인증

client = Anthropic(api_key="my-anthropic-api-key")
# or, with ANTHROPIC_API_KEY set in the environment:
client = Anthropic()

const client = new Anthropic({ apiKey: "my-anth...key" });
// or, with ANTHROPIC_API_KEY set in the environment:
// const client = new Anthropic();

client := anthropic.NewClient(
	option.WithAPIKey("sk-ant-..."), // defaults to os.LookupEnv("ANTHROPIC_API_KEY")
)

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;

// Explicit
AnthropicClient client = AnthropicOkHttpClient.builder()
  .apiKey("my-anthropic-api-key")
  .build();

// From ANTHROPIC_API_KEY (or anthropic.apiKey system property)
AnthropicClient clientFromEnv = AnthropicOkHttpClient.fromEnv();

using Anthropic;

AnthropicClient client = new() { ApiKey = "my-anthropic-api-key" };
// Or, with ANTHROPIC_API_KEY set in the environment:
// AnthropicClient client = new();

// Reads ANTHROPIC_API_KEY from the environment
$client = new Client();
// Or pass the key explicitly:
$client = new Client(apiKey: 'my-anth...');

anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key")
# or, with ANTHROPIC_API_KEY set in the environment:
anthropic = Anthropic::Client.new

# See /docs/en/cli-sdks-libraries/cli/authentication#api-key for zsh, bash, and Windows variants
export ANTHROPIC_API_KEY=sk-ant-...

# Required on every command for a multi-workspace key.
# Omit --workspace-id for a single-workspace key.
ant messages create \
  --workspace-id wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ \
  --model claude-opus-5-5 \
  --max-tokens 1024 \
  --message '{role: user, content: "Hello, Claude"}'

client = Anthropic()  # reads ANTHROPIC_API_KEY

# Required on every request for a multi-workspace key.
# Omit extra_headers for a single-workspace key.
message = client.messages.create(
    model="claude-opus-5-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello, Claude"}],
    extra_headers={"anthropic-workspace-id": "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ"},
)
print(message.content)

# Or set it once for every request from this client:
workspace_client = Anthropic(
    default_headers={"anthropic-workspace-id": "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ"},
)

const client = new Anthropic(); // reads ANTHROPIC_API_KEY

// Required on every request for a multi-workspace key.
// Omit the second argument for a single-workspace key.
const message = await client.messages.create(
  {
    model: "claude-opus-5-5",
    max_tokens: 1024,
    messages: [{ role: "user", content: "Hello, Claude" }]
  },
  { headers: { "anthropic-workspace-id": "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ" } }
);
console.log(message.content);

// Or set it once for every request from this client:
const workspaceClient = new Anthropic({
  defaultHeaders: { "anthropic-workspace-id": "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ" }
});

AnthropicClient client = new(); // reads ANTHROPIC_API_KEY

MessageCreateParams parameters = new()
{
    Model = Model.ClaudeOpus5_5,
    MaxTokens = 1024,
    Messages = [new() { Role = Role.User, Content = "Hello, Claude" }],
};

// Required on every request for a multi-workspace key.
// Call client.Messages.Create(parameters) directly for a single-workspace key.
var message = await client
    .WithOptions(options =>
        options with
        {
            ExtraHeaders = new Dictionary<string, string>
            {
                ["anthropic-workspace-id"] = "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ",
            },
        }
    )
    .Messages.Create(parameters);
Console.WriteLine(message);

// Or set it once for every request from this client:
AnthropicClient workspaceClient = new(new ClientOptions
{
    ExtraHeaders = new Dictionary<string, string>
    {
        ["anthropic-workspace-id"] = "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ",
    },
});

client := anthropic.NewClient() // reads ANTHROPIC_API_KEY

// Required on every request for a multi-workspace key.
// Omit the option for a single-workspace key.
message, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
	Model:     anthropic.ModelClaudeOpus5_5,
	MaxTokens: 1024,
	Messages: []anthropic.MessageParam{
		anthropic.NewUserMessage(anthropic.NewTextBlock("Hello, Claude")),
	},
}, option.WithHeader("anthropic-workspace-id", "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ"))
if err != nil {
	log.Fatal(err)
}
fmt.Println(message.Content)

// Or set it once for every request from this client:
workspaceClient := anthropic.NewClient(
	option.WithHeader("anthropic-workspace-id", "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ"),
)

AnthropicClient client = AnthropicOkHttpClient.fromEnv(); // reads ANTHROPIC_API_KEY

// Required on every request for a multi-workspace key.
// Omit putAdditionalHeader for a single-workspace key.
Message message = client.messages().create(MessageCreateParams.builder()
    .model(Model.CLAUDE_OPUS_5_5)
    .maxTokens(1024)
    .addUserMessage("Hello, Claude")
    .putAdditionalHeader("anthropic-workspace-id", "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ")
    .build());

IO.println(message.content());

// Or set it once for every request from this client:
AnthropicClient workspaceClient = AnthropicOkHttpClient.builder()
    .fromEnv()
    .putHeader("anthropic-workspace-id", "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ")
    .build();

$client = new Client(); // reads ANTHROPIC_API_KEY

// Required on every request for a multi-workspace key.
// Omit requestOptions for a single-workspace key.
$message = $client->messages->create(
    model: Model::CLAUDE_OPUS_5_5,
    maxTokens: 1024,
    messages: [['role' => 'user', 'content' => 'Hello, Claude']],
    requestOptions: [
        'extraHeaders' => ['anthropic-workspace-id' => 'wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ'],
    ],
);

echo json_encode($message->content), PHP_EOL;

client = Anthropic::Client.new # reads ANTHROPIC_API_KEY

# Required on every request for a multi-workspace key.
# Omit request_options for a single-workspace key.
message = client.messages.create(
  model: Anthropic::Model::CLAUDE_OPUS_5_5,
  max_tokens: 1024,
  messages: [{role: "user", content: "Hello, Claude"}],
  request_options: {extra_headers: {"anthropic-workspace-id" => "wrkspc_01JwQvzr7rXLA5AGx3HKfFUJ"}}
)

puts message.content