Official SDK Ecosystem

Anthropic provides first-party SDKs for four languages: Python, TypeScript, Go, and Java. These SDKs wrap the raw REST API with idiomatic helpers, type safety, automatic retries, and streaming utilities — dramatically reducing boilerplate and improving reliability in production.

Python SDK

The Python SDK (anthropic) is the most mature and widely used. It provides synchronous and async clients, streaming helpers, and full type annotations.

# Installation
pip install anthropic

# Basic usage
import anthropic

client = anthropic.Anthropic()  # Uses ANTHROPIC_API_KEY env var

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

# Streaming
with client.messages.stream(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a poem."}]
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

TypeScript SDK

The TypeScript SDK (@anthropic-ai/sdk) provides full type safety, streaming iterators, and works in both Node.js and edge runtimes (Deno, Bun, Cloudflare Workers).

// Installation
// npm install @anthropic-ai/sdk

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

const client = new Anthropic();  // Uses ANTHROPIC_API_KEY env var

const message = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello, Claude!" }]
});
console.log(message.content[0].text);

// Streaming
const stream = client.messages.stream({
  model: "claude-sonnet-4-6",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Write a haiku." }]
});
for await (const event of stream) {
  if (event.type === "content_block_delta") {
    process.stdout.write(event.delta.text);
  }
}

Go & Java SDKs

Anthropic also offers official SDKs for Go (github.com/anthropics/anthropic-sdk-go) and Java (com.anthropic:anthropic-java). Both provide idiomatic interfaces, streaming support, and automatic retries.

Common SDK Features