upadte app.py : gpt-4 model instead of 3.5

app.py

@@ -4,7 +4,7 @@ import sys
 import json 
 import requests
 
-MODEL = "gpt-3.5-turbo"
+MODEL = "gpt-4"
 API_URL = os.getenv("API_URL")
 DISABLED = os.getenv("DISABLED") == 'True'
 OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
@@ -119,7 +119,7 @@ def predict(inputs, top_p, temperature, chat_counter, chatbot, history, request:
 def reset_textbox():
     return gr.update(value='', interactive=False), gr.update(interactive=False)
 
-title = """<h1 align="center">Chat GPT online</h1>"""
+title = """<h1 align="center">Chat GPT 4 online</h1>"""
 if DISABLED:
     title = """<h1 align="center" style="color:red">This app has reached OpenAI's usage limit. We are currently requesting an increase in our quota. Please check back in a few days.</h1>"""
 description = """Language models can be conditioned to act like dialogue agents through a conversational prompt that typically takes the form:
@@ -139,7 +139,7 @@ with gr.Blocks(css = """#col_container { margin-left: auto; margin-right: auto;}
                 #chatbot {height: 520px; overflow: auto;}""",
               theme=theme) as demo:
     gr.HTML(title)
-    gr.HTML("""<h3 align="center">This app provides you full access to GPT-3.5 (4096 token limit) thanks to <a href="https://stablediffusion.fr">stablediffusion.fr</a>. You don't need any OPENAI API key.</h3>""")
+    gr.HTML("""<h3 align="center">This app provides you full access to Chat GPT-4 (4096 token limit) thanks to <a href="https://stablediffusion.fr">stablediffusion.fr</a>. You don't need any OPENAI API key.</h3><h4>If this app doesn't respond, it's likely due to too visitors on this page. Consider trying our <a href="https://stablediffusion.fr">Chat GPT-3.5</a> app.</h4>""")
     with gr.Column(elem_id = "col_container", visible=False) as main_block:
         #openai_api_key = gr.Textbox(type='password', label="Enter only your OpenAI API key here")
         chatbot = gr.Chatbot(elem_id='chatbot') #c