Microsoft Copilot Major Update: Claude Model Added, Cowork Multi-User AI Goes GA

Microsoft just packed 40-plus updates into its July release of Microsoft 365 Copilot. The two headliners: Anthropic's Claude is now a model option in Copilot Chat, and Cowork — the multi-user collaborative AI feature — hits general availability.

Three Key Takeaways

Claude becomes a Copilot model option. Microsoft 365 subscribers can now select Claude as the underlying model in Copilot Chat for complex analysis, document comprehension, and structured content generation. This means Anthropic's model sits side by side with OpenAI's — the company Microsoft invested $13 billion in — as a user-selectable option inside Microsoft's own productivity suite.

Cowork multi-user AI goes GA. Cowork lets multiple users share a single Copilot session inside Word, Excel, and PowerPoint. A team drafting a proposal can prompt the AI simultaneously — one person requesting data analysis, another adjusting tone — with all inputs and AI responses visible in a shared sidebar in real time. This upgrades AI from "personal assistant" to "team assistant."

AI watermarking ships alongside. New document watermarking automatically tags AI-generated content, enabling traceability between human and AI output in shared files. All updates roll out gradually through July and August to Microsoft 365 subscribers.

WangDou's Take

Microsoft putting Claude inside Copilot looks like "more choice for users," but what it really is, is leverage against the company Microsoft sank $13 billion into. When your productivity suite runs both GPT and Claude, you're no longer any one model provider's exclusive distribution channel — you're a platform, and models become swappable parts. For users, it's genuinely good: Claude's edge in long-document comprehension and GPT's strength in general-purpose chat can each play to their strengths. For OpenAI, it's less comfortable — you thought you were Microsoft's exclusive supplier, and now you're one option on a shelf. Cowork is the more practically useful feature: previously everyone chatted with AI individually and then synced up with each other, and now you just collaborate in a single session, cutting out the "hey, what did AI tell you?" relay. That said, 40-plus updates in one push is classic Microsoft — shipping features faster than users can learn them.

Source: Windows News, AIFOD