Update models.py

models.py

@@ -61,7 +61,7 @@ class OpenAIModel(BaseTCOModel):
             if model == "GPT-4":
                 return gr.Dropdown.update(choices=["8K", "32K"])
             else:
-                return gr.Dropdown.update(choices=["4K", "16K"])
+                return gr.Dropdown.update(choices=["4K", "16K"], value="4K")
 
         self.model = gr.Dropdown(["GPT-4", "GPT-3.5 Turbo"], value="GPT-4",
                                  label="OpenAI models",