# BuildSessionGUID

> A unique identifier for the build session in the Unity Editor.

## Definition

* **Type:** Field
* **Namespace:** [UnityEditor.Build](/engine/6000.7/script-reference/unityeditor/build.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public GUID BuildSessionGUID
```

### Remarks

This identifier uniquely identifies each build session, regardless of whether the build produces identical output. Failed or cancelled builds will also have a unique session GUID. This identifier is used in the [BuildHistory](/engine/6000.7/script-reference/unityeditor/build/buildhistory.md) API as the main key to look up additional build information.

This identifier is not stored in the built output.