diff --git a/aider/models/model.py b/aider/models/model.py
index 9f48f4a79..f7169557e 100644
--- a/aider/models/model.py
+++ b/aider/models/model.py
@@ -11,15 +11,14 @@ class Model:
 
     prompt_price = None
     completion_price = None
-    openai=None
 
     @classmethod
-    def create(cls, name, **kwargs):
+    def create(cls, name):
         from .openai import OpenAIModel
         from .openrouter import OpenRouterModel
         if ("openrouter.ai" in openai.api_base):
-            return OpenRouterModel(name, **kwargs)
-        return OpenAIModel(name, **kwargs)
+            return OpenRouterModel(name)
+        return OpenAIModel(name)
 
     def __str__(self):
         return self.name
diff --git a/aider/models/openrouter.py b/aider/models/openrouter.py
index 59a099876..8306c136f 100644
--- a/aider/models/openrouter.py
+++ b/aider/models/openrouter.py
@@ -21,7 +21,6 @@ class OpenRouterModel(Model):
         # TODO: figure out proper encodings for non openai models
         self.tokenizer = tiktoken.get_encoding("cl100k_base")
 
-        # TODO cache the model list data to speed up using multiple models
         global cached_model_details
         if cached_model_details == None:
             cached_model_details = openai.Model.list().data
diff --git a/tests/test_models.py b/tests/test_models.py
index 04f8bce81..6856a9827 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -28,6 +28,7 @@ class TestModels(unittest.TestCase):
     @patch('openai.Model.list')
     def test_openrouter_model_properties(self, mock_model_list):
         import openai
+        old_base = openai.api_base
         openai.api_base = 'https://openrouter.ai/api/v1'
         mock_model_list.return_value = {
             'data': [
@@ -49,6 +50,7 @@ class TestModels(unittest.TestCase):
         self.assertEqual(model.max_context_tokens, 8192)
         self.assertEqual(model.prompt_price, 0.06)
         self.assertEqual(model.completion_price, 0.12)
+        openai.api_base = old_base
 
 if __name__ == "__main__":
     unittest.main()