questions/Python

Claude Sonnet 4.6 Python example?

Here's a minimal Python example calling Claude Sonnet 4.6 through AIgateway's OpenAI-compatible API. Install `pip install aigateway-py openai`, create an sk-aig-... key at aigateway.sh, then instantiate the OpenAI client with base_url="https://api.aigateway.sh/v1" and call chat.completions.create with model="anthropic/claude-sonnet-4.6". Works with streaming, tool calling, vision, and async out of the box.

How it works

1. Install the SDKs

pip install aigateway-py openai. The OpenAI SDK handles chat, embeddings, images, and audio endpoints — which covers Claude Sonnet 4.6 end-to-end. aigateway-py adds gateway-specific primitives: sub-account key minting, evals, replays, async jobs, and webhook signature verification.

2. Construct the client once, call the right endpoint

Use client.chat.completions.create with model="anthropic/claude-sonnet-4.6". AIgateway matches OpenAI's request and response shape exactly, so autocompletion, type hints, and error handling all work.

3. Stream, batch, or tool-call — same API

Set stream=True for server-sent events. Pass tools=[...] for function calling, include image URLs directly in the messages array. The OpenAI SDK's helpers (with_raw_response, with_streaming_response, runnable tools) all work against AIgateway unchanged because the wire format is identical.

Code example

Python
# pip install aigateway-py openai
# aigateway-py: sub-accounts, evals, replays, jobs, webhook verify.
# openai SDK: chat/embeddings/images/audio — drop-in compat per our SDK's own guidance.
from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

r = client.chat.completions.create(
    model="anthropic/claude-sonnet-4.6",
    messages=[{"role": "user", "content": "Explain vector databases in two sentences."}],
)
print(r.choices[0].message.content)
Node / TypeScript
// npm i aigateway-js openai
// aigateway-js: sub-accounts, evals, replays, jobs, webhook verify.
// openai SDK: chat/embeddings/images/audio — drop-in compat.
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.aigateway.sh/v1",
  apiKey: process.env.AIGATEWAY_KEY,
});

const r = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-4.6",
  messages: [{ role: "user", content: "Explain vector databases in two sentences." }],
});
console.log(r.choices[0].message.content);

Related

FAQ

What Python SDK should I use with Claude Sonnet 4.6?

The official OpenAI Python SDK (openai package) works unchanged. Pair with aigateway-py for sub-account key minting, evals, replays, and webhook signature verification.

How do I stream Claude Sonnet 4.6 responses in Python?

Pass stream=True to chat.completions.create and iterate: for chunk in stream: print(chunk.choices[0].delta.content, end=""). Works identically to OpenAI.

Can I use async Python with Claude Sonnet 4.6?

Yes — import AsyncOpenAI from openai, await client.chat.completions.create(...). AIgateway supports concurrent connections and HTTP/2.

Does Claude Sonnet 4.6 work with LangChain and LlamaIndex?

Yes. Use ChatOpenAI(base_url="https://api.aigateway.sh/v1", api_key="sk-aig-...", model="anthropic/claude-sonnet-4.6"). LlamaIndex: OpenAI(api_base="https://api.aigateway.sh/v1", api_key="sk-aig-...", model="anthropic/claude-sonnet-4.6").

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