diff --git a/firebaseai/testapp/Assets/Firebase/Sample/FirebaseAI/UIHandler.cs b/firebaseai/testapp/Assets/Firebase/Sample/FirebaseAI/UIHandler.cs
index 601a0f39..754a1f8c 100644
--- a/firebaseai/testapp/Assets/Firebase/Sample/FirebaseAI/UIHandler.cs
+++ b/firebaseai/testapp/Assets/Firebase/Sample/FirebaseAI/UIHandler.cs
@@ -73,7 +73,7 @@ protected void InitializeFirebase() {
       });
     }
 
-    public string ModelName = "gemini-3.5-flash";
+    public string ModelName = "gemini-3.1-flash-lite";
 
     private int backendSelection = 0;
     private string[] backendChoices = new string[] { "Google AI Backend", "Vertex AI Backend" };