-rich text tasks.
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