Microsoft just put Grok inside Word, Excel, and PowerPoint.

Microsoft is adding xAI’s Grok models to Copilot across Word, Excel, and PowerPoint.

The models are initially available through the model picker for Microsoft Frontier users as a preview.

And Microsoft’s Copilot strategy is starting to look less like an OpenAI partnership and more like an AI model marketplace.

OpenAI helped Microsoft get an enormous head start in generative AI.

Now Microsoft increasingly looks determined to make sure it doesn’t depend on OpenAI to keep it.

Here’s the real story:

Microsoft isn’t forcing users into one AI ecosystem anymore.

Copilot users can now choose between models from OpenAI, Anthropic, and xAI, selecting GPT, Claude, or Grok depending on what they’re trying to accomplish.

That’s a big change in how Microsoft is positioning Copilot.

Instead of betting everything on having the best model, Microsoft can own the interface where all the best models compete for your work.