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But there isn't a copilot model is there? Just a harnesse, and the vscode copilot extension is pretty good (haven't tried the tui)

Your Copilot free offering isn't the Copilot they're using within the company for coding assistant. It's confusing I know.

Copilot cannot be behind any models because it's a harness, not a model. You can use any of the popular models through it, including Claude models. Though people have been saying that Claude CLI is a better experience.

Copilot is not the same agent as GitHub Copilot.