diff --git a/tests/basic/test_models.py b/tests/basic/test_models.py
index 9a263a29d..9f86b4749 100644
--- a/tests/basic/test_models.py
+++ b/tests/basic/test_models.py
@@ -329,65 +329,7 @@ class TestModels(unittest.TestCase):
         self.assertEqual(model.editor_edit_format, "editor-diff")
         self.assertTrue(model.use_repo_map)
 
-    def test_remove_reasoning_content(self):
-        # Test with no removal configured
-        model = Model("gpt-4")
-        text = "Here is <think>some reasoning</think> and regular text"
-        self.assertEqual(model.remove_reasoning_content(text), text)
 
-        # Test with removal configured
-        model = Model("deepseek-r1")  # This model has remove_reasoning="think"
-        text = """Here is some text
-<think>
-This is reasoning that should be removed
-Over multiple lines
-</think>
-And more text here"""
-        expected = """Here is some text
-
-And more text here"""
-        self.assertEqual(model.remove_reasoning_content(text), expected)
-
-        # Test with multiple reasoning blocks
-        text = """Start
-<think>Block 1</think>
-Middle
-<think>Block 2</think>
-End"""
-        expected = """Start
-
-Middle
-
-End"""
-        self.assertEqual(model.remove_reasoning_content(text), expected)
-
-        # Test with no reasoning blocks
-        text = "Just regular text"
-        self.assertEqual(model.remove_reasoning_content(text), text)
-
-    @patch("aider.models.litellm.completion")
-    def test_simple_send_with_retries_removes_reasoning(self, mock_completion):
-        model = Model("deepseek-r1")  # This model has remove_reasoning="think"
-
-        # Mock the completion response
-        mock_response = MagicMock()
-        mock_response.choices = [MagicMock(message=MagicMock(content="""Here is some text
-<think>
-This reasoning should be removed
-</think>
-And this text should remain"""))]
-        mock_completion.return_value = mock_response
-
-        messages = [{"role": "user", "content": "test"}]
-        result = model.simple_send_with_retries(messages)
-
-        expected = """Here is some text
-
-And this text should remain"""
-        self.assertEqual(result, expected)
-
-        # Verify the completion was called
-        mock_completion.assert_called_once()
 
     def test_aider_extra_model_settings(self):
         import tempfile
diff --git a/tests/basic/test_reasoning.py b/tests/basic/test_reasoning.py
index fd44af80d..bb6d6ce43 100644
--- a/tests/basic/test_reasoning.py
+++ b/tests/basic/test_reasoning.py
@@ -5,6 +5,7 @@ from aider.coders.base_coder import Coder
 from aider.dump import dump  # noqa
 from aider.io import InputOutput
 from aider.models import Model
+from aider.reasoning_tags import remove_reasoning_content
 
 
 class TestReasoning(unittest.TestCase):
@@ -341,6 +342,66 @@ class TestReasoning(unittest.TestCase):
                 reasoning_pos, main_pos, "Reasoning content should appear before main content"
             )
 
+    def test_remove_reasoning_content(self):
+        """Test the remove_reasoning_content function from reasoning_tags module."""
+        # Test with no removal configured
+        text = "Here is <think>some reasoning</think> and regular text"
+        self.assertEqual(remove_reasoning_content(text, None), text)
+
+        # Test with removal configured
+        text = """Here is some text
+<think>
+This is reasoning that should be removed
+Over multiple lines
+</think>
+And more text here"""
+        expected = """Here is some text
+
+And more text here"""
+        self.assertEqual(remove_reasoning_content(text, "think"), expected)
+
+        # Test with multiple reasoning blocks
+        text = """Start
+<think>Block 1</think>
+Middle
+<think>Block 2</think>
+End"""
+        expected = """Start
+
+Middle
+
+End"""
+        self.assertEqual(remove_reasoning_content(text, "think"), expected)
+
+        # Test with no reasoning blocks
+        text = "Just regular text"
+        self.assertEqual(remove_reasoning_content(text, "think"), text)
+
+    @patch("aider.models.litellm.completion")
+    def test_simple_send_with_retries_removes_reasoning(self, mock_completion):
+        """Test that simple_send_with_retries correctly removes reasoning content."""
+        model = Model("deepseek-r1")  # This model has remove_reasoning="think"
+
+        # Mock the completion response
+        mock_response = MagicMock()
+        mock_response.choices = [MagicMock(message=MagicMock(content="""Here is some text
+<think>
+This reasoning should be removed
+</think>
+And this text should remain"""))]
+        mock_completion.return_value = mock_response
+
+        messages = [{"role": "user", "content": "test"}]
+        result = model.simple_send_with_retries(messages)
+
+        expected = """Here is some text
+
+And this text should remain"""
+        self.assertEqual(result, expected)
+
+        # Verify the completion was called
+        mock_completion.assert_called_once()
+
 
 if __name__ == "__main__":
     unittest.main()