Update tools.py

tools.py

@@ -43,8 +43,8 @@ class AnswerTool(Tool):
             {"role": "system", "content": SYSTEM_PROMPT},
             {"role": "user",   "content": question},
         ]
-        resp = openai.ChatCompletion.create(
-            model="gpt-3.5-turbo",  # o "gpt-4" se hai ancora quota
+        resp = openai.chat.completions.create(
+            model="gpt-4",
             messages=messages,
             temperature=0.0,
             max_tokens=64,