Github Copilot is likely running models at or close to cost, given that Azure serves all those models. I haven't used Copilot in several months so I can't speak to its performance. My perception back then was that its underperformance relative to peers was because Microsoft was relatively late to the agentic coding game.
> Or is the performance of those models also worse there?
The context and output limit is heavily shrunk down on github copilot[0].
That's the reason why for example Sonnet 4.5 performs noticeably worse under copilot than in claude code.
