Update app.py

app.py

@@ -20,12 +20,12 @@ print(f"api key is {api_key}")
 @cl.on_chat_start
 async def start_llm():
     print("Initializing llm...")
-    #llm = ChatOpenAI(model='gpt-4o-mini',
-    #             temperature=0.5, api_key = api_key)
-    model_id = "mistralai/Mixtral-8x7B-Instruct-v0.1"
-    llm = HuggingFaceEndpoint(
-        repo_id=model_id, max_length=2000, temperature=0.5, token=os.getenv('HF_READ_TOKEN')
-    )
+    llm = ChatOpenAI(model='gpt-4o-mini',
+                 temperature=0.5, api_key = api_key)
+    #model_id = "mistralai/Mixtral-8x7B-Instruct-v0.1"
+    #llm = HuggingFaceEndpoint(
+    #    repo_id=model_id, max_length=2000, temperature=0.5, token=os.getenv('HF_READ_TOKEN')
+    #)
     print("llm initialized!")
     conversation_memory = ConversationBufferMemory(memory_key="chat_history",
                                                    max_len=50,