Updated model

utils/chatbot_interface.py

@@ -8,7 +8,7 @@ from utils.response_manager import ResponseManager
 
 class ChatbotInterface:
     def __init__(self, 
-                 model: str = "gpt-4o-mini",
+                 model: str = "gpt-4.1-nano",
                  temperature: float = 0,
                  max_output_tokens: int = 600,
                  max_num_results: int = 5,