What is the correct way to use async httpx client with langchain for OpenAI?

Question

While trying to invoke Langchain runnables asynchronously using ainvoke(), facing Attribute Error.

Following the snippet

llm = OpenAI(model_name="gpt-3.5-turbo-instruct", async_client=httpx.AsyncClient(verify=False))
prompt = PromptTemplate(
    input_variables=["text"],
    template=template,
)

runnable= prompt | llm

result = await runnable.ainvoke({"text": text})

Facing this error Attribute Error: AsyncClient doesn't contain the method create()