diff --git a/tradingagents/llm_clients/copilot_client.py b/tradingagents/llm_clients/copilot_client.py
index 3d2eb0c5..d91aa21d 100644
--- a/tradingagents/llm_clients/copilot_client.py
+++ b/tradingagents/llm_clients/copilot_client.py
@@ -33,7 +33,7 @@ _RESPONSES_ONLY_MODELS = frozenset((
 
 _PASSTHROUGH_KWARGS = (
     "timeout", "max_retries", "reasoning_effort",
-    "api_key", "callbacks", "http_client", "http_async_client",
+    "callbacks", "http_client", "http_async_client",
 )