# Choose the default app model

**Settings → AI Assistant** provides the default model preference used when a new app starts. Choose from the models offered by the workspace catalogue.

## Change the preference

Open Settings, find AI Assistant, and choose the model. Wait for the change to save. When creating a new app, inspect its model choice and processing requirements rather than assuming all models offer identical capabilities.

An app needing image input must use a model route that supports it. Structured extraction can also have its own allowed-model policy and resource limits.

## Three different choices

The Assistant composer's model controls a conversation. This preference controls a new app's starting choice. A particular app or workflow step can have its own saved model policy. Updating the default does not silently rewrite existing workflows or change all active conversations.

## Missing or unavailable models

If a saved model is no longer offered, its identifier can remain visible until you choose another. Strive does not silently substitute a new model for the saved preference. If the model catalogue cannot load, use Retry; the rest of the workspace can remain usable.

If generation fails after selecting an available model, inspect the workflow's error and budget. A catalogue entry confirms that a route is offered; it does not guarantee that an individual request is within its limits or that an answer is correct.