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0831e445cf
Documents the env vars that influence `base_url` resolution on `ChatOpenAI`, `OpenAIEmbeddings`, and `BaseOpenAI`. The previous docstrings only said "leave blank if not using a proxy or service emulator" and did not explain that two different env vars are consulted by two different layers. Concretely: - `OPENAI_API_BASE` is read explicitly by LangChain at init and passed as `base_url` to the underlying client. - `OPENAI_BASE_URL` is read by the underlying `openai` SDK client itself. LangChain only inspects its presence to decide whether to default-enable `stream_usage` (left off when set, because many non-OpenAI endpoints do not support streaming token usage). Precedence: explicit `base_url=` kwarg → `OPENAI_API_BASE` → `OPENAI_BASE_URL` (via SDK fallback). Docs-only change — no behavior change. > AI-agent involvement: drafted by an AI agent and reviewed before submission. _Opened collaboratively by Mason Daugherty and open-swe._ Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com> Co-authored-by: Mason Daugherty <61371264+mdrxy@users.noreply.github.com>
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