diff --git a/app.py b/app.py
index 51d4048..b022293 100644
--- a/app.py
+++ b/app.py
@@ -839,7 +839,7 @@ def grade_speaking_task_2():
             token_count = count_total_tokens(messages)
 
             logging.info("POST - speaking_task_2 - " + str(request_id) + " - Requesting grading of the answer.")
-            response = make_openai_call(GPT_3_5_TURBO, messages, token_count, ["comment"],
+            response = make_openai_call(GPT_4_O, messages, token_count, ["comment"],
                                         GRADING_TEMPERATURE)
             logging.info("POST - speaking_task_2 - " + str(request_id) + " - Answer graded: " + str(response))