Update app.py

app.py

@@ -8,7 +8,7 @@ OPENAI_API_KEY = os.getenv('OPENAI_API_KEY')
 if not OPENAI_API_KEY:
     raise ValueError("API key not found. Please set the OPENAI_API_KEY environment variable.")
 
-openai.api_key = OPENAI_API_KEY
+client = OpenAI(api_key=OPENAI_API_KEY)
 
 global_system_prompt = None
 global_model = 'gpt-4'
@@ -57,7 +57,7 @@ def convert_history_to_openai_format(history):
 
 def bot(history):
     global global_model
-    response = openai.ChatCompletion.create(
+    response = client.chat.completions.create(
         model=global_model,
         messages=convert_history_to_openai_format(history)
     )