Sidenote but I don't get why you would want to pay github to run Claude on your code.
Yeah github pays Claude but what's the point ?
I use it because they offer absurdly cheap prices that they're clearly losing money on. I can get $1000 at API prices of Opus 4.6, for in the range of $2 my cost through copilot.
Tighter (read better) integration with VSCode and Github than what you could get running claude code on the side.
Your question does raise a valid point - Github Copilot's value proposition is fairly limited in my opinion. Not to say worthless but limited and clearly varies depending on how Githubbey your dev workflows are.
The workflow that GitHub has for prompting agent inside the ide itself is by far and away the nicest and most intuitive I've used.
Claude's integration looked like trash in comparison.
Why would I lock myself into a single vendor when I can have access to all models.
Also the GitHub subscription is a very good price.
From a user point of view there's no real reason for it, from an admin point of view if your team is already using Github Enterprise then deploying it is basically hitting a toggle switch, and it has some more fine grained controls about what it can or can't do compared to Claude Code.
Most corporations have Microsoft already greenlisted as a vendor.
Making it possible to buy something from Anthropic might require tedious paperwork for many of them.
It's massively cheaper. Copilot charges per request, which with some clever prompting, can lead to huge amounts of work being done at fractions of the cost of Claude Code. Millions of tokens for mere pennies. MS must be taking a huge hit somewhere, because I'm probably getting 10-20x my value out of GH relative to CC.
I am not locked in to Anthropic, either. I can easily switch between GPT and Gemini models based on how I think each would perform in various scenarios. That's a big win. I use a lot of design with Opus, implement with GPT 5.4.
Also, Github Copilot CLI is pretty much at feature parity (for the stuff that matters) with Claude Code. Using both at work and home, I don't think there's much difference in features between the two. Maybe I'm not a super power user, and just a regular dumb user, but GH doesn't seem buggy and everything I think I'd want to do with CC I can do with GH.