Krux
February 23, 2026
Microsoft Adds xAI's Grok to Copilot Studio
Published: February 23, 2026 at 12:27 AM
Updated: February 23, 2026 at 12:27 AM
100-word summary
Microsoft Copilot Studio now offers Grok 4.1 Fast in preview for US-based teams after admin opt-in. The model delivers a 2-million-token context window and cuts hallucinations by roughly 3x versus its predecessor, designed for complex workflows requiring deep tool integration. It comes in reasoning and non-reasoning modes, supports function calling across finance, healthcare, law, and science domains, but generates text only. Customer data stays unretained and isn't used for training. US organizations can pilot large-context agent workflows this week under xAI's governance terms, then expand regionally after readiness reviews.
What happened
Microsoft Copilot Studio now offers Grok 4.1 Fast in preview for US-based teams after admin opt-in. The model delivers a 2-million-token context window and cuts hallucinations by roughly 3x versus its predecessor, designed for complex workflows requiring deep tool integration. It comes in reasoning and non-reasoning modes, supports function calling across finance, healthcare, law, and science domains, but generates text only. Customer data stays unretained and isn't used for training.
Why it matters
US organizations can pilot large-context agent workflows this week under xAI's governance terms, then expand regionally after readiness reviews.