Claude SDK for Java

The Claude SDK for Java provides access to the Claude API from Java applications.

Documentation

Full documentation is available at platform.claude.com/docs/en/api/sdks/java.

Installation

Gradle

implementation("com.anthropic:anthropic-java:2.27.0")

Maven

<dependency>
  <groupId>com.anthropic</groupId>
  <artifactId>anthropic-java</artifactId>
  <version>2.27.0</version>
</dependency>

Getting started

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.models.messages.Message;
import com.anthropic.models.messages.MessageCreateParams;
import com.anthropic.models.messages.Model;

// Configures using the `ANTHROPIC_API_KEY` environment variable
AnthropicClient client = AnthropicOkHttpClient.fromEnv();

MessageCreateParams params = MessageCreateParams.builder()
    .maxTokens(1024L)
    .addUserMessage("Hello, Claude")
    .model(Model.CLAUDE_OPUS_4_6)
    .build();
Message message = client.messages().create(params);

Requirements

Java 8+

Contributing

See CONTRIBUTING.md.

License

This project is licensed under the MIT License. See the LICENSE file for details.