# How GPT functions work in shared spreadsheets

The Google Sheets permission system affects how you can use GPT functions in a shared spreadsheet. Your user role determines which actions you can perform and whose credits are consumed.

## Google Sheets roles and permissions

| Role        | Definition                                                                                                                                                                                                                                                                   |
| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Creator** | User who created the spreadsheet. You can find out who the Creator of a spreadsheet is by checking the [file activity](https://support.google.com/drive/answer/2409045). In My Drive, the Creator is the Owner unless the Creator has transferred ownership to another user. |
| **Owner**   | User who owns the spreadsheet (My Drive only). By default, the Creator is the Owner. To check who the Owner is, click the **Share** button in the top-right corner of the spreadsheet. In Shared Drive, there is no Owner role.                                              |
| **Editor**  | User who has been granted access to edit the spreadsheet. In Shared Drive, Editors are members with [Contributor access or higher](https://support.google.com/a/users/answer/12380484?hl=en#access).                                                                         |
| **User**    | Any person with access to the spreadsheet (Creator, Owner, or Editor).                                                                                                                                                                                                       |

## Permissions and credits

- Who can do what with GPT functions in a shared spreadsheet depends on user Google Sheets roles and the spreadsheet location (My Drive or Shared Drive).
- **GPT functions always consume the credits of the spreadsheet Owner (My Drive) or Creator (Shared Drive), regardless of who uses them.** If the Owner/Creator is a member of another user's space, GPT functions consume that space's credits. [Learn more.](https://autosheet.com/docs/resources/guides/concepts#space)

| Location         | Who can enable GPT functions? | Who can use GPT functions? | Who can change model settings? | Whose credits are consumed? |
| ---------------- | ----------------------------- | -------------------------- | ------------------------------ | --------------------------- |
| **My Drive**     | Creator                       | Creator, Owner, Editor     | Owner                          | Owner                       |
| **Shared Drive** | Creator                       | Creator, Editor            | Creator                        | Creator                     |

> **Info**
>
> Editors can override the model and creativity level for individual formulas using [GPT function parameters](https://autosheet.com/docs/gpt-for-sheets/gpt-functions/reference), but only the Creator or Owner can change the model settings for the spreadsheet.