How can I pass conversation id when invoking OpenAi's Responses API with langchain?

LangSmith Product Help
1

So if you see this using conversations api section here in this link of open ai docs. https://platform.openai.com/docs/guides/conversation-state#using-the-conversations-api

When we are calling the Responses api we can now pass a conversation id to maintain the context. I want to do the same using langchain while invoking as well is there a way to do so ?

Does langchain’s responses api support passing conversation id or not?

2

Hi @saumya66

have you tried this? I assume you are asking for python and v1 :slight_smile:

When using LangChain’s OpenAI Responses API integration, you can link turns via OpenAI’s conversation state features. In LangChain you do this by either:

  • Passing a previous response’s ID using previous_response_id, or

  • Passing an OpenAI conversation reference via the conversation field (mutually exclusive with previous_response_id).

How to do it in LangChain (Python)

Using previous_response_id (manual):


from langchain_openai import ChatOpenAI

llm = ChatOpenAI(model="gpt-4.1-mini", use_responses_api=True)

first = llm.invoke("Hi, I'm Bob.")

prev_id = first.response_metadata["id"] # OpenAI response id

second = llm.invoke("What is my name?", previous_response_id=prev_id)

print(second.text)

Using automatic chaining:


from langchain_openai import ChatOpenAI

llm = ChatOpenAI(model="gpt-4.1-mini", use_previous_response_id=True)

llm.invoke("Hi, I'm Bob.")

print(llm.invoke("What is my name?").text)
3

thanks for reply @pawel-twardziak , i get the passing of previous_response_id but how to pass conversation id, did not find this in langchain docs.

4

Hi @saumya66

then try this

conversation = openai.conversations.create()

llm = ChatOpenAI(
    model="gpt-4.1-mini",
    use_responses_api=True,
    model_kwargs={"conversation": conversation.id},
)
5

sure thx

6

Hi Pawel,
automatic chain as in it will automatically pass the previous response id acrosss the graph or agents ?
suppose I have multi agents builts using create_agent from langchain I have developed supervisor pattern will it take the previous response id on its own ? I don’t need to pass it