app.py

import openai
import streamlit as st

st.title("ChatGPT-Clone")
    
if "openai_model" not in st.session_state:
    st.session_state["openai_model"] = "gpt-3.5-turbo-16k"


# if "messages" not in st.session_state:
#     st.session_state.messages = []

if "messages" not in st.session_state or st.sidebar.button("Clear message history"):
    st.session_state["messages"] = [{"role": "assistant", "content": "How can I help you?"}]

for message in st.session_state.messages:
    with st.chat_message(message["role"]):
        st.markdown(message["content"])

openai.api_key = st.sidebar.text_input("OpenAI API Key", type="password")

if "openai.api_key" not in st.session_state:
    st.session_state["openai.api_key"] = openai.api_key
    
if not openai.api_key:
    st.info("Please add your OpenAI API key to continue.")
    st.stop()
    
if prompt := st.chat_input("What is up?"):
    st.session_state.messages.append({"role": "user", "content": prompt})
    with st.chat_message("user"):
        st.markdown(prompt)

    with st.chat_message("assistant"):
        message_placeholder = st.empty()
        full_response = ""
        for response in openai.ChatCompletion.create(
            model=st.session_state["openai_model"],
            messages=[
                {"role": m["role"], "content": m["content"]}
                for m in st.session_state.messages
            ],
            max_tokens=9000,
            stream=True,
        ):
            full_response += response.choices[0].delta.get("content", "")
            message_placeholder.markdown(full_response + "▌")
        message_placeholder.markdown(full_response)
    st.session_state.messages.append({"role": "assistant", "content": full_response})