fixed tool

tools.py

@@ -38,13 +38,13 @@ class AnswerTool(Tool):
     output_type = "string"
 
     def forward(self, question: str) -> str:
-        # Build chat messages
         messages = [
             {"role": "system", "content": SYSTEM_PROMPT},
             {"role": "user",   "content": question},
         ]
+        # → qui usiamo la nuova API v1
         resp = openai.chat.completions.create(
-            model="gpt-4",
+            model="gpt-4o",
             messages=messages,
             temperature=0.0,
             max_tokens=64,
@@ -52,5 +52,4 @@ class AnswerTool(Tool):
         text = resp.choices[0].message.content.strip()
         if "FINAL ANSWER:" in text:
             return text.split("FINAL ANSWER:")[-1].strip()
-        return text
-
+        return text