Anthropic SDK

pip install anthropic

npm install @anthropic-ai/sdk

import os
from anthropic import Anthropic

client = Anthropic(
    api_key=os.environ["CONCENTRATE_API_KEY"],
    base_url="https://api.concentrate.ai",
)
message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=2048,
    messages=[{"role": "user", "content": "Say hello in one sentence."}],
)
print(message.content[0].text)

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

const client = new Anthropic({
  apiKey: process.env.CONCENTRATE_API_KEY,
  baseURL: "https://api.concentrate.ai",
});
const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 2048,
  messages: [{ role: "user", content: "Say hello in one sentence." }],
});
console.log(message.content[0].text);

with client.messages.stream(
    model="claude-sonnet-4-6",
    max_tokens=2048,
    messages=[{"role": "user", "content": "Tell me a short story."}],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

const stream = client.messages.stream({
  model: "claude-sonnet-4-6",
  max_tokens: 2048,
  messages: [{ role: "user", content: "Tell me a short story." }],
});
stream.on("text", (text) => process.stdout.write(text));
await stream.finalMessage();

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=2048,
    messages=[{"role": "user", "content": "Use get_weather for Paris."}],
    tools=[{
        "name": "get_weather",
        "description": "Get weather for a city",
        "input_schema": {
            "type": "object",
            "properties": {"city": {"type": "string"}},
            "required": ["city"],
        },
    }],
    tool_choice={"type": "tool", "name": "get_weather"},
)
call = next(block for block in message.content if block.type == "tool_use")
print(call.input["city"])

const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 2048,
  messages: [{ role: "user", content: "Use get_weather for Paris." }],
  tools: [{
    name: "get_weather",
    description: "Get weather for a city",
    input_schema: {
      type: "object",
      properties: { city: { type: "string" } },
      required: ["city"],
    },
  }],
  tool_choice: { type: "tool", name: "get_weather" },
});
const call = message.content.find((block) => block.type === "tool_use");
console.log(call.input.city);

import json

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=2048,
    messages=[{"role": "user", "content": "Return JSON with status set to ready."}],
    output_config={"format": {
        "type": "json_schema",
        "schema": {
            "type": "object",
            "properties": {"status": {"type": "string"}},
            "required": ["status"],
            "additionalProperties": False,
        },
    }},
)
text = "".join(block.text for block in message.content if block.type == "text")
print(json.loads(text)["status"])

const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 2048,
  messages: [{ role: "user", content: "Return JSON with status set to ready." }],
  output_config: { format: {
    type: "json_schema",
    schema: {
      type: "object",
      properties: { status: { type: "string" } },
      required: ["status"],
      additionalProperties: false,
    },
  } },
});
const text = message.content
  .filter((block) => block.type === "text")
  .map((block) => block.text)
  .join("");
console.log(JSON.parse(text).status);