Chat models | 🦜️🔗 LangChain (original) (raw)

Chat models are language models that use a sequence of messages as inputs and return messages as outputs (as opposed to using plain text). These are generally newer models.

pip install -qU "langchain[openai]"

import getpass
import os

if not os.environ.get("OPENAI_API_KEY"):
  os.environ["OPENAI_API_KEY"] = getpass.getpass("Enter API key for OpenAI: ")

from langchain.chat_models import init_chat_model

model = init_chat_model("gpt-4o-mini", model_provider="openai")

model.invoke("Hello, world!")

Featured Providers​

info

While all these LangChain classes support the indicated advanced feature, you may have to open the provider-specific documentation to learn which hosted models or backends support the feature.

All chat models​