Good to know All examples use the same endpoint. To switch models, change only the "model" value — no other code changes required.

The fastest way to test your key from any terminal.

cURL

curl https://clauden.ai/v1/chat/completions \
  -H "Authorization: Bearer $CLAUDEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Use the official OpenAI SDK — just point base_url at ClaudeN AI.

OpenAI Python SDK

from openai import OpenAI

client = OpenAI(
    api_key="$CLAUDEN_API_KEY",
    base_url="https://clauden.ai/v1",
)

resp = client.chat.completions.create(
    model="gpt-5.4",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)

Prefer the Anthropic SDK? Use the /v1/anthropic base URL.

Anthropic Python SDK

from anthropic import Anthropic

client = Anthropic(
    api_key="$CLAUDEN_API_KEY",
    base_url="https://clauden.ai/v1/anthropic",
)

msg = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}],
)
print(msg.content[0].text)

Node.js with the official OpenAI SDK — only baseURL and apiKey change.

OpenAI Node.js SDK

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.CLAUDEN_API_KEY,
  baseURL: "https://clauden.ai/v1",
});

const resp = await client.chat.completions.create({
  model: "gpt-5.4",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(resp.choices[0].message.content);

Streaming works the same way as with OpenAI: pass stream=True and iterate the chunks.

Python streaming

stream = client.chat.completions.create(
    model="claude-sonnet-4-6",
    messages=[{"role": "user", "content": "Hello!"}],
    stream=True,
)
for chunk in stream:
    delta = chunk.choices[0].delta.content
    if delta:
        print(delta, end="", flush=True)

Editors & agent frameworks

Cursor: Settings → Models → check "Override OpenAI Base URL", set it to the base URL below, paste your ClaudeN API key, then add model names such as claude-sonnet-4-6 or gpt-5.4 to the model list.

Cline / Continue: choose the "OpenAI Compatible" provider, set the same base URL and API key, and pick any enabled model name. LangChain and LlamaIndex work through their standard OpenAI classes with a custom base_url.

Base URL https://clauden.ai/v1

Replace $CLAUDEN_API_KEY with your own API key (it starts with sk-). It is sent in the Authorization header.

Get your API key Quick Start →

Integration examples