# Selecting the active model for the entity type

Before you can use a model-based entity type, you must select the model to use.

On the model list page, the active model is marked as **Active**.

To change the active version:

1. Hover the mouse over the model to make the active model for the entity type.
2. Click **Activate**.

<figure><img src="/files/XtbMuc8tYkZiRnTrCnhN" alt=""><figcaption><p>Activate option to select the active model for a model-based custom entity type</p></figcaption></figure>


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.tonic.ai/textual/entity-types/entity-type-custom-model/entity-type-model-set-active.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.