diff --git a/aider/models/openrouter.py b/aider/models/openrouter.py
index 4f6c9e1dc..59a099876 100644
--- a/aider/models/openrouter.py
+++ b/aider/models/openrouter.py
@@ -28,9 +28,9 @@ class OpenRouterModel(Model):
         found = next((details for details in cached_model_details if details.get('id') == name), None)
 
         if found:
-            self.max_context_tokens = int(found.context_length)
-            self.prompt_price = float(found.get('pricing').get('prompt')) * 1000
-            self.completion_price = float(found.get('pricing').get('completion')) * 1000
+            self.max_context_tokens = int(found.get('context_length'))
+            self.prompt_price = round(float(found.get('pricing').get('prompt')) * 1000,6)
+            self.completion_price = round(float(found.get('pricing').get('completion')) * 1000,6)
 
         else:
             raise ValueError(f'invalid openrouter model: {name}')
diff --git a/tests/test_models.py b/tests/test_models.py
index 1b826b29b..04f8bce81 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -1,6 +1,7 @@
 import unittest
+from unittest.mock import patch
 
-from aider.models import Model
+from aider.models import Model, OpenRouterModel
 
 
 class TestModels(unittest.TestCase):
@@ -23,12 +24,31 @@ class TestModels(unittest.TestCase):
         model = Model.create("gpt-4-32k-2123")
         self.assertEqual(model.max_context_tokens, 32 * 1024)
 
-    def test_openrouter_models(self):
+
+    @patch('openai.Model.list')
+    def test_openrouter_model_properties(self, mock_model_list):
         import openai
         openai.api_base = 'https://openrouter.ai/api/v1'
-        model = Model.create("gpt-3.5-turbo")
-        self.assertEqual(model.name, 'openai/gpt-3.5-turbo')
+        mock_model_list.return_value = {
+            'data': [
+                {
+                    'id': 'openai/gpt-4',
+                    'object': 'model',
+                    'context_length': '8192',
+                    'pricing': {
+                        'prompt': '0.00006',
+                        'completion': '0.00012'
+                    }
+                }
+            ]
+        }
+        mock_model_list.return_value = type('', (), {'data': mock_model_list.return_value['data']})()
 
+        model = OpenRouterModel("gpt-4")
+        self.assertEqual(model.name, 'openai/gpt-4')
+        self.assertEqual(model.max_context_tokens, 8192)
+        self.assertEqual(model.prompt_price, 0.06)
+        self.assertEqual(model.completion_price, 0.12)
 
 if __name__ == "__main__":
     unittest.main()