Comment by maestrae

According to this (1), they are using the 4o model. And looks like you'll be able to pick your model(2) in the starting with version 1.94 released this September.

1.https://code.visualstudio.com/updates/v1_92#_github-copilot

2.https://code.visualstudio.com/updates/v1_94#_switch-language...