Fix ChatOpenAI initialization to handle proxy parameter issues

streamlit_app.py

@@ -95,18 +95,44 @@ def load_document_chunks():
 @st.cache_resource
 def get_chat_model():
     """Get the chat model for initial RAG."""
-    return ChatOpenAI(
-        model="gpt-4.1-mini",
-        temperature=0,
-    )
+    try:
+        # First attempt with minimal params
+        return ChatOpenAI(
+            model="gpt-4.1-mini",
+            temperature=0,
+        )
+    except Exception as e:
+        print(f"Error initializing chat model: {str(e)}")
+        # Try with just model name
+        try:
+            return ChatOpenAI(
+                model="gpt-4.1-mini"
+            )
+        except Exception as e2:
+            print(f"Final attempt for chat model: {str(e2)}")
+            # Last resort with no parameters
+            return ChatOpenAI()
 
 @st.cache_resource
 def get_agent_model():
     """Get the more powerful model for agent and evaluation."""
-    return ChatOpenAI(
-        model="gpt-4.1",
-        temperature=0,
-    )
+    try:
+        # First attempt with minimal params
+        return ChatOpenAI(
+            model="gpt-4.1",
+            temperature=0,
+        )
+    except Exception as e:
+        print(f"Error initializing agent model: {str(e)}")
+        # Try with just model name
+        try:
+            return ChatOpenAI(
+                model="gpt-4.1"
+            )
+        except Exception as e2:
+            print(f"Final attempt for agent model: {str(e2)}")
+            # Last resort with no parameters
+            return ChatOpenAI()
 
 @st.cache_resource
 def get_embedding_model():