Best AI app for Windows: ChatGPT wins, and 7 apps checked on ARM, shortcuts and the Store

Which AI app is best on Windows? ChatGPT for most people, Copilot for one key

OpenAI's Microsoft Store listing ships x64 and ARM64 builds, so one download covers Intel, AMD and Snapdragon laptops. Its Free plan includes "Unlimited text chats" as of October 2026, per OpenAI's pricing page, and the same free app carries limited Codex and ChatGPT Work access. Copilot ties it on price and on ARM64. ChatGPT gets our pick for the extras: a coding agent and a document mode come in the one free download. Copilot is the app most people already have. Microsoft's Windows shortcut list says Win + C or the Copilot key opens it on Windows 11.

Copilot's lead partly reflects time and placement. Its Store listing has been up since April 2024, and new keyboards carry a Copilot key. Search the Store for Copilot, though, and a different listing comes first: Microsoft's work app, also titled Microsoft Copilot, with 197,861 ratings. The chart counts the consumer app, Microsoft Copilot on Windows. ChatGPT's count is split in two. In July 2026 OpenAI renamed its first Windows app ChatGPT Classic and put new features in a new ChatGPT app. Its help article on the move says you can keep Classic, with "no migration is required at launch." Claude's listing only went up on 30 September 2026, so its 18 ratings say little about quality, and Gemini isn't in the chart at all, because Google sends Windows users to its own download page instead of the Store.

How do Windows AI apps compare on ARM, shortcuts and the Microsoft Store?

We read each app's Microsoft Store product data and its maker's download or help page on 12 October 2026. An ARM64 build runs natively on a Snapdragon laptop instead of through emulation:

All five chat apps in the table now ship ARM64 builds, so a Snapdragon laptop doesn't narrow your choice. The size of the download does differ. The new ChatGPT app is a 1.02 GB download, about 3.5 times Claude's 294 MB. It bundles Chat, ChatGPT Work and the Codex coding agent in one app. Gemini is the only big chat app you can't get from the Store. Google's download page says it "Runs on Windows 10 or later (x64 and ARM64)."

Why does Alt + Space open the wrong AI app?

Alt + Space opens whichever AI app claimed it first. ChatGPT Classic and Gemini both ship with it as their default. Windows itself maps Alt + Spacebar to "Open the context menu for the active window." Microsoft gave Copilot the same keys in December 2024. Its Windows Insider post explained what happens when apps collide: "Windows will register whichever app is launched first on your PC and running in the background" as the one the keys open. That's a race, not a setting.

So pick one app for Alt + Space and move all of the others to new keys. In ChatGPT Classic, the setting sits under Settings > App > Companion window hotkey. OpenAI's help page warns that the shortcut "will not work if it is already registered with another Windows application." Copilot's Store listing now advertises Win + C instead. Gemini's keys move too. Google's launch post, dated 10 September 2026, sets Alt + Space as the default, and its desktop page says "You can customise your shortcut keys at any time in the Gemini app settings." Claude's listing promises you can "Open Claude from any app with a keyboard shortcut" but doesn't name the keys, and Anthropic's quick entry help page covers only the Mac.

Which Windows AI app is best for what you do?

Each of these apps wins for one kind of user. Page-one lists run to 25 picks because they add photo upscalers and code editors; we kept to the apps you'd install to chat with a model. We took every pick from the app's own listing or help page, and gave each one a losing case from the same sources:

Whizi, which publishes this page, has no Windows app at all. It runs in a browser tab at whizi.io with nothing to install, so it loses on everything this page checks. There's no Store listing and no shortcut, and it can't answer offline. What it does differently is put several model families on one plan, from a catalog of 280+ models. Pro at $29.99 a month reaches Claude Opus, Claude Sonnet, ChatGPT Sol and Gemini Flash, and can run them side by side.

xAI, Meta and DeepSeek don't publish a Windows app in the Microsoft Store. A Store search for Grok on 12 October 2026 put a third party app called GX.AI first, with about 1,000 ratings. Its own listing says "This application is not an official app of GROK/SpaceXAI." Skip it. All three of them have web apps that work in any Windows browser, so use those instead.

On a phone the picks change. Our iPhone ranking and Android ranking use App Store and Play data, and our Mac ranking does the same job for macOS. Copilot vs ChatGPT goes deeper on the two Windows defaults.

Do you need a Copilot+ PC to use AI on Windows? No

No. ChatGPT, Claude, Gemini and Perplexity run their models in the cloud, and none of their listings asks for more than Windows 10 build 19041. A Copilot+ PC matters only for the AI features Windows runs on the device itself. Microsoft's developer guide defines one as Windows 11 hardware with an NPU that "can perform more than 40 trillion operations per second (TOPS)."

Running a model on your own PC is a different job, and it asks a lot more of the hardware. LM Studio says "At least 16GB of RAM is recommended," plus 4 GB of dedicated graphics memory. Ollama needs Windows 10 22H2 or newer and 4 GB of disk before you add a single model. It wants NVIDIA driver 551.61 or newer if you have an NVIDIA card. Our open source LLM guide covers the models these apps run and what each one costs.