Set your default model
models and endpoints
// what it does
Put "defaultModel" in ~/.grok/user-settings.json to pick the model used when no flag or env var is set, and list the ones you switch between under "models" so they appear in the /models picker. A per-project "model" in .grok/settings.json overrides this default. Resolution runs project model → user defaultModel → system default grok-code-fast-1.
// shell
$ ~/.grok/user-settings.json