Microsoft has rolled out a redesigned Microsoft 365 Copilot that the company says loads twice as fast as the previous build, with a stripped-down interface and a new response format meant to be easier to scan. The update went live May 28, 2026 across desktop and mobile clients. Microsoft is also pitching more reliable, more structured outputs as part of the refresh.
The central UI change is what Microsoft calls 'progressive disclosure.' Instead of presenting a wall of tools and controls the moment a session opens, Copilot now surfaces controls based on what the user is actually asking for. A coding prompt and a slide-deck prompt no longer share the same cluttered toolbar.
The prompt box itself has been reworked. Users can format text directly inside the prompt before sending it, and the box expands to fit whatever is typed or pasted in. That removes a long-standing friction where pasting a long document collapsed into an unreadable single-line input.
Key facts
- 01Microsoft says the redesigned 365 Copilot loads twice as fast as the prior version.
- 02The update rolled out May 28, 2026 across desktop and mobile clients.
- 03A new 'progressive disclosure' pattern surfaces tools based on the active prompt instead of showing every control upfront.
- 04Copilot now formats text inside an expanding prompt box and opens in a side panel within Word, Excel, and PowerPoint.
- 05Google shipped a comparable Gemini app redesign the prior week, also restructuring responses by prompt type.
Inside the Office apps, Copilot continues to live in a side panel that can answer questions, suggest edits, and make changes to the open document. The redesign keeps the in-line entry points too: a chat window can be opened from a paragraph in Word, a cell in Excel, or a slide in PowerPoint. The structural model has not changed; the chrome around it has.
The twice-as-fast claim is the headline number, though Microsoft has not disclosed which actions were measured or what the baseline build was. Load time has been a persistent complaint with Copilot inside Office, where users were opening the assistant against documents already loaded into memory and waiting several seconds for the panel to become interactive. A real perceived-latency cut would matter more for daily use than most model upgrades.
The structured-response change is the second substantive shift. Microsoft is moving toward outputs that are easier to skim — more headings, lists, and labeled sections where the prompt warrants it, and flatter prose where it does not. The same idea showed up in Google's Gemini app redesign the prior week, which similarly varies response structure based on the type of question asked.
The redesign sits alongside the 'vibe working' features Microsoft recently added to Word, Excel, and PowerPoint, which let users describe an outcome in natural language and have Copilot assemble the document, model, or deck. Together, the two updates push Copilot from a sidebar Q&A tool toward something that does more of the document construction itself, with the user steering rather than typing.
What is not in the announcement is any benchmark, accuracy figure, or model-version change. Microsoft is not claiming a smarter Copilot here — it is claiming a faster, calmer one. Whether 'more reliable' responses translate into measurable accuracy gains on the kind of spreadsheet and document tasks enterprises run on Copilot is something customers will have to test against their own workloads.
For Microsoft, the redesign is a reminder that enterprise AI adoption is increasingly an interface problem rather than a model problem. The frontier-model gap between Copilot, Gemini, and the standalone ChatGPT app has narrowed considerably, and the deciding factor for a knowledge worker opening Excel at 9am is no longer which model is one benchmark point ahead. It is whether the assistant loads quickly, fits inside the existing workflow, and stops asking the user to navigate a control surface that grows with every release. A faster panel and progressive disclosure are unglamorous changes, but they are the ones that move daily-active usage inside Office — which is the only Copilot metric Microsoft actually needs to defend.
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