GPT-5

GPT-5 is OpenAI's flagship LLM — strong reasoning, tool use, vision, and JSON mode. Drop-in for anything you'd use GPT-4o for.

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.ONEAPIKEY_API_KEY,
  baseURL: "https://oneapikey.app/v1",
});

const res = await client.chat.completions.create({
  model: "gpt-5",
  messages: [{ role: "user", content: "Hello!" }],
});