diff --git a/llama_stack/providers/utils/inference/litellm_openai_mixin.py b/llama_stack/providers/utils/inference/litellm_openai_mixin.py
index 9fc258880..b69cd822f 100644
--- a/llama_stack/providers/utils/inference/litellm_openai_mixin.py
+++ b/llama_stack/providers/utils/inference/litellm_openai_mixin.py
@@ -40,7 +40,9 @@ from llama_stack.apis.inference.inference import (
     OpenAIMessageParam,
     OpenAIResponseFormatParam,
 )
+from llama_stack.apis.models.models import Model
 from llama_stack.distribution.request_headers import NeedsRequestProviderData
+from llama_stack.exceptions import UnsupportedModelError
 from llama_stack.log import get_logger
 from llama_stack.providers.utils.inference.model_registry import ModelRegistryHelper
 from llama_stack.providers.utils.inference.openai_compat import (
@@ -90,6 +92,12 @@ class LiteLLMOpenAIMixin(
     async def shutdown(self):
         pass
 
+    async def register_model(self, model: Model) -> Model:
+        model_id = self.get_provider_model_id(model.provider_resource_id)
+        if model_id is None:
+            raise UnsupportedModelError(model.provider_resource_id, self.alias_to_provider_id_map.keys())
+        return model
+
     def get_litellm_model_name(self, model_id: str) -> str:
         # users may be using openai/ prefix in their model names. the openai/models.py did this by default.
         # model_id.startswith("openai/") is for backwards compatibility.