Node.js / TypeScript: official OpenAI or Anthropic SDK

Set baseURL and your key — the rest of your code stays the same.

1. OpenAI SDK — chat

npm install openai

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://YOUR-ENDPOINT/v1",
  apiKey: process.env.YOUR_KEY,
});

const resp = await client.chat.completions.create({
  model: "anthropic/claude-haiku-5.5",
  messages: [{ role: "user", content: "Say hi in 3 words." }],
  max_tokens: 200,
});
console.log(resp.choices[0].message.content);

2. Streaming

const stream = await client.chat.completions.create({
  model: "anthropic/claude-haiku-5.5",
  messages: [{ role: "user", content: "Count from 1 to 5." }],
  max_tokens: 200,
  stream: true,
});
for await (const chunk of stream) {
  process.stdout.write(chunk.choices[0]?.delta?.content ?? "");
}

3. Anthropic SDK

npm install @anthropic-ai/sdk

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "https://YOUR-ENDPOINT",
  apiKey: process.env.YOUR_KEY,
});

const msg = await client.messages.create({
  model: "anthropic/claude-haiku-5.5",
  max_tokens: 200,
  messages: [{ role: "user", content: "Say hi in 3 words." }],
});
console.log(msg.content[0].text);

FAQ