remove "/chat/completions" from POST URL

[fanofyes]

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Example Code

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Description

I'm using the ChatOpenAI API. My company got us to redirect all openai requests to a new URL and I'm now getting 403 errors. I narrowed it down to the URL in the request not accepting "/chat/completions" that's tacked on by the Langchain framework. Is there anything I can do? Can I set one parameter (which I can't find) so that '/chat/completions' is not tacked on?

llm = ChatOpenAI(model_name = 'gpt-4o-mini', temperature=0, openai_api_base= os.getenv("OPENAI_API_BASE"), api_key = os.getenv("OPENAI_API_KEY"), http_client=http_client, http_async_client=http_async_client)

this works 'manually'
Request: POST https://company_url.com/xyz

with the /chat/completions' that's tacked on by the framework, but now I'm getting 403 errors
Request: POST https://company_url.com/xyz/chat/completions

System Info

langchain==0.3.25
langchain-community==0.3.24
langchain-core==0.3.64
langchain-openai==0.3.21
langchain-text-splitters==0.3.8