SDKs & agents

SDKs & agents

Anything that speaks the OpenAI chat-completions API works unchanged. Point the base URL at https://atmorouter.dev/v1 and use your ar- key.

Python

python
pip install openai

from openai import OpenAI
client = OpenAI(base_url="https://atmorouter.dev/v1", api_key="ar-xxxxxxxxxxxx")

Node.js

javascript
npm install openai

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://atmorouter.dev/v1",
  apiKey: process.env.ATMOROUTER_API_KEY,
});

const res = await client.chat.completions.create({
  model: "cbcn/glm-5.3",
  messages: [{ role: "user", content: "Explain PKCE." }],
});

Environment variables

Most tools read the standard OpenAI variables, so exporting these two is often the whole integration:

bash
export OPENAI_BASE_URL="https://atmorouter.dev/v1"
export OPENAI_API_KEY="ar-xxxxxxxxxxxx"

Frameworks

ToolHow to point it here
LangChainPass base_url and api_key to ChatOpenAI.
LlamaIndexSame two arguments on the OpenAI LLM class.
LiteLLMUse the openai/ provider prefix with api_base set.
Coding agentsAnything reading OPENAI_BASE_URL works. Set the two variables above.

Anthropic SDK

The Anthropic Messages API is supported natively. Note the base URL has no /v1 suffix, because the Anthropic SDK appends it itself. Any model in the catalogue can be called this way, not only Claude.

python
from anthropic import Anthropic

client = Anthropic(
    base_url="https://atmorouter.dev",
    api_key="ar-xxxxxxxxxxxx",
)

msg = client.messages.create(
    model="cb/claude-opus-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a haiku."}],
)
print(msg.content[0].text)
bash
curl https://atmorouter.dev/v1/messages \
  -H "x-api-key: ar-xxxxxxxxxxxx" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "cb/claude-opus-5",
    "max_tokens": 1024,
    "messages": [{"role": "user", "content": "Hello"}]
  }'
Errors on this surface use the Anthropic error envelope ({"type":"error","error":{...}}), so Anthropic SDKs parse them correctly. Streaming follows the Anthropic event protocol (message_start, content_block_delta, message_delta).
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