change llm

agent.py

@@ -620,8 +620,8 @@ def solve_text_only_node(state: "AgentState") -> "AgentState":
 
     # LLM (text-only). Swap model as you like.
     # llm = ChatOpenAI(model="gpt-4o-mini", temperature=0)
-    # llm = ChatOpenAI(model="gpt-4o", temperature=0)
-    llm = ChatOpenAI(model="gpt-5-mini", temperature=0)
+    llm = ChatOpenAI(model="gpt-4o", temperature=0)
+    # llm = ChatOpenAI(model="gpt-5-mini", temperature=0)
 
     sys = SystemMessage(content=(
         "You solve GAIA tasks. Use careful step-by-step reasoning but keep it concise.\n"