Update app.py

app.py

@@ -13,8 +13,7 @@ import os
 
 class SpyAgent(BasicAgent):
 
-    def set_model_name():
-        return super().set_model_name()
+    self.model_name = 'gpt-4o-mini'
 
     def perceive(self, req=AgentReq):
         logger.info("spy perceive: {}".format(req))