Anthropic 平台文档（英文全量）

The API for accessing Claude on Google Cloud's Agent Platform is nearly identical to the Messages API, with two key differences in request format:

On Agent Platform, model is not passed in the request body. Instead, it is specified in the Google Cloud endpoint URL.
On Agent Platform, anthropic_version is passed in the request body (rather than as a header), and must be set to the value vertex-2023-10-16.

Agent Platform is also supported by Anthropic's official client SDKs. This guide walks you through making a request to Claude on Agent Platform using one of Anthropic's client SDKs.

Note that this guide assumes you already have a Google Cloud project that is able to use Agent Platform. See Anthropic Claude models on Agent Platform for more information on the setup required and a full walkthrough.

Install an SDK for accessing Agent Platform

First, install Anthropic's client SDK for your language of choice.

```bash
pip install -U "anthropic[vertex]"
```

```bash
npm install @anthropic-ai/vertex-sdk
```

```bash
dotnet add package Anthropic.Vertex
```

```bash
go get github.com/anthropics/anthropic-sdk-go
```

  ```groovy Gradle
  implementation("com.anthropic:anthropic-java:2.60.0")
  implementation("com.anthropic:anthropic-java-vertex:2.60.0")
  ```

  ```xml Maven
  &lt;dependency>
      &lt;groupId>com.anthropic&lt;/groupId>
      &lt;artifactId>anthropic-java&lt;/artifactId>
      &lt;version>2.60.0&lt;/version>
  &lt;/dependency>
  &lt;dependency>
      &lt;groupId>com.anthropic&lt;/groupId>
      &lt;artifactId>anthropic-java-vertex&lt;/artifactId>
      &lt;version>2.60.0&lt;/version>
  &lt;/dependency>
  ```

  ```java Java
  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;
  import com.anthropic.vertex.backends.VertexBackend;

  void main() \{
      AnthropicClient client = AnthropicOkHttpClient.builder()
          .backend(VertexBackend.fromEnv())
          .build();

      MessageCreateParams params = MessageCreateParams.builder()
          .model(Model.CLAUDE_OPUS_5)
          .maxTokens(1024L)
          .addUserMessage("What is the capital of France?")
          .build();

      Message response = client.messages().create(params);
      response.content().stream()
          .flatMap(block -> block.text().stream())
          .forEach(textBlock -> IO.println(textBlock.text()));
  \}
  ```

```bash
composer require anthropic-ai/sdk google/auth
```

```bash
# Gemfile
gem "anthropic"
gem "googleauth"
```

Accessing Agent Platform

Model availability

Note that Anthropic model availability varies by region. Search for "Claude" in the Model Garden or go to Anthropic Claude models for the latest information.

API model IDs

Lifecycle terms (Deprecated, Retired) are defined in Model deprecations. Lifecycle dates on partner-operated platforms are set by the partner and can differ from the Claude API schedule. For the current retirement date of any model on Agent Platform, see Google Cloud's documentation for Claude models on Agent Platform.

Model	Agent Platform API model ID
Claude Fable 5.1	claude-fable-5-1
Claude Fable 5	claude-fable-5
Claude Opus 5	claude-opus-5
Claude Opus 4.8	claude-opus-4-8
Claude Opus 4.7	claude-opus-4-7
Claude Opus 4.6	claude-opus-4-6
Claude Sonnet 5	`claude-sonnet-5`
Claude Sonnet 4.6	claude-sonnet-4-6
Claude Sonnet 4.5	claude-sonnet-4-5@20250929
Claude Sonnet 4 Deprecated.	claude-sonnet-4@20250514
Claude Sonnet 3.7 Retired.	claude-3-7-sonnet@20250219
Claude Opus 4.5	claude-opus-4-5@20251101
Claude Opus 4.1 Deprecated.	claude-opus-4-1@20250805
Claude Opus 4 Deprecated.	claude-opus-4@20250514
Claude Haiku 4.5	claude-haiku-4-5@20251001
Claude Haiku 3.5 Deprecated.	claude-3-5-haiku@20241022

Upgrading to a newer Claude model? In Claude Code, run /claude-api migrate to apply model ID swaps and breaking parameter changes across your codebase. The skill detects which cloud platform your code targets and adjusts model ID formats and feature changes for that platform. See Migrating to a newer Claude model.

Making requests

Before running requests you might need to run gcloud auth application-default login to authenticate with Google Cloud.

The following examples show how to generate text from Claude on Agent Platform:

bash

MODEL_ID=claude-opus-5
PROJECT_ID=MY_PROJECT_ID

curl https://aiplatform.googleapis.com/v1/projects/${PROJECT_ID}/locations/global/publishers/anthropic/models/${MODEL_ID}:rawPredict \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  -H "Content-Type: application/json" \
  -d '{
    "anthropic_version": "vertex-2023-10-16",
    "messages": [{"role": "user", "content": "Hey Claude!"}],
    "max_tokens": 100
  }'

bash

# The ant CLI does not support Agent Platform.

python

from anthropic import AnthropicVertex

project_id = "MY_PROJECT_ID"
region = "global"

client = AnthropicVertex(project_id=project_id, region=region)

message = client.messages.create(
    model="claude-opus-5",
    max_tokens=100,
    messages=[
        {
            "role": "user",
            "content": "Hey Claude!",
        }
    ],
)
print(message)

typescript

import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";

const projectId = "MY_PROJECT_ID";
const region = "global";

// Goes through the standard `google-auth-library` flow.
const client = new AnthropicVertex({
  projectId,
  region
});

const result = await client.messages.create({
  model: "claude-opus-5",
  max_tokens: 100,
  messages: [
    {
      role: "user",
      content: "Hey Claude!"
    }
  ]
});
console.log(JSON.stringify(result, null, 2));

csharp

using Anthropic.Models.Messages;
using Anthropic.Vertex;

var projectId = "MY_PROJECT_ID";
var region = "global";

var client = new AnthropicVertexClient(new AnthropicVertexCredentials(region, projectId));

var parameters = new MessageCreateParams
{
    Model = Model.ClaudeOpus5,
    MaxTokens = 100,
    Messages = [new() { Role = Role.User, Content = "Hey Claude!" }]
};

var message = await client.Messages.Create(parameters);
Console.WriteLine(message);

import (
	"context"
	"fmt"

	"github.com/anthropics/anthropic-sdk-go"
	"github.com/anthropics/anthropic-sdk-go/vertex"
)
// ...
	// Uses default Google Cloud credentials
	client := anthropic.NewClient(
		vertex.WithGoogleAuth(context.Background(), "global", "MY_PROJECT_ID"),
	)

	message, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{
		Model:     anthropic.ModelClaudeOpus5,
		MaxTokens: 100,
		Messages: []anthropic.MessageParam{
			anthropic.NewUserMessage(anthropic.NewTextBlock("Hey Claude!")),
		},
	})
	if err != nil {
		panic(err)
	}
	fmt.Printf("%+v\n", message)

java

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;
import com.anthropic.vertex.backends.VertexBackend;

void main() {
    // Uses default Google Cloud credentials
    AnthropicClient client = AnthropicOkHttpClient.builder()
        .backend(VertexBackend.fromEnv())
        .build();

    Message message = client
        .messages()
        .create(
            MessageCreateParams.builder()
                .model(Model.CLAUDE_OPUS_5)
                .maxTokens(100)
                .addUserMessage("Hey Claude!")
                .build()
        );

    IO.println(message);
}

php

<?php

use Anthropic\Vertex;

$client = Vertex\Client::fromEnvironment(
    location: 'global',
    projectId: 'MY_PROJECT_ID',
);

$message = $client->messages->create(
    maxTokens: 100,
    messages: [
        ['role' => 'user', 'content' => 'Hey Claude!']
    ],
    model: 'claude-opus-5',
);
$textBlock = array_find($message->content, static fn ($block): bool => $block->type === 'text');
echo $textBlock->text;

ruby

require "anthropic"

client = Anthropic::VertexClient.new(
  region: "global",
  project_id: "MY_PROJECT_ID"
)

message = client.messages.create(
  model: "claude-opus-5",
  max_tokens: 100,
  messages: [{role: "user", content: "Hey Claude!"}]
)

puts message.content.find { it.type == :text }.text

See the client SDKs and the official Agent Platform docs for more details.

Claude is also available through Amazon Bedrock, Claude Platform on AWS, and Microsoft Foundry.

Data retention

Data handling for this offering is governed by Google Cloud. For details, see Agent Platform and zero data retention.

Activity logging

Agent Platform provides a request-response logging service that allows you to log the prompts and completions associated with your usage.

Anthropic recommends that you log your activity on at least a 30-day rolling basis to understand your activity and investigate any potential misuse.

Turning on this service does not give Google or Anthropic any access to your content.

Feature support

For the full feature list with Google Cloud availability, see Features overview.

Supported feature highlights

Messages API
Prompt caching
Thinking
Tool use, including the Bash tool, Browser use tool, Computer use tool, Memory tool, and Text editor tool
Web search tool
Citations
Structured outputs

Features not supported

Input sources (URL sources for images and documents, Files API)
Server-side tools (code execution, web fetch, advisor)
Agent infrastructure (Agent Skills, MCP connector, programmatic tool calling)
API endpoints (Message Batches, Models, Admin, Compliance, Usage and Cost)
Claude Managed Agents
Server-side fallback (the fallbacks parameter; use the client-side fallback pattern instead)

Context window

Claude Fable 5.1, Claude Fable 5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, and Claude Sonnet 4.6 have a 1M-token context window on Agent Platform. Other Claude models, including Sonnet 4.5 and Sonnet 4 (deprecated), have a 200k-token context window.

Agent Platform limits request payloads to 30 MB. When sending large documents or many images, you might reach this limit before the token limit.

Global, multi-region, and regional endpoints

Agent Platform offers three endpoint types:

Global endpoints: Dynamic routing for maximum availability
Multi-region endpoints: Dynamic routing within a geographic area (for example, the United States or the European Union) for data residency with high availability
Regional endpoints: Guaranteed data routing through specific geographic regions

Regional and multi-region endpoints include a 10% pricing premium over global endpoints.

This applies to Claude Sonnet 4.5 and future models only. Older models (Claude Sonnet 4 (deprecated), Opus 4 (deprecated), and earlier) maintain their existing pricing structures.

When to use each option

Global endpoints (recommended):

Provide maximum availability and uptime
Dynamically route requests to regions with available capacity
No pricing premium
Best for applications where data residency is flexible
Only supports pay-as-you-go traffic (provisioned throughput requires regional endpoints)

Multi-region endpoints:

Dynamically route requests across regions within a geographic area (currently us and eu)
Useful when you need data residency within a broad geography but want higher availability than a single region
10% pricing premium over global endpoints
Only supports pay-as-you-go traffic (provisioned throughput requires regional endpoints)

Regional endpoints:

Route traffic through specific geographic regions
Required for single-region data residency, strict compliance mandates, or provisioned throughput
Support both pay-as-you-go and provisioned throughput
10% pricing premium reflects infrastructure costs for dedicated regional capacity

Implementation

Using global endpoints (recommended):

Set the region parameter to "global" when initializing the client:

bash

MODEL_ID=claude-opus-5
PROJECT_ID=MY_PROJECT_ID

curl https://aiplatform.googleapis.com/v1/projects/${PROJECT_ID}/locations/global/publishers/anthropic/models/${MODEL_ID}:rawPredict \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  -H "Content-Type: application/json" \
  -d '{
    "anthropic_version": "vertex-2023-10-16",
    "messages": [{"role": "user", "content": "Hey Claude!"}],
    "max_tokens": 100
  }'

bash

# The ant CLI does not support Agent Platform.

python

from anthropic import AnthropicVertex

project_id = "MY_PROJECT_ID"
region = "global"

client = AnthropicVertex(project_id=project_id, region=region)

message = client.messages.create(
    model="claude-opus-5",
    max_tokens=100,
    messages=[
        {
            "role": "user",
            "content": "Hey Claude!",
        }
    ],
)
print(message)

typescript

import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";

const projectId = "MY_PROJECT_ID";
const region = "global";

const client = new AnthropicVertex({
  projectId,
  region
});

const result = await client.messages.create({
  model: "claude-opus-5",
  max_tokens: 100,
  messages: [
    {
      role: "user",
      content: "Hey Claude!"
    }
  ]
});
console.log(JSON.stringify(result, null, 2));

csharp

using Anthropic.Models.Messages;
using Anthropic.Vertex;

var projectId = "MY_PROJECT_ID";
var region = "global";

var client = new AnthropicVertexClient(new AnthropicVertexCredentials(region, projectId));

var parameters = new MessageCreateParams
{
    Model = Model.ClaudeOpus5,
    MaxTokens = 100,
    Messages = [new() { Role = Role.User, Content = "Hey Claude!" }]
};

var message = await client.Messages.Create(parameters);
Console.WriteLine(message);

import (
	"context"
	"fmt"

	"github.com/anthropics/anthropic-sdk-go"
	"github.com/anthropics/anthropic-sdk-go/vertex"
)
// ...
	// Uses default Google Cloud credentials
	client := anthropic.NewClient(
		vertex.WithGoogleAuth(context.Background(), "global", "MY_PROJECT_ID"),
	)

	message, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{
		Model:     anthropic.ModelClaudeOpus5,
		MaxTokens: 100,
		Messages: []anthropic.MessageParam{
			anthropic.NewUserMessage(anthropic.NewTextBlock("Hey Claude!")),
		},
	})
	if err != nil {
		panic(err)
	}
	fmt.Printf("%+v\n", message)

java

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.models.messages.MessageCreateParams;
import com.anthropic.models.messages.Model;
import com.anthropic.vertex.backends.VertexBackend;
import com.google.auth.oauth2.GoogleCredentials;

void main() throws Exception {
    // Uses default Google Cloud credentials
    AnthropicClient client = AnthropicOkHttpClient.builder()
        .backend(
            VertexBackend.builder()
                .googleCredentials(GoogleCredentials.getApplicationDefault())
                .region("global")
                .project("MY_PROJECT_ID")
                .build()
        )
        .build();

    var message = client
        .messages()
        .create(
            MessageCreateParams.builder()
                .model(Model.CLAUDE_OPUS_5)
                .maxTokens(100)
                .addUserMessage("Hey Claude!")
                .build()
        );

    IO.println(message);
}

php

<?php

use Anthropic\Vertex;

$client = Vertex\Client::fromEnvironment(
    location: 'global',
    projectId: 'MY_PROJECT_ID',
);

$message = $client->messages->create(
    maxTokens: 100,
    messages: [
        ['role' => 'user', 'content' => 'Hey Claude!']
    ],
    model: 'claude-opus-5',
);

$textBlock = array_find($message->content, static fn ($block): bool => $block->type === 'text');
echo $textBlock->text;

ruby

require "anthropic"

client = Anthropic::VertexClient.new(
  region: "global",
  project_id: "MY_PROJECT_ID"
)

message = client.messages.create(
  model: "claude-opus-5",
  max_tokens: 100,
  messages: [{role: "user", content: "Hey Claude!"}]
)

puts message.content.find { it.type == :text }.text

Using multi-region endpoints:

Set the region parameter to a multi-region identifier: "us" for the United States or "eu" for the European Union. The SDK routes requests to the corresponding multi-region endpoint (https://aiplatform.us.rep.googleapis.com or https://aiplatform.eu.rep.googleapis.com), which dynamically balances traffic across regions within that geography.

bash

MODEL_ID=claude-opus-5
LOCATION=us # Multi-region identifier: "us" or "eu"
PROJECT_ID=MY_PROJECT_ID

curl https://aiplatform.${LOCATION}.rep.googleapis.com/v1/projects/${PROJECT_ID}/locations/${LOCATION}/publishers/anthropic/models/${MODEL_ID}:rawPredict \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  -H "Content-Type: application/json" \
  -d '{
    "anthropic_version": "vertex-2023-10-16",
    "messages": [{"role": "user", "content": "Hey Claude!"}],
    "max_tokens": 100
  }'

bash

# The ant CLI does not support Agent Platform.

python

from anthropic import AnthropicVertex

project_id = "MY_PROJECT_ID"
region = "us"  # Multi-region identifier: "us" or "eu"

client = AnthropicVertex(project_id=project_id, region=region)

message = client.messages.create(
    model="claude-opus-5",
    max_tokens=100,
    messages=[
        {
            "role": "user",
            "content": "Hey Claude!",
        }
    ],
)
print(message)

typescript

import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";

const projectId = "MY_PROJECT_ID";
const region = "us"; // Multi-region identifier: "us" or "eu"

const client = new AnthropicVertex({
  projectId,
  region
});

const result = await client.messages.create({
  model: "claude-opus-5",
  max_tokens: 100,
  messages: [
    {
      role: "user",
      content: "Hey Claude!"
    }
  ]
});
console.log(JSON.stringify(result, null, 2));

csharp

using Anthropic.Models.Messages;
using Anthropic.Vertex;

var projectId = "MY_PROJECT_ID";
var region = "us"; // Multi-region identifier: "us" or "eu"

var client = new AnthropicVertexClient(new AnthropicVertexCredentials(region, projectId));

var parameters = new MessageCreateParams
{
    Model = Model.ClaudeOpus5,
    MaxTokens = 100,
    Messages = [new() { Role = Role.User, Content = "Hey Claude!" }]
};

var message = await client.Messages.Create(parameters);
Console.WriteLine(message);

import (
	"context"
	"fmt"

	"github.com/anthropics/anthropic-sdk-go"
	"github.com/anthropics/anthropic-sdk-go/vertex"
)
// ...
	// Multi-region identifier: "us" or "eu"
	client := anthropic.NewClient(
		vertex.WithGoogleAuth(context.Background(), "us", "MY_PROJECT_ID"),
	)

	message, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{
		Model:     anthropic.ModelClaudeOpus5,
		MaxTokens: 100,
		Messages: []anthropic.MessageParam{
			anthropic.NewUserMessage(anthropic.NewTextBlock("Hey Claude!")),
		},
	})
	if err != nil {
		panic(err)
	}
	fmt.Printf("%+v\n", message)

java

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.models.messages.MessageCreateParams;
import com.anthropic.models.messages.Model;
import com.anthropic.vertex.backends.VertexBackend;
import com.google.auth.oauth2.GoogleCredentials;

void main() throws Exception {
    // Multi-region identifier: "us" or "eu"
    AnthropicClient client = AnthropicOkHttpClient.builder()
        .backend(
            VertexBackend.builder()
                .googleCredentials(GoogleCredentials.getApplicationDefault())
                .region("us")
                .project("MY_PROJECT_ID")
                .build()
        )
        .build();

    var message = client
        .messages()
        .create(
            MessageCreateParams.builder()
                .model(Model.CLAUDE_OPUS_5)
                .maxTokens(100)
                .addUserMessage("Hey Claude!")
                .build()
        );

    IO.println(message);
}

php

<?php

use Anthropic\Vertex;

$client = Vertex\Client::fromEnvironment(
    location: 'us', // Multi-region identifier: "us" or "eu"
    projectId: 'MY_PROJECT_ID',
);

$message = $client->messages->create(
    maxTokens: 100,
    messages: [
        ['role' => 'user', 'content' => 'Hey Claude!']
    ],
    model: 'claude-opus-5',
);
$textBlock = array_find($message->content, static fn ($block): bool => $block->type === 'text');
echo $textBlock->text;

ruby

require "anthropic"

client = Anthropic::VertexClient.new(
  region: "us", # Multi-region identifier: "us" or "eu"
  project_id: "MY_PROJECT_ID"
)

message = client.messages.create(
  model: "claude-opus-5",
  max_tokens: 100,
  messages: [{role: "user", content: "Hey Claude!"}]
)

puts message.content.find { it.type == :text }.text

Using regional endpoints:

Specify a specific region such as "us-east5" or "europe-west1":

bash

# Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
MODEL_ID=claude-sonnet-4-6
LOCATION=us-east5 # Specify a specific region
PROJECT_ID=MY_PROJECT_ID

curl https://${LOCATION}-aiplatform.googleapis.com/v1/projects/${PROJECT_ID}/locations/${LOCATION}/publishers/anthropic/models/${MODEL_ID}:rawPredict \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  -H "Content-Type: application/json" \
  -d '{
    "anthropic_version": "vertex-2023-10-16",
    "messages": [{"role": "user", "content": "Hey Claude!"}],
    "max_tokens": 100
  }'

bash

# The ant CLI does not support Agent Platform.

python

from anthropic import AnthropicVertex

project_id = "MY_PROJECT_ID"
region = "us-east5"  # Specify a specific region

client = AnthropicVertex(project_id=project_id, region=region)

message = client.messages.create(
    # Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
    model="claude-sonnet-4-6",
    max_tokens=100,
    messages=[
        {
            "role": "user",
            "content": "Hey Claude!",
        }
    ],
)
print(message)

typescript

import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";

const projectId = "MY_PROJECT_ID";
const region = "us-east5"; // Specify a specific region

const client = new AnthropicVertex({
  projectId,
  region
});

const result = await client.messages.create({
  // Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
  model: "claude-sonnet-4-6",
  max_tokens: 100,
  messages: [
    {
      role: "user",
      content: "Hey Claude!"
    }
  ]
});
console.log(JSON.stringify(result, null, 2));

csharp

using Anthropic.Models.Messages;
using Anthropic.Vertex;

var projectId = "MY_PROJECT_ID";
var region = "us-east5"; // Specify a specific region

var client = new AnthropicVertexClient(new AnthropicVertexCredentials(region, projectId));

var parameters = new MessageCreateParams
{
    // Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
    Model = Model.ClaudeSonnet4_6,
    MaxTokens = 100,
    Messages = [new() { Role = Role.User, Content = "Hey Claude!" }]
};

var message = await client.Messages.Create(parameters);
Console.WriteLine(message);

import (
	"context"
	"fmt"

	"github.com/anthropics/anthropic-sdk-go"
	"github.com/anthropics/anthropic-sdk-go/vertex"
)
// ...
	// Specify a specific region
	client := anthropic.NewClient(
		vertex.WithGoogleAuth(context.Background(), "us-east5", "MY_PROJECT_ID"),
	)

	message, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{
		// Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
		Model:     anthropic.ModelClaudeSonnet4_6,
		MaxTokens: 100,
		Messages: []anthropic.MessageParam{
			anthropic.NewUserMessage(anthropic.NewTextBlock("Hey Claude!")),
		},
	})
	if err != nil {
		panic(err)
	}
	fmt.Printf("%+v\n", message)

java

import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.models.messages.MessageCreateParams;
import com.anthropic.models.messages.Model;
import com.anthropic.vertex.backends.VertexBackend;
import com.google.auth.oauth2.GoogleCredentials;

void main() throws Exception {
    // Uses default Google Cloud credentials with specific region
    AnthropicClient client = AnthropicOkHttpClient.builder()
        .backend(
            VertexBackend.builder()
                .googleCredentials(GoogleCredentials.getApplicationDefault())
                .region("us-east5") // Specify a specific region
                .project("MY_PROJECT_ID")
                .build()
        )
        .build();

    var message = client
        .messages()
        .create(
            MessageCreateParams.builder()
                // Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
                .model(Model.CLAUDE_SONNET_4_6)
                .maxTokens(100)
                .addUserMessage("Hey Claude!")
                .build()
        );

    IO.println(message);
}

php

<?php

use Anthropic\Vertex;

$client = Vertex\Client::fromEnvironment(
    location: 'us-east5',
    projectId: 'MY_PROJECT_ID',
);

$message = $client->messages->create(
    maxTokens: 100,
    messages: [
        ['role' => 'user', 'content' => 'Hey Claude!']
    ],
    // Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
    model: 'claude-sonnet-4-6',
);
echo $message->content[0]->text;

ruby

require "anthropic"

client = Anthropic::VertexClient.new(
  region: "us-east5", # Specify a specific region
  project_id: "MY_PROJECT_ID"
)

message = client.messages.create(
  # Specific regional endpoints support Claude Sonnet 4.6 and earlier; newer models use the global or multi-region endpoints
  model: "claude-sonnet-4-6",
  max_tokens: 100,
  messages: [{role: "user", content: "Hey Claude!"}]
)

puts message.content.first.text

Claude Mythos Preview is a research preview available to invited customers on Agent Platform. For more information, see Project Glasswing.

Additional resources

Agent Platform pricing: Generative AI pricing on cloud.google.com
Claude models documentation: Claude on Agent Platform
Google blog post: Global endpoint for Claude models
Anthropic pricing details: Cloud platform pricing

messages

batches

organization

federation

sessions

events

threads

vaults

activities

batches

Anthropic 平台文档（英文全量） ​

Install an SDK for accessing Agent Platform ​

Accessing Agent Platform ​

Model availability ​

API model IDs ​

Making requests ​

Data retention ​

Activity logging ​

Feature support ​

Supported feature highlights ​

Features not supported ​

Context window ​

Global, multi-region, and regional endpoints ​

When to use each option ​

Implementation ​

Additional resources ​

Anthropic 平台文档（英文全量）

Install an SDK for accessing Agent Platform

Accessing Agent Platform

Model availability

API model IDs

Making requests

Data retention

Activity logging

Feature support

Supported feature highlights

Features not supported

Context window

Global, multi-region, and regional endpoints

When to use each option

Implementation

Additional resources