diff --git a/ldai/client.py b/ldai/client.py
index b3708da..e2d53a2 100644
--- a/ldai/client.py
+++ b/ldai/client.py
@@ -21,13 +21,15 @@ class ModelConfig:
     Configuration related to the model.
     """
 
-    def __init__(self, id: str, parameters: Optional[Dict[str, Any]] = None):
+    def __init__(self, id: str, parameters: Optional[Dict[str, Any]] = None, custom: Optional[Dict[str, Any]] = None):
         """
         :param id: The ID of the model.
         :param parameters: Additional model-specific parameters.
+        :param custom: Additional customer provided data.
         """
         self._id = id
         self._parameters = parameters
+        self._custom = custom
 
     @property
     def id(self) -> str:
@@ -51,6 +53,15 @@ def get_parameter(self, key: str) -> Any:
 
         return self._parameters.get(key)
 
+    def get_custom(self, key: str) -> Any:
+        """
+        Retrieve customer provided data.
+        """
+        if self._custom is None:
+            return None
+
+        return self._custom.get(key)
+
 
 class ProviderConfig:
     """
@@ -128,9 +139,11 @@ def config(
         model = None
         if 'model' in variation and isinstance(variation['model'], dict):
             parameters = variation['model'].get('parameters', None)
+            custom = variation['model'].get('custom', None)
             model = ModelConfig(
                 id=variation['model']['id'],
-                parameters=parameters
+                parameters=parameters,
+                custom=custom
             )
 
         enabled = variation.get('_ldMeta', {}).get('enabled', False)
diff --git a/ldai/testing/test_model_config.py b/ldai/testing/test_model_config.py
index 8bf902a..6f97a4d 100644
--- a/ldai/testing/test_model_config.py
+++ b/ldai/testing/test_model_config.py
@@ -13,7 +13,7 @@ def td() -> TestData:
         td.flag('model-config')
         .variations(
             {
-                'model': {'id': 'fakeModel', 'parameters': {'temperature': 0.5, 'maxTokens': 4096}},
+                'model': {'id': 'fakeModel', 'parameters': {'temperature': 0.5, 'maxTokens': 4096}, 'custom': {'extra-attribute': 'value'}},
                 'provider': {'id': 'fakeProvider'},
                 'messages': [{'role': 'system', 'content': 'Hello, {{name}}!'}],
                 '_ldMeta': {'enabled': True, 'versionKey': 'abcd'},
@@ -117,6 +117,14 @@ def test_model_config_delegates_to_properties():
     assert model.id == model.get_parameter('id')
 
 
+def test_model_config_handles_custom():
+    model = ModelConfig('fakeModel', custom={'extra-attribute': 'value'})
+    assert model.id == 'fakeModel'
+    assert model.get_parameter('extra-attribute') is None
+    assert model.get_custom('non-existent') is None
+    assert model.get_custom('id') is None
+
+
 def test_model_config_interpolation(ldai_client: LDAIClient, tracker):
     context = Context.create('user-key')
     default_value = AIConfig(