diff --git a/neuron-explainer/neuron_explainer/explanations/simulator.py b/neuron-explainer/neuron_explainer/explanations/simulator.py
index 4111ead..3bb21f0 100644
--- a/neuron-explainer/neuron_explainer/explanations/simulator.py
+++ b/neuron-explainer/neuron_explainer/explanations/simulator.py
@@ -718,7 +718,7 @@ async def simulate(
             self.explanation,
         )
         response = await self.api_client.make_request(
-            prompt=prompt, echo=False, max_tokens=1000
+            messages=prompt, max_tokens=1000
         )
         assert len(response["choices"]) == 1