Microsoft's open-weight AI push is so obviously an

What happened

Microsoft has figured out it's better positioned as an AI orchestrator than as an OpenAI reseller. The company is now actively pushing for open-weight models. " Open-weight models are supposed to spur innovation and reduce dependence on a handful of providers. The letter also frames "distillation," in which a smaller AI model learns from a more capable model's output, as a legitimate way to build AI.

Why it matters

"It reflects a long tradition of learning from, building upon, and improving existing technologies, a tradition that has helped drive innovation since the rise of the open-source software movement," the letter states. Chinese providers have faced particular criticism for using distillation, while the Trump administration reportedly plans to take action against Chinese open-weight models. That's likely the main reason Microsoft and the other signatories are speaking up now.

Microsoft's enthusiasm for openness makes more sense when you look at its business model. The company makes money from cloud infrastructure on Azure and the lock-in created by its Windows and Office ecosystem. More models on Azure give customers fewer reasons to use rival AI platforms. Relying less on expensive models from OpenAI and Anthropic also improves Microsoft's margins.

A fragmented model market also stops any single AI lab from becoming powerful enough to threaten Microsoft's cloud and operating system businesses. CEO Satya Nadella wrote on LinkedIn that the key is using "the right model for each task" while keeping costs down. He had previously warned that a few AI models could absorb the value of entire industries.

What to watch

Microsoft is also replacing OpenAI and Anthropic models in GitHub Copilot, Excel, and Outlook with its in-house MAI family. Whether customers benefit from that swap is questionable. 2. Copilot customers are getting weaker AI for the same price, while Microsoft pockets better margins. 6" without specifying whether that means Sol, Terra, Luna, or which reasoning mode it runs at.

That's not how you do benchmarks, and Microsoft's "superintelligence team," which made the comparison, certainly knows it. Microsoft doesn't even try to hide that this is about cutting costs. " More MAI models are planned for Copilot Chat, Outlook, and PowerPoint.