LangChain

pip install langchain langchain-openai

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(
    model="claude-opus-4-8",                  # exact name on the pricing page
    api_key="sk-YOUR_KEY",
    base_url="https://www.ruapi.ai/v1",  # with /v1
)

print(llm.invoke("Hi! Answer in one sentence.").content)

npm install @langchain/openai @langchain/core

import { ChatOpenAI } from "@langchain/openai";

const llm = new ChatOpenAI({
  model: "claude-opus-4-8",
  apiKey: "sk-YOUR_KEY",
  configuration: { baseURL: "https://www.ruapi.ai/v1" },
});

const res = await llm.invoke("Hi! Answer in one sentence.");
console.log(res.content);

from langchain_openai import OpenAIEmbeddings

embeddings = OpenAIEmbeddings(
    model="text-embedding-3-small",       # or another embedding model from the catalog
    api_key="sk-YOUR_KEY",
    base_url="https://www.ruapi.ai/v1",
)