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Last week you asked Copilot to summarise a long email thread, and it gave you three useful bullets. Then you asked it to draft a careful reply to a tricky complaint, and the result felt a bit flat. Soon, you might be able to pick which AI model (the underlying engine that actually does the thinking) handles each request — a bit like choosing a different chef for a different dish.
Why one AI isn't perfect for everything
Every AI model is built with trade-offs. Some are trained to be fast and cheap — they spin through a long document and give you a summary in seconds. Others are built for deeper reasoning — they think through problems step by step and tend to get trickier tasks right.
No single model is best at everything. A model that's great at quick summarising might be sloppy at careful analysis. A model built for careful analysis might be overkill (and slow) when you just want a quick rewrite of a sentence.
It's the same reason your phone has different camera modes: portrait for faces, landscape for scenery. Different tools for different jobs.
What's changing in Microsoft 365
Microsoft is rolling out a model picker inside Copilot. Instead of being stuck with one default model, you'll see a small choice — usually one tuned for speed, one tuned for reasoning, and sometimes a creative writing model.
For organisations, there's also a governance layer (the rules an IT team sets up to control how AI is used at work). Admins can decide which models are available, which are locked down, and which departments can use which. That matters because some AI models handle sensitive data differently, and some are only safe to use inside certain regions or plans.
For the everyday user, the practical change is simpler: a small dropdown or selector near the prompt box, letting you swap models when you want a different kind of help.
How to think about picking a model
A rough guide:
- Fast / default model — quick summarising, simple rewrites, drafting a quick email. Good for everyday "just get something on the page" tasks.
- Reasoning model — careful analysis, tricky logic, working through a complex spreadsheet, drafting something where accuracy matters more than speed.
- Creative model — brainstorming, opening lines, slogans, marketing copy.
You don't need to memorise this. Start with the default and only switch when the answer feels wrong or shallow for the task.
Wrap-up
Copilot picking the right AI model is mostly an upgrade you don't have to think about — but if you want more control, you now have it. Try the default for your next routine task, then experiment with switching models the next time the answer doesn't feel quite right. That's the simplest way to learn which model fits which job for you.