diff --git a/talk.py b/talk.py
index bac84f5..93b9152 100644
--- a/talk.py
+++ b/talk.py
@@ -1,3 +1,4 @@
+import random
 import sys
 from datetime import datetime
 
@@ -237,7 +238,7 @@ class Talk:
 
         try:
             return openai.chat.completions.create (
-                    model = 'gpt-3.5-turbo',
+                    model = 'gpt-4o' if random.random () < .2 else 'gpt-3.5-turbo',
                     messages = messages).choices[0].message
         except:
             return None