Update app.py

app.py

@@ -198,7 +198,9 @@ def chat_with_model(prompt, document_section, model_choice='gpt-3.5-turbo'):
     res_box = st.empty()
     collected_chunks = []
     collected_messages = []
-
+    
+    key = os.getenv('OPENAI_KEY')
+    openai.api_key = key
     for chunk in openai.ChatCompletion.create(
         model='gpt-3.5-turbo',
         messages=conversation,