Microsoft has started a limited preview that places the Grok model inside Word, Excel, and PowerPoint. The rollout occurs through the Microsoft Frontier program and reaches only enterprise customers. Those customers gain a model option that stands apart from the OpenAI and Anthropic choices already present in the same applications.
The rollout
Until this preview, Microsoft 365 Copilot and related features relied mainly on models supplied by OpenAI. Anthropic models entered later as extra choices. The new preview leaves the existing models in place and adds Grok as a third selection. Delivery stays restricted to Frontier program participants and does not extend to the wider Microsoft 365 customer base.
The integration appears first in Word, Excel, and PowerPoint. Enterprise users in the Frontier program can pick the Grok model when they call Copilot features inside those three applications. No schedule for broader release has been announced, and the effort remains a limited preview. The step forms part of Microsoft’s stated approach of offering customers model options instead of locking them to one default.
Limited scope and next steps
The preview does not alter how most organizations use Copilot today. Users outside the Frontier program continue with the OpenAI and Anthropic defaults they already have. Inside the preview group, the change is simply the addition of one more selectable model when invoking Copilot in the three core productivity apps. No performance benchmarks, pricing adjustments, or data-handling differences have been disclosed at this stage.
The move aligns with Microsoft’s pattern of testing multiple model providers in controlled settings before any wider decision. Frontier program participants receive early access while the company gathers feedback on how the Grok model performs on real enterprise workloads inside familiar Office interfaces.
Why it matters
Enterprise buyers who have pressed for more control over underlying models now see one concrete alternative appear inside the applications they open every day. The restricted rollout means the majority of organizations will keep operating under the current defaults for the foreseeable future. Over time, however, the presence of Grok inside Office tools can change the terms on which Microsoft negotiates with model providers and the criteria customers use to judge model suitability for their own data.
The preview therefore serves as an early marker of a sustained multi-model direction rather than an immediate swap of one provider for another. Customers who value choice gain a practical way to compare outputs on the same tasks without leaving Word, Excel, or PowerPoint. Those comparisons, once they accumulate, will shape which models Microsoft keeps, expands, or drops in future updates to Copilot.
The limited nature of the current release also keeps risk contained. Organizations that prefer to stay with proven defaults face no disruption, while the Frontier cohort supplies data that can inform later decisions. This measured approach reflects the reality that model performance still varies by task and by dataset, and enterprises need time to measure those differences inside their own environments.
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Sources:
{
"publisher": "Neowin",
"title": "Microsoft brings Grok to Word, Excel, and PowerPoint as it moves further beyond OpenAI",
"url": "https://www.neowin.net/news/microsoft-brings-grok-to-word-excel-and-powerpoint-as-it-moves-further-beyond-openai/?utm_source=rss",
"published_at": "2026-09-13T17:42:01.000Z",
"summary": "Initially launching in limited preview via the Microsoft Frontier program, the Grok model rollout gives enterprise users an alternative to default models from OpenAI and Anthropic. Read more..."
}
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