diff --git a/src/libs/AutoSDK/Helpers/OpenApi31Support.cs b/src/libs/AutoSDK/Helpers/OpenApi31Support.cs
index 85dbf717dc..b57c1d780c 100644
--- a/src/libs/AutoSDK/Helpers/OpenApi31Support.cs
+++ b/src/libs/AutoSDK/Helpers/OpenApi31Support.cs
@@ -330,6 +330,14 @@ private static void ConvertYamlNode(Dictionary<object, object?> node)
                 node.Remove(keyString);
             }
             
+            if (keyString == "enum" &&
+                entry.Value is List<object?> { Count: > 0 } enumItems &&
+                enumItems.Contains(null))
+            {
+                node[new string("enum".ToCharArray())] = enumItems.Where(v => v != null).ToList();
+                node[new string("nullable".ToCharArray())] = true;
+            }
+            
             // Remove "prefixItems"
             if (keyString == "prefixItems" && entry.Value is List<object?> { Count: > 0 } prefixItemsList)
             {
diff --git a/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/ValidationTests.Validation_NewWarnings.verified.txt b/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/ValidationTests.Validation_NewWarnings.verified.txt
index 8ed7b6e1ac..ad47dbb93f 100644
--- a/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/ValidationTests.Validation_NewWarnings.verified.txt
+++ b/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/ValidationTests.Validation_NewWarnings.verified.txt
@@ -1,12 +1 @@
-[
-  {
-    RuleName: SchemaMismatchedDataType,
-    Message: Data and type mismatch found.,
-    Pointer: #/components/schemas/FineTuneEvent/properties/level/enum/0
-  },
-  {
-    RuleName: SchemaMismatchedDataType,
-    Message: Data and type mismatch found.,
-    Pointer: #/components/schemas/FinetuneEventLevels/enum/0
-  }
-]
\ No newline at end of file
+[]
\ No newline at end of file
diff --git a/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/_.verified.txt b/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/_.verified.txt
index 6f5f9b3979..8dfb9ff5d6 100644
--- a/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/_.verified.txt
+++ b/src/tests/AutoSDK.UnitTests/Snapshots/Validation/ConvertedSpecs/together.yaml/_.verified.txt
@@ -823,13 +823,13 @@
           type: string
         level:
           enum:
-            - null
             - info
             - warning
             - error
             - legacy_info
             - legacy_iwarning
             - legacy_ierror
+          nullable: true
           type: string
         message:
           type: string
@@ -904,8 +904,8 @@
           type: string
         object:
           enum:
-            - null
             - local
+          nullable: true
         size:
           type: integer
       type: object
@@ -935,13 +935,13 @@
       type: object
     FinetuneEventLevels:
       enum:
-        - null
         - info
         - warning
         - error
         - legacy_info
         - legacy_iwarning
         - legacy_ierror
+      nullable: true
       type: string
     FinetuneEventType:
       enum: