LangChain

Install the LangChain OpenAI integration:

python -m pip install langchain-openai

Set OPENAI_API_KEY and OPENAI_BASE_URL as shown in LLM SDKs. Then run this Python code:

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(model="claude-sonnet")
print(llm.invoke("In one sentence, explain what an AI model is.").content)

The code prints the response of the model. To use a different model, change the model value.