GitHub Copilot in vscode has two ways to access Opus: the Copilot harness or the Claude Code Agent SDK within Copilot.

And that's if we assume that the vscode GHCP default Agent ("Local") is the same as the "Copilot CLI" one that is also selectable in vscode. I have not tried that one.

A few weeks ago the Claude Code Agent SDK was much better than the default Copilot Agent, but nowadays I am not sure.