Model: Claude · in Microsoft 365 Copilot
On 16 June 2026, Microsoft made Anthropic’s Claude available as a model option inside Microsoft 365 Copilot Chat — so the assistant millions of employees already open every day can now answer from a different model entirely.
What actually changed
As of 16 June 2026, users can select Claude as a model option inside Microsoft 365 Copilot Chat, across Windows, Mac, Web, iOS and Android. Microsoft positions it as added flexibility — Claude is offered for complex analysis, document understanding and structured content generation, sitting alongside the existing models rather than replacing them.
On the surface it is a single new entry in a model dropdown. In practice it changes something more fundamental: the assistant that sits inside Word, Outlook, Teams and the Microsoft 365 Copilot app can now generate its answers from Anthropic’s model instead of the default. Same interface, same prompt box — different engine behind the reply.
Why the model behind Copilot matters
When you ask an assistant to recommend tools, summarise a market or name the leading providers in a category, the answer is not neutral. Each model has its own training, its own retrieval habits and its own instincts about which brands and sources are worth naming. Swap the model and you can swap the shortlist — the question stays identical, but the names that come back may not.
That is exactly what adding Claude to Copilot introduces. A procurement lead, a marketer or an analyst asking Copilot the same question can now get a Claude-generated answer that leans on different evidence and surfaces a different set of brands than Copilot’s previous default would have. For the brand on the receiving end, being visible in Copilot is no longer a single target — it depends on which model the user picked.
Copilot is where the work actually happens
This matters more than a consumer chatbot tweak because of where Copilot lives. Microsoft 365 Copilot is embedded in the tools businesses run on every day — the documents people draft, the inboxes they triage, the meetings they summarise. When employees ask it which vendor to shortlist or how a market breaks down, those answers feed real decisions inside organisations.
So a change to which models can answer inside Copilot is a change to how a large slice of business questions get answered. If Claude names a different set of providers than the previous default, that difference plays out in enterprise workflows, not just in casual chats.
What this means for brands
If you have been monitoring how you appear in Copilot, this is a moment to re-baseline. Any read you built on Copilot’s earlier behaviour now covers only part of the picture, because a share of users will be asking Claude instead. The questions worth asking: when Claude answers inside Copilot, does your brand still get named in your category? Are the cited sources the same, or has the model reached for different publishers? And does the answer differ enough from Copilot’s default that your visibility now depends on the model toggle?
It is part of a wider pattern we have been tracking — the model behind an answer engine quietly shifting underneath the same interface, from the retirement of GPT-5.2 inside ChatGPT to the sudden suspension of Claude Fable 5 and Mythos 5. Each one re-draws which model most people are actually talking to, and adding Claude to Copilot is the same story from a different angle — more model choice, more variation in the answers.
What we’re watching
The clearest signals will show up in the differences between models inside the same assistant. The markers worth following: whether recommendation queries in a category return the same brands under Claude as under Copilot’s default, whether Claude leans on a different set of sources, and how often business users reach for Claude now that it is one tap away. Where those answers diverge, brand visibility diverges with them.
How reconnAI tracks changes like this
reconnAI monitors how the leading AI assistants — ChatGPT, Claude, Gemini, Perplexity, Copilot and Google AI Overview — answer questions across regions, and re-baselines that tracking whenever a platform adds a model or changes how its answers are generated. If you want to see how Copilot represents your brand now that Claude is in the mix, you can get in touch with our team or explore how AI visibility tracking works.
About reconnAI
reconnAI tracks how the major AI models represent topics and sources across ChatGPT, Claude, Gemini, Perplexity, Copilot and Google AI Overview — across multiple regions. We monitor how those models answer and how they change over time, so you can stay ahead of shifts in the AI landscape.