interface OpenAIDecisionsFieldsFalls back to the LangSmith gateway key when routing through the gateway, then
to the OPENAI_API_KEY environment variable.
OpenAI SDK client options, such as baseURL, timeout or fetch. Without a
baseURL, OPENAI_API_BASE or OPENAI_BASE_URL, setting LANGSMITH_GATEWAY
routes requests through the LangSmith gateway, as with ChatOpenAI.
Decisions model name, such as gpt-6-luna.