I am genuinely curious, does Anthropic use Claude to build claude code and claude desktop? My cc plugin on vscode does not allow me to switch models at all. Al

I am genuinely curious, does Anthropic use Claude to build claude code and claude desktop? My cc plugin on vscode does not allow me to switch models at all. Always defaults to sonnet and says that the /model will take effect on a new session But if I open a new session it's again the same thing. Model is sonnet