Anthropic - AgentScope Java

agentscope-extensions-model-anthropic integrates Anthropic Claude models, including Anthropic-specific formatter and request DTO support.

Add the dependency

<dependency>
    <groupId>io.agentscope</groupId>
    <artifactId>agentscope-extensions-model-anthropic</artifactId>
    <version>${agentscope.version}</version>
</dependency>

ModelRegistry

Set ANTHROPIC_API_KEY, then use the anthropic:<model> id:

ReActAgent agent = ReActAgent.builder()
    .name("assistant")
    .model("anthropic:claude-sonnet-4.5") // Resolved internally by ModelRegistry.resolve(modelId)
    .build();

Explicit builder

Use the builder when you need a custom endpoint, formatter, transport, prompt caching, thinking, or generation options:

import io.agentscope.extensions.model.anthropic.AnthropicChatModel;

AnthropicChatModel model = AnthropicChatModel.builder()
    .apiKey(System.getenv("ANTHROPIC_API_KEY"))
    .modelName("claude-sonnet-4.5")
    .stream(true)
    .build();

Spring Boot

Spring Boot applications can use the Anthropic starter:

<dependency>
    <groupId>io.agentscope</groupId>
    <artifactId>agentscope-anthropic-spring-boot-starter</artifactId>
    <version>${agentscope.version}</version>
</dependency>

Full builder options, formatters, credentials, and registry context details are covered in Model.