Anthropic SDK

pip install anthropic

import anthropic

client = anthropic.Anthropic(
    api_key="your_api_key",
    base_url="https://api.modelstack.cc"
)

message = client.messages.create(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Explain quantum computing in simple terms."}
    ]
)

print(message.content[0].text)

with client.messages.stream(
    model="claude-sonnet-4-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a poem about coding."}]
) as stream:
    for text in stream.text_stream:
        print(text, end="")

npm install @anthropic-ai/sdk

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

const client = new Anthropic({
  apiKey: "your_api_key",
  baseURL: "https://api.modelstack.cc",
});

const message = await client.messages.create({
  model: "claude-sonnet-4-5",
  max_tokens: 1024,
  messages: [
    { role: "user", content: "Explain quantum computing in simple terms." },
  ],
});

console.log(message.content[0].text);

const stream = client.messages.stream({
  model: "claude-sonnet-4-5",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Write a poem about coding." }],
});

stream.on("text", (text) => {
  process.stdout.write(text);
});

await stream.finalMessage();