/model to open the model picker. The live catalog shows the choices available to your account; model availability and defaults can change.
Choose one model for all phases or set a phase separately. On the web,
/model all <model> applies one model throughout, /model <phase> <model> sets one phase, and /model reset restores automatic choices.
Choosing a model is part of the Premium, Pro, and Team plans; other plans use the automatic choice, and picking a locked model opens Billing. Model settings persist with the project. A phase selection only matters when that phase runs; effort determines the sprint workflow.
/pro has been retired. Use /model for model selection. The Pro plan is a billing plan and is separate from these controls.