Microsoft is bringing xAI’s Grok model into Word, Excel, and PowerPoint, according to a report from Neowin. The rollout marks another step in Microsoft’s push to offer AI models beyond its long-standing OpenAI partnership, and it positions Grok in Microsoft 365 as a genuine alternative to the OpenAI- and Anthropic-powered features that currently drive Copilot.
What’s changing with Grok in Microsoft 365
The headline shift is that Grok will become an available model choice inside three of Microsoft’s most-used productivity apps. Rather than being locked into the default AI assistant backed by OpenAI, users in the preview will be able to route certain tasks through Grok, xAI’s model built by Elon Musk’s company.
For now, the change is limited. Microsoft is launching this in a preview rather than a full, default-enabled release, which means the feature will be available to a subset of users while the company gathers feedback and watches for quality or safety issues.
What specific actions Grok will handle inside each app isn’t fully detailed in the initial reporting, but the expectation is that generative tasks — drafting text in Word, working with data in Excel, and building slides in PowerPoint — could draw on Grok as an option alongside the existing OpenAI-backed capabilities.
The Microsoft Frontier program and preview rollout
The rollout is happening through what Microsoft is calling the Frontier program. According to the report, this is the vehicle through which Grok is initially being made available in a limited preview, rather than being pushed to every Microsoft 365 customer at once.
A preview through a named program typically signals that Microsoft is testing the integration in a controlled way before deciding whether to widen access. Enterprise users are the primary audience, which fits with how Microsoft has approached other model diversification efforts — offering new options to organizations first before broadening them.
The limited nature of the preview matters for timing. If you’re expecting Grok to show up in your apps tomorrow, this isn’t a blanket release yet. It’s a staged rollout aimed at early enterprise adopters.
Why Microsoft is diversifying beyond OpenAI
This move sits within a broader shift in Microsoft’s AI strategy. For years, Copilot and many of Microsoft’s consumer and enterprise AI features have been powered primarily by OpenAI, the company Microsoft has a deep investment and partnership with.
Microsoft did not stop there, though. It also brought in Anthropic’s Claude as an option in some products, giving users and organizations a second major model to choose from. Adding Grok extends that pattern further, giving enterprises at least three distinct model providers to draw from.
From a business standpoint, diversifying model providers reduces Microsoft’s dependence on any single vendor and lets organizations pick models that fit their needs, pricing, or data-residency requirements. It also reflects a competitive market where customers increasingly want choice rather than a single default assistant.
What This Means for You
For everyday Windows and Microsoft 365 users, the immediate takeaway is that more choice is coming to the AI tools you already use. If you’ve ever felt that Copilot’s answers lean a certain way because they come from one model, having Grok as an alternative could give you a different style or approach on the same task.
But it’s worth being clear about scope. This preview targets enterprise users, so individual consumers may not see the option for some time — if at all, depending on how Microsoft structures access. And because it’s a preview, you should expect the experience to be incomplete as Microsoft works out the details.
For organizations, the bigger implication is strategic. IT leaders managing AI tooling will want to watch how Grok performs on real workloads, how it fits with their security and compliance posture, and whether it offers a meaningful difference from the OpenAI and Anthropic options already on the table.
How to Get It
Because this is a limited preview through the Microsoft Frontier program aimed at enterprise users, there’s no simple toggle to turn on today for most people. Access will be granted to a subset of enterprise customers as Microsoft stages the rollout.
If you’re an enterprise admin, keep an eye on official Microsoft channels for updates on who the preview is rolling out to and how to opt in. The company typically announces preview availability through its official product blogs and update channels rather than a standalone download.
Until the feature reaches a broader release, the default Copilot experience in Word, Excel, and PowerPoint will remain powered by the existing OpenAI- and Anthropic-backed models. Grok will be an addition, not a replacement.
Source: Neowin
Over to you: Would you switch Copilot’s underlying model to Grok, or are you happy with the current OpenAI- and Anthropic-powered options?
