Update app.py

app.py

@@ -21,7 +21,7 @@ os.environ["OPENAI_API_KEY"] = os.getenv("OPENAI_API_KEY")
 EMBED_DIMENSION = 512
 llama_llm = OpenAI(model="gpt-3.5-turbo")
 llama_embedding_model = OpenAIEmbedding(model="text-embedding-3-small", dimensions=EMBED_DIMENSION)
-langchain_llm = ChatOpenAI(model="gpt-3.5-turbo")
+langchain_llm = ChatOpenAI(model="gpt-4o")
 
 # Streamlit app
 st.title("Streamlit App with LangChain and LlamaIndex")