diff --git a/libs/core/kiln_ai/adapters/langchain_adapters.py b/libs/core/kiln_ai/adapters/langchain_adapters.py
index e336a1a..d07b851 100644
--- a/libs/core/kiln_ai/adapters/langchain_adapters.py
+++ b/libs/core/kiln_ai/adapters/langchain_adapters.py
@@ -112,7 +112,8 @@ async def _run(self, input: Dict | str) -> RunOutput:
                 SystemMessage(content=cot_prompt),
             )
 
-            cot_response = base_model.invoke(messages)
+            cot_messages = [*messages]
+            cot_response = base_model.invoke(cot_messages)
             intermediate_outputs["chain_of_thought"] = cot_response.content
             messages.append(AIMessage(content=cot_response.content))
             messages.append(tool_call_message)
diff --git a/libs/core/kiln_ai/adapters/test_langchain_adapter.py b/libs/core/kiln_ai/adapters/test_langchain_adapter.py
index da8ca78..f210a42 100644
--- a/libs/core/kiln_ai/adapters/test_langchain_adapter.py
+++ b/libs/core/kiln_ai/adapters/test_langchain_adapter.py
@@ -1,6 +1,10 @@
+from unittest.mock import AsyncMock, MagicMock, patch
+
+from langchain_core.messages import AIMessage, HumanMessage, SystemMessage
 from langchain_groq import ChatGroq
 
 from kiln_ai.adapters.langchain_adapters import LangChainPromptAdapter
+from kiln_ai.adapters.prompt_builders import SimpleChainOfThoughtPromptBuilder
 from kiln_ai.adapters.test_prompt_adaptors import build_test_task
 
 
@@ -49,3 +53,72 @@ def test_langchain_adapter_info(tmp_path):
     assert model_info.adapter_name == "kiln_langchain_adapter"
     assert model_info.model_name == "llama_3_1_8b"
     assert model_info.model_provider == "ollama"
+
+
+async def test_langchain_adapter_with_cot(tmp_path):
+    task = build_test_task(tmp_path)
+    lca = LangChainPromptAdapter(
+        kiln_task=task,
+        model_name="llama_3_1_8b",
+        provider="ollama",
+        prompt_builder=SimpleChainOfThoughtPromptBuilder(task),
+    )
+
+    # Mock the base model and its invoke method
+    mock_base_model = MagicMock()
+    mock_base_model.invoke.return_value = AIMessage(
+        content="Chain of thought reasoning..."
+    )
+
+    # Create a separate mock for self.model()
+    mock_model_instance = MagicMock()
+    mock_model_instance.invoke.return_value = AIMessage(content="Final response...")
+
+    # Mock the langchain_model_from function to return the base model
+    mock_model_from = AsyncMock(return_value=mock_base_model)
+
+    # Patch both the langchain_model_from function and self.model()
+    with (
+        patch(
+            "kiln_ai.adapters.langchain_adapters.langchain_model_from", mock_model_from
+        ),
+        patch.object(LangChainPromptAdapter, "model", return_value=mock_model_instance),
+    ):
+        response = await lca._run("test input")
+
+    # Verify the model was created with correct parameters
+    # mock_model_from.assert_awaited_once_with("llama_3_1_8b", "ollama")
+
+    # First 3 messages are the same for both calls
+    for invoke_args in [
+        mock_base_model.invoke.call_args[0][0],
+        mock_model_instance.invoke.call_args[0][0],
+    ]:
+        assert isinstance(
+            invoke_args[0], SystemMessage
+        )  # First message should be system prompt
+        assert (
+            "You are an assistant which performs math tasks provided in plain text."
+            in invoke_args[0].content
+        )
+        assert isinstance(invoke_args[1], HumanMessage)
+        assert "test input" in invoke_args[1].content
+        assert isinstance(invoke_args[2], SystemMessage)
+        assert "step by step" in invoke_args[2].content
+
+    # the COT should only have 3 messages
+    assert len(mock_base_model.invoke.call_args[0][0]) == 3
+    assert len(mock_model_instance.invoke.call_args[0][0]) == 5
+
+    # the final response should have the COT content and the final instructions
+    invoke_args = mock_model_instance.invoke.call_args[0][0]
+    assert isinstance(invoke_args[3], AIMessage)
+    assert "Chain of thought reasoning..." in invoke_args[3].content
+    assert isinstance(invoke_args[4], SystemMessage)
+    assert "Always respond with a tool call" in invoke_args[4].content
+
+    assert (
+        response.intermediate_outputs["chain_of_thought"]
+        == "Chain of thought reasoning..."
+    )
+    assert response.output == "Final response..."
diff --git a/libs/core/kiln_ai/adapters/test_saving_adapter_results.py b/libs/core/kiln_ai/adapters/test_saving_adapter_results.py
index bf8601c..a83c1fe 100644
--- a/libs/core/kiln_ai/adapters/test_saving_adapter_results.py
+++ b/libs/core/kiln_ai/adapters/test_saving_adapter_results.py
@@ -42,7 +42,10 @@ def test_save_run_isolation(test_task):
     adapter = MockAdapter(test_task)
     input_data = "Test input"
     output_data = "Test output"
-    run_output = RunOutput(output=output_data, intermediate_outputs=None)
+    run_output = RunOutput(
+        output=output_data,
+        intermediate_outputs={"chain_of_thought": "Test chain of thought"},
+    )
 
     task_run = adapter.generate_run(
         input=input_data, input_source=None, run_output=run_output
@@ -53,6 +56,9 @@ def test_save_run_isolation(test_task):
     assert task_run.parent == test_task
     assert task_run.input == input_data
     assert task_run.input_source.type == DataSourceType.human
+    assert task_run.intermediate_outputs == {
+        "chain_of_thought": "Test chain of thought"
+    }
     created_by = Config.shared().user_id
     if created_by and created_by != "":
         assert task_run.input_source.properties["created_by"] == created_by