There is Microsoft Copilot, which replaced Bing Chat, Cortana and uses OpenAI’s GPT-4 and 5 models.
There is Github Copilot, the coding autocomplete tool.
There is Microsoft 365 Copilot, what they now call Office with built in GenAI stuff.
There is also a Copilot cli that lets you use whatever agent/model backend you want too?
Everything is Copilot. Laptops sell with Copilot buttons now.
It is not immediately clear what version of Copilot someone is talking about. 99% of my experience is with the Office and it 100% fails to do the thing it was advertised to do 2 years ago when work initially got the subscription. Point it a SharePoint/OneDrive location, a handful of excel spreadsheets and pdfs/word docs and tell it to make a PowerPoint presentation based on that information.
It cannot do this. It will spit out nonsense. You have to hold it by the hand tell it everything to do step by step to the point that making the PowerPoint presentation yourself is significantly faster because you don’t have to type out a bunch of prompts and edit it’s garbage output.
And now it’s clear they aren’t even dogfooding their own LLM products so why should anyone pay for Copilot?
No, there is Github Copilot, the AI agent tool that also has autocomplete, and a chat UI.
I understand your point about naming, but it's always helpful to know what the products do.
GitHub Copilot is a service, you can buy subscription from here https://github.com/features/copilot.
GitHub Copilot is available from website https://github.com/copilot together with services like Spark (not available from other places), Spaces, Agents etc.
GitHub Copilot is VSCode extension which you can download at https://marketplace.visualstudio.com/items?itemName=GitHub.c... and use from VSCode.
New version has native "Claude Code" integration for Anthropic models served via GitHub Copilot.
You can also use your own ie. local llama.cpp based provider (if your github copilot subscription has it enabled / allows it at enterprise level).
Github Copilot CLI is available for download here https://github.com/features/copilot/cli and it's command line interface.
Copilot for Pull Requests https://githubnext.com/projects/copilot-for-pull-requests
Copilot Next Edit Suggestion https://githubnext.com/projects/copilot-next-edit-suggestion...
Copilot Workspace https://githubnext.com/projects/copilot-workspace/
Copilot for Docs https://githubnext.com/projects/copilot-for-docs/
Copilot Completions CLI https://githubnext.com/projects/copilot-completions-cli/
Copilot Voice https://githubnext.com/projects/copilot-voice/
GitHub Copilot Radar https://githubnext.com/projects/copilot-radar/
Copilot View https://githubnext.com/projects/copilot-view/
Copilot Labs https://githubnext.com/projects/copilot-labs/
This list doesn't include project names without Copilot in them like "Spark" or "Testpilot" https://githubnext.com/projects/testpilot etc.
This absolutely sucks, especially since tool calling uses tokens really really fast sometimes. Feels like a not-so-gentle nudge to using their 'official' tooling (read: vscode); even though there was a recent announcement about how GHCP works with opencode: https://github.blog/changelog/2026-01-16-github-copilot-now-...
No mention of it being severely gimped by the context limit in that press release, of course (tbf, why would they lol).
However, if you go back to aider, 128K tokens is a lot, same with web chat... not a total killer, but I wouldn't spend my money on that particular service with there being better options!