String-in, string-out llms

tip

You are probably looking for the Chat Model Concept Guide page for more information.

LangChain has implementations for older language models that take a string as input and return a string as output. These models are typically named without the "Chat" prefix (e.g., Ollama, Anthropic, OpenAI, etc.), and may include the "LLM" suffix (e.g., OpenAILLM, etc.). These models implement the BaseLLM interface.

Users should be using almost exclusively the newer Chat Models as most model providers have adopted a chat like interface for interacting with language models.