LangChain

from langchain_openai import ChatOpenAI

llm = ChatOpenAI(
    model="vichar-sonnet-5.5",
    api_key="vichar_...",
    base_url="https://api.vichar.io/v1",
)
print(llm.invoke("Hello").content)

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

const llm = new ChatOpenAI({
	model: "vichar-sonnet-5.5",
	apiKey: process.env.VICHAR_API_KEY,
	configuration: { baseURL: "https://api.vichar.io/v1" },
});
const res = await llm.invoke("Hello");
console.log(res.content);