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 = []

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

with st.sidebar:
    openai_api_key = st.text_input("OpenAI API Key", type="password")
    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=8000,
                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})