OpenAI API Reference: Chat Completions, OpenAI, 2024 (OpenAI) - Details the native OpenAI API for creating chat completions, providing context for LangChain's ChatOpenAI integration.
Hugging Face Inference API Documentation, Hugging Face, 2024 (Hugging Face) - Outlines the Hugging Face Inference API for hosted models, which LangChain's HuggingFaceHub class utilizes for integration.