LangChain

from langchain.chat_models import ChatOpenAI
from langchain.schema import HumanMessage

client = ChatOpenAI(
    openai_api_base="https://router.neutrinoapp.com/api/llm-router",
    openai_api_key="<Neutrino-API-key>",
    model_name="your-neutrino-router-id",  # (or 'default')
)

response = client.invoke([HumanMessage(content="What is the capital of France?")])

print(response.content)