通过合作伙伴平台使用 Anthropic 的客户端 SDK 需要额外配置。如果您使用 Amazon Bedrock，请参阅此指南；如果您使用 Google Cloud Vertex AI，请参阅此指南。

​
Python

Python 库 GitHub 仓库

示例：

Python
import anthropic

client = anthropic.Anthropic(
    # defaults to os.environ.get("ANTHROPIC_API_KEY")
    api_key="my_api_key",
)
message = client.messages.create(
    model="claude-sonnet-4-20250514",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Hello, Claude"}
    ]
)
print(message.content)

接受的 model 字符串：

# Claude 4 Models
"claude-opus-4-1-20250805"
"claude-opus-4-1"  # alias
"claude-opus-4-20250514"
"claude-opus-4-0"  # alias
"claude-sonnet-4-20250514"
"claude-sonnet-4-0"  # alias

# Claude 3.7 Models
"claude-3-7-sonnet-20250219"
"claude-3-7-sonnet-latest"  # alias

# Claude 3.5 Models
"claude-3-5-haiku-20241022"
"claude-3-5-haiku-latest"  # alias
"claude-3-5-sonnet-20241022"  # deprecated
"claude-3-5-sonnet-latest"  # alias
"claude-3-5-sonnet-20240620"  # deprecated, previous version

# Claude 3 Models
"claude-3-opus-20240229"  # deprecated
"claude-3-opus-latest"  # alias
"claude-3-haiku-20240307"

​
TypeScript

TypeScript 库 GitHub 仓库

虽然这个库是用 TypeScript 编写的，但它也可以在 JavaScript 库中使用。

示例：

TypeScript
import Anthropic from '@anthropic-ai/sdk';

const anthropic = new Anthropic({
  apiKey: 'my_api_key', // defaults to process.env["ANTHROPIC_API_KEY"]
});

const msg = await anthropic.messages.create({
  model: "claude-sonnet-4-20250514",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello, Claude" }],
});
console.log(msg);

接受的 model 字符串：

// Claude 4 Models
"claude-opus-4-1-20250805"
"claude-opus-4-1"  // alias
"claude-opus-4-20250514"
"claude-opus-4-0"  // alias
"claude-sonnet-4-20250514"
"claude-sonnet-4-0"  // alias

// Claude 3.7 Models
"claude-3-7-sonnet-20250219"
"claude-3-7-sonnet-latest"  // alias

// Claude 3.5 Models
"claude-3-5-haiku-20241022"
"claude-3-5-haiku-latest"  // alias
"claude-3-5-sonnet-20241022"  // deprecated
"claude-3-5-sonnet-latest"  // alias
"claude-3-5-sonnet-20240620"  // deprecated, previous version

// Claude 3 Models
"claude-3-opus-20240229"  // deprecated
"claude-3-opus-latest"  // alias
"claude-3-haiku-20240307"

​
Java

Java 库 GitHub 仓库

示例：

Java
import com.anthropic.models.Message;
import com.anthropic.models.MessageCreateParams;
import com.anthropic.models.Model;

MessageCreateParams params = MessageCreateParams.builder()
    .maxTokens(1024L)
    .addUserMessage("Hello, Claude")
    .model(Model.CLAUDE_SONNET_4_0)
    .build();
Message message = client.messages().create(params);

model 枚举值：

// Claude 4 Models
Model.CLAUDE_OPUS_4_1
Model.CLAUDE_OPUS_4_1_20250805
Model.CLAUDE_OPUS_4_0
Model.CLAUDE_OPUS_4_20250514
Model.CLAUDE_SONNET_4_0
Model.CLAUDE_SONNET_4_20250514

// Claude 3.7 Models
Model.CLAUDE_3_7_SONNET_LATEST
Model.CLAUDE_3_7_SONNET_20250219

// Claude 3.5 Models
Model.CLAUDE_3_5_HAIKU_LATEST
Model.CLAUDE_3_5_HAIKU_20241022
Model.CLAUDE_3_5_SONNET_LATEST
Model.CLAUDE_3_5_SONNET_20241022  // deprecated
Model.CLAUDE_3_5_SONNET_20240620  // deprecated

// Claude 3 Models
Model.CLAUDE_3_OPUS_LATEST
Model.CLAUDE_3_OPUS_20240229  // deprecated
Model.CLAUDE_3_HAIKU_20240307

​
Go

Go 库 GitHub 仓库

示例：

Go
package main

import (
	"context"
	"fmt"
	"github.com/anthropics/anthropic-sdk-go/option"

	"github.com/anthropics/anthropic-sdk-go"
)

func main() {
	client := anthropic.NewClient(
		option.WithAPIKey("my-anthropic-api-key"),
	)

	message, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
		Model:     anthropic.ModelClaudeSonnet4_0,
		MaxTokens: 1024,
		Messages: []anthropic.MessageParam{
			anthropic.NewUserMessage(anthropic.NewTextBlock("What is a quaternion?")),
		},
	})
	if err != nil {
		fmt.Printf("Error creating message: %v\n", err)
		return
	}

	fmt.Printf("%+v\n", message.Content)
}

Model 常量：

// Claude 4 Models
anthropic.ModelClaudeOpus4_1
anthropic.ModelClaudeOpus4_1_20250805
anthropic.ModelClaudeOpus4_0
anthropic.ModelClaudeOpus4_20250514
anthropic.ModelClaudeSonnet4_0
anthropic.ModelClaudeSonnet4_20250514

// Claude 3.7 Models
anthropic.ModelClaude3_7SonnetLatest
anthropic.ModelClaude3_7Sonnet20250219

// Claude 3.5 Models
anthropic.ModelClaude3_5HaikuLatest
anthropic.ModelClaude3_5Haiku20241022
anthropic.ModelClaude3_5SonnetLatest
anthropic.ModelClaude3_5Sonnet20241022  // deprecated
anthropic.ModelClaude_3_5_Sonnet_20240620  // deprecated

// Claude 3 Models
anthropic.ModelClaude3OpusLatest
anthropic.ModelClaude_3_Opus_20240229  // deprecated
anthropic.ModelClaude_3_Haiku_20240307

​
Ruby

Ruby 库 GitHub 仓库

示例：

ruby
require "bundler/setup"
require "anthropic"

anthropic = Anthropic::Client.new(
  api_key: "my_api_key" # defaults to ENV["ANTHROPIC_API_KEY"]
)

message =
  anthropic.messages.create(
    max_tokens: 1024,
    messages: [{
      role: "user",
      content: "Hello, Claude"
    }],
    model: "claude-sonnet-4-20250514"
  )

puts(message.content)

接受的 model 字符串：

# Claude 4 Models
:"claude-opus-4-1-20250805"
:"claude-opus-4-1"  # alias
:"claude-opus-4-20250514"
:"claude-opus-4-0"  # alias
:"claude-sonnet-4-20250514"
:"claude-sonnet-4-0"  # alias

# Claude 3.7 Models
:"claude-3-7-sonnet-20250219"
:"claude-3-7-sonnet-latest"  # alias

# Claude 3.5 Models
:"claude-3-5-haiku-20241022"
:"claude-3-5-haiku-latest"  # alias
:"claude-3-5-sonnet-20241022"  # deprecated
:"claude-3-5-sonnet-latest"  # alias
:"claude-3-5-sonnet-20240620"  # deprecated, previous version

# Claude 3 Models
:"claude-3-opus-20240229"  # deprecated
:"claude-3-opus-latest"  # alias
:"claude-3-haiku-20240307"

​
PHP

PHP 库 GitHub 仓库

PHP SDK 目前处于测试版。

示例：

PHP
<?php

use Anthropic\Client;
use Anthropic\Messages\MessageParam;

$client = new Client(
  apiKey: getenv("ANTHROPIC_API_KEY") ?: "my-anthropic-api-key"
);

$message = $client->messages->create(
  maxTokens: 1024,
  messages: [MessageParam::with(role: "user", content: "Hello, Claude")],
  model: "claude-sonnet-4-20250514",
);
var_dump($message->content);

接受的 model 字符串：

// Claude 4 Models
"claude-opus-4-1-20250805"
"claude-opus-4-1"  // alias
"claude-opus-4-20250514"
"claude-opus-4-0"  // alias
"claude-sonnet-4-20250514"
"claude-sonnet-4-0"  // alias

// Claude 3.7 Models
"claude-3-7-sonnet-20250219"
"claude-3-7-sonnet-latest"  // alias

// Claude 3.5 Models
"claude-3-5-haiku-20241022"
"claude-3-5-haiku-latest"  // alias
"claude-3-5-sonnet-20241022"  // deprecated
"claude-3-5-sonnet-latest"  // alias
"claude-3-5-sonnet-20240620"  // deprecated, previous version

// Claude 3 Models
"claude-3-opus-20240229"  // deprecated
"claude-3-opus-latest"  // alias
"claude-3-haiku-20240307"

Model 常量：

// Claude 4 Models
Model::CLAUDE_OPUS_4_1_20250805
Model::CLAUDE_OPUS_4_0  // alias
Model::CLAUDE_OPUS_4_20250514
Model::CLAUDE_SONNET_4_20250514
Model::CLAUDE_SONNET_4_0  // alias

// Claude 3.7 Models
Model::CLAUDE_3_7_SONNET_LATEST  // alias
Model::CLAUDE_3_7_SONNET_20250219

// Claude 3.5 Models
Model::CLAUDE_3_5_HAIKU_LATEST  // alias
Model::CLAUDE_3_5_HAIKU_20241022
Model::CLAUDE_3_5_SONNET_LATEST  // alias
Model::CLAUDE_3_5_SONNET_20241022  // deprecated
Model::CLAUDE_3_5_SONNET_20240620  // deprecated, previous version

// Claude 3 Models
Model::CLAUDE_3_OPUS_LATEST  // alias
Model::CLAUDE_3_OPUS_20240229  // deprecated
Model::CLAUDE_3_HAIKU_20240307

​
客户端 SDK 中的 Beta 命名空间

每个 SDK 都有一个可用的 beta 命名空间。这用于 Anthropic 以测试版发布的新功能。将其与测试版标头结合使用来使用这些功能。

import anthropic

client = anthropic.Anthropic(
    # defaults to os.environ.get("ANTHROPIC_API_KEY")
    api_key="my_api_key",
)
message = client.beta.messages.create(
    model="claude-sonnet-4-20250514",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Hello, Claude"}
    ],
    betas=["beta-feature-name"]
)
print(message.content)