← Back to daily report

build-with-claude/claude-on-vertex-ai.md

Changed on 2026-03-21 12:23:21 EST

+7 lines added
-7 lines removed
Visual Diff
# Claude on Vertex AI¶

Anthropic's Claude models are now generally available through [Vertex AI](https://cloud.google.com/vertex-ai).¶

---¶

The Vertex API for accessing Claude is nearly-identical to the [Messages API](/docs/en/api/messages) and supports all of the same options, with two key differences:¶

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

Vertex is also supported by Anthropic's official [client SDKs](/docs/en/api/client-sdks). This guide walks you through making a request to Claude on Vertex AI using one of Anthropic's client SDKs.¶

Note that this guide assumes you already have a GCP project that is able to use Vertex AI. See [using the Claude 3 models from Anthropic](https://cloud.google.com/vertex-ai/generative-ai/docs/partner-models/use-claude) for more information on the setup required, as well as a full walkthrough.¶

## Install an SDK for accessing Vertex AI¶

First, install Anthropic's [client SDK](/docs/en/api/client-sdks) for your language of choice.¶

<Tabs>¶
<Tab title="Python">¶
```bash¶
pip install -U google-cloud-aiplatform "anthropic[vertex]"¶
```¶
</Tab>¶

<Tab title="TypeScript">¶
```bash¶
npm install @anthropic-ai/vertex-sdk¶
```¶
</Tab>¶

<Tab title="C#">¶
```bash¶
dotnet add package Anthropic.Vertex¶
```¶
</Tab>¶

<Tab title="Go">¶
```bash¶
go get github.com/anthropics/anthropic-sdk-go¶
```¶
</Tab>¶

<Tab title="Java">¶
<CodeGroup>¶
```groovy Gradle¶
implementation("com.anthropic:anthropic-java-vertex:2.18.0")¶
```¶

```xml Maven¶
<dependency>¶
<groupId>com.anthropic</groupId>¶
<artifactId>anthropic-java-vertex</artifactId>¶
<version>2.18.0</version>¶
</dependency>¶
```¶

```java Java nocheck hidelines={17..9,-12..}¶
import com.anthropic.client.AnthropicClient;¶
import com.anthropic.client.okhttp.AnthropicOkHttpClient;¶
import com.anthropic.vertex.backends.VertexBackend;¶
import com.anthropic.models.messages.MessageCreateParams;¶
import com.anthropic.models.messages.Message;¶
import com.anthropic.models.messages.Model;¶

public class BasicMessage {¶
public static void main(String[] args) {¶
AnthropicClient client = AnthropicOkHttpClient.builder()¶
.backend(VertexBackend.fromEnv())¶
.build();¶

MessageCreateParams params = MessageCreateParams.builder()¶
.model(Model.CLAUDE_OPUS_4_6)¶
.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 -> System.out.println(textBlock.text()));¶
}¶
}¶
```¶
</CodeGroup>¶
</Tab>¶

<Tab title="PHP">¶
```bash¶
composer require anthropic-ai/sdk google/auth¶
```¶
</Tab>¶

<Tab title="Ruby">¶
```bash¶
# Gemfile¶
gem "anthropic"¶
gem "googleauth"¶
```¶
</Tab>¶
</Tabs>¶

## Accessing Vertex AI¶

### Model availability¶

Note that Anthropic model availability varies by region. Search for "Claude" in the [Vertex AI Model Garden](https://cloud.google.com/model-garden) or go to [Use Claude 3](https://cloud.google.com/vertex-ai/generative-ai/docs/partner-models/use-claude) for the latest information.¶

#### API model IDs¶

| Model | Vertex AI API model ID |¶
| ------------------------------ | ------------------------ |¶
| Claude Opus 4.6 | claude-opus-4-6 |¶
| Claude Sonnet 4.6 | claude-sonnet-4-6 |¶
| Claude Sonnet 4.5 | claude-sonnet-4-5@20250929 |¶
| Claude Sonnet 4 | claude-sonnet-4@20250514 |¶
| Claude Sonnet 3.7 <Tooltip tooltipContent="Retired as of February 19, 2026.">⚠️</Tooltip> | claude-3-7-sonnet@20250219 |¶
| Claude Opus 4.5 | claude-opus-4-5@20251101 |¶
| Claude Opus 4.1 | claude-opus-4-1@20250805 |¶
| Claude Opus 4 | claude-opus-4@20250514 |¶
| Claude Haiku 4.5 | claude-haiku-4-5@20251001 |¶
| Claude Haiku 3.5 <Tooltip tooltipContent="Retired as of February 19, 2026.">⚠️</Tooltip> | claude-3-5-haiku@20241022 |¶
| Claude Haiku 3 <Tooltip tooltipContent="Deprecated as of February 19, 2026. Retiring April 19, 2026.">⚠️</Tooltip> | claude-3-haiku@20240307 |¶

### Making requests¶

Before running requests you may need to run `gcloud auth application-default login` to authenticate with GCP.¶

The following examples show how to generate text from Claude on Vertex AI:¶
<CodeGroup>¶


```bash Shell nocheck¶
MODEL_ID=claude-opus-4-6¶
LOCATION=global¶
PROJECT_ID=MY_PROJECT_ID¶

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


```python Python nocheck¶
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-4-6",¶
max_tokens=100,¶
messages=[¶
{¶
"role": "user",¶
"content": "Hey Claude!",¶
}¶
],¶
)¶
print(message)¶
```¶


```typescript TypeScript nocheck hidelines={1..2}
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¶
});¶

async function main() {¶
const result = await client.messages.create({¶
model: "claude-opus-4-6",¶
max_tokens: 100,¶
messages: [¶
{¶
role: "user",¶
content: "Hey Claude!"¶
}¶
]¶
});¶
console.log(JSON.stringify(result, null, 2));¶
}¶

main();¶
```¶


```csharp C# nocheck¶
using Anthropic;¶
using Anthropic.Models.Messages;¶
using Anthropic.Vertex;¶

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

var client = new AnthropicClient¶
{¶
Backend = new VertexBackend(projectId, region)¶
};¶

var parameters = new MessageCreateParams¶
{¶
Model = Model.ClaudeOpus4_6,¶
MaxTokens = 100,¶
Messages = [new() { Role = Role.User, Content = "Hey Claude!" }]¶
};¶

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


```go Go nocheck hidelines={1..2,10..11,-1}¶
package main¶

import (¶
"context"¶
"fmt"¶

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

func main() {¶
// 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: "claude-opus-4-6",¶
MaxTokens: 100,¶
Messages: []anthropic.MessageParam{¶
anthropic.NewUserMessage(anthropic.NewTextBlock("Hey Claude!")),¶
},¶
})¶
if err != nil {¶
panic(err)¶
}¶
fmt.Printf("%+v\n", message)¶
}¶
```¶


```java Java nocheck hidelines={16..9,-12..}¶
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.vertex.backends.VertexBackend;¶

public class VertexExample {¶

public static void main(String[] args) {¶
// Uses default Google Cloud credentials¶
AnthropicClient client = AnthropicOkHttpClient.builder()¶
.backend(VertexBackend.fromEnv())¶
.build();¶

Message message = client¶
.messages()¶
.create(¶
MessageCreateParams.builder()¶
.model("claude-opus-4-6")¶
.maxTokens(100)¶
.addUserMessage("Hey Claude!")¶
.build()¶
);¶

System.out.println(message);¶
}¶
}¶
```¶


```php PHP nocheck¶
<?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-4-6',¶
);¶
echo $message->content[0]->text;¶
```¶


```ruby Ruby nocheck¶
require "anthropic"¶

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

message = client.messages.create(¶
model: "claude-opus-4-6",¶
max_tokens: 100,¶
messages: [{role: "user", content: "Hey Claude!"}]¶
)¶

puts message.content.first.text¶
```¶
</CodeGroup>¶

See the [client SDKs](/docs/en/api/client-sdks) and the official [Vertex AI docs](https://cloud.google.com/vertex-ai/docs) for more details.¶

Claude is also available through [Amazon Bedrock](/docs/en/build-with-claude/claude-on-amazon-bedrock) and [Microsoft Foundry](/docs/en/build-with-claude/claude-in-microsoft-foundry).¶

## Activity logging¶

Vertex provides a [request-response logging service](https://cloud.google.com/vertex-ai/generative-ai/docs/multimodal/request-response-logging) that allows customers 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 in order to understand your activity and investigate any potential misuse.¶

<Note>¶
Turning on this service does not give Google or Anthropic any access to your content.¶
</Note>¶

## Feature support¶
For all currently supported features on Vertex AI, see [API features overview](/docs/en/api/overview).¶

### Context window¶

Claude Opus 4.6, Sonnet 4.6, Sonnet 4.5, and Sonnet 4 have a [1M-token context window](/docs/en/build-with-claude/context-windows) on Vertex AI.¶

<Note>¶
For Claude Sonnet 4.5 and Sonnet 4, the 1M-token context window is in beta. To use, include the `context-1m-2025-08-07` [beta header](/docs/en/api/beta-headers) in your API requests.¶
</Note>¶

Vertex AI limits request payloads to 30 MB. When sending large documents or many images, you may reach this limit before the token limit.¶

## Global vs regional endpoints¶

Starting with **Claude Sonnet 4.5 and all future models**, Google Vertex AI offers two endpoint types:¶

- **Global endpoints:** Dynamic routing for maximum availability¶
- **Regional endpoints:** Guaranteed data routing through specific geographic regions¶

Regional endpoints include a 10% pricing premium over global endpoints.¶

<Note>¶
This applies to Claude Sonnet 4.5 and future models only. Older models (Claude Sonnet 4, Opus 4, and earlier) maintain their existing pricing structures.¶
</Note>¶

### 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)¶

**Regional endpoints:**¶
- Route traffic through specific geographic regions¶
- Required for data residency and compliance requirements¶
- 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:¶

<CodeGroup>¶

```python Python nocheck¶
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-4-6",¶
max_tokens=100,¶
messages=[¶
{¶
"role": "user",¶
"content": "Hey Claude!",¶
}¶
],¶
)¶
print(message)¶
```¶

```typescript TypeScript nocheck hidelines={1..2}
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-4-6",¶
max_tokens: 100,¶
messages: [¶
{¶
role: "user",¶
content: "Hey Claude!"¶
}¶
]¶
});¶
```¶

```csharp C# nocheck¶
using Anthropic;¶
using Anthropic.Models.Messages;¶
using Anthropic.Vertex;¶

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

var client = new AnthropicClient¶
{¶
Backend = new VertexBackend(projectId, region)¶
};¶

var parameters = new MessageCreateParams¶
{¶
Model = Model.ClaudeOpus4_6,¶
MaxTokens = 100,¶
Messages = [new() { Role = Role.User, Content = "Hey Claude!" }]¶
};¶

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

```go Go nocheck hidelines={1..2,9..10,-1}¶
package main¶

import (¶
"context"¶

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

func main() {¶
// Uses default Google Cloud credentials¶
client := anthropic.NewClient(¶
vertex.WithGoogleAuth(context.Background(), "global", "MY_PROJECT_ID"),¶
)¶

message, _ := client.Messages.New(context.Background(), anthropic.MessageNewParams{¶
Model: "claude-opus-4-6",¶
MaxTokens: 100,¶
Messages: []anthropic.MessageParam{¶
anthropic.NewUserMessage(anthropic.NewTextBlock("Hey Claude!")),¶
},¶
})¶
_ = message¶
}¶
```¶

```java Java nocheck hidelines={1..5}
import com.anthropic.client.AnthropicClient;¶
import com.anthropic.client.okhttp.AnthropicOkHttpClient;¶
import com.anthropic.models.messages.MessageCreateParams;¶
import com.anthropic.vertex.backends.VertexBackend;¶

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

var message = client¶
.messages()¶
.create(¶
MessageCreateParams.builder()¶
.model("claude-opus-4-6")¶
.maxTokens(100)¶
.addUserMessage("Hey Claude!")¶
.build()¶
);¶
```¶

```php PHP nocheck¶
<?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-4-6',¶
);¶

echo $message->content[0]->text;¶
```¶

```ruby Ruby nocheck¶
require "anthropic"¶

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

message = client.messages.create(¶
model: "claude-opus-4-6",¶
max_tokens: 100,¶
messages: [{role: "user", content: "Hey Claude!"}]¶
)¶

puts message.content.first.text¶
```¶
</CodeGroup>¶

**Using regional endpoints:**¶

Specify a specific region like `"us-east1"` or `"europe-west1"`:¶

<CodeGroup>¶

```python Python nocheck¶
from anthropic import AnthropicVertex¶

project_id = "MY_PROJECT_ID"¶
region = "us-east1" # Specify a specific region¶

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

message = client.messages.create(¶
model="claude-opus-4-6",¶
max_tokens=100,¶
messages=[¶
{¶
"role": "user",¶
"content": "Hey Claude!",¶
}¶
],¶
)¶
print(message)¶
```¶

```typescript TypeScript nocheck hidelines={1..2}
import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";¶

const projectId = "MY_PROJECT_ID";¶
const region = "us-east1"; // Specify a specific region¶

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

const result = await client.messages.create({¶
model: "claude-opus-4-6",¶
max_tokens: 100,¶
messages: [¶
{¶
role: "user",¶
content: "Hey Claude!"¶
}¶
]¶
});¶
```¶

```csharp C# nocheck¶
using Anthropic;¶
using Anthropic.Models.Messages;¶
using Anthropic.Vertex;¶

var projectId = "MY_PROJECT_ID";¶
var region = "us-east1";¶

AnthropicClient client = new()¶
{¶
Backend = new VertexBackend(projectId, region)¶
};¶

var parameters = new MessageCreateParams¶
{¶
Model = Model.ClaudeOpus4_6,¶
MaxTokens = 100,¶
Messages = [new() { Role = Role.User, Content = "Hey Claude!" }]¶
};¶

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

```go Go nocheck hidelines={1..2,9..10,-1}¶
package main¶

import (¶
"context"¶

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

func main() {¶
// Specify a specific region¶
client := anthropic.NewClient(¶
vertex.WithGoogleAuth(context.Background(), "us-east1", "MY_PROJECT_ID"),¶
)¶

message, _ := client.Messages.New(context.Background(), anthropic.MessageNewParams{¶
Model: "claude-opus-4-6",¶
MaxTokens: 100,¶
Messages: []anthropic.MessageParam{¶
anthropic.NewUserMessage(anthropic.NewTextBlock("Hey Claude!")),¶
},¶
})¶
_ = message¶
}¶
```¶

```java Java nocheck hidelines={1..5}
import com.anthropic.client.AnthropicClient;¶
import com.anthropic.client.okhttp.AnthropicOkHttpClient;¶
import com.anthropic.models.messages.MessageCreateParams;¶
import com.anthropic.vertex.backends.VertexBackend;¶

// Uses default Google Cloud credentials with specific region¶
AnthropicClient client = AnthropicOkHttpClient.builder()¶
.backend(¶
VertexBackend.builder()¶
.region("us-east1") // Specify a specific region¶
.project("MY_PROJECT_ID")¶
.build()¶
)¶
.build();¶

var message = client¶
.messages()¶
.create(¶
MessageCreateParams.builder()¶
.model("claude-opus-4-6")¶
.maxTokens(100)¶
.addUserMessage("Hey Claude!")¶
.build()¶
);¶
```¶

```php PHP nocheck¶
<?php¶

use Anthropic\Vertex;¶

$client = Vertex\Client::fromEnvironment(¶
location: 'us-east1',¶
projectId: 'MY_PROJECT_ID',¶
);¶

$message = $client->messages->create(¶
maxTokens: 100,¶
messages: [¶
['role' => 'user', 'content' => 'Hey Claude!']¶
],¶
model: 'claude-opus-4-6',¶
);¶
echo $message->content[0]->text;¶
```¶

```ruby Ruby nocheck¶
require "anthropic"¶

client = Anthropic::VertexClient.new(¶
region: "us-east1", # Specify a specific region¶
project_id: "MY_PROJECT_ID"¶
)¶

message = client.messages.create(¶
model: "claude-opus-4-6",¶
max_tokens: 100,¶
messages: [{role: "user", content: "Hey Claude!"}]¶
)¶

puts message.content.first.text¶
```¶
</CodeGroup>¶

### Additional resources¶

- **Google Vertex AI pricing:** [cloud.google.com/vertex-ai/generative-ai/pricing](https://cloud.google.com/vertex-ai/generative-ai/pricing)¶
- **Claude models documentation:** [Claude on Vertex AI](https://cloud.google.com/vertex-ai/generative-ai/docs/partner-models/claude)¶
- **Google blog post:** [Global endpoint for Claude models](https://cloud.google.com/blog/products/ai-machine-learning/global-endpoint-for-claude-models-generally-available-on-vertex-ai)¶
- **Anthropic pricing details:** [Pricing documentation](/docs/en/about-claude/pricing#third-party-platform-pricing)

Unified Diff

--- a/build-with-claude/claude-on-vertex-ai.md
+++ b/build-with-claude/claude-on-vertex-ai.md
@@ -56,7 +56,7 @@
 </dependency>
 ```
 
-```java Java nocheck hidelines={1..9,-1}
+```java Java nocheck hidelines={7..9,-2..}
 import com.anthropic.client.AnthropicClient;
 import com.anthropic.client.okhttp.AnthropicOkHttpClient;
 import com.anthropic.vertex.backends.VertexBackend;
@@ -174,7 +174,7 @@
   ```
 
   
-  ```typescript TypeScript nocheck hidelines={1..2}
+  ```typescript TypeScript nocheck
   import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";
 
   const projectId = "MY_PROJECT_ID";
@@ -229,7 +229,7 @@
   ```
 
   
-  ```go Go nocheck hidelines={1..11,-1}
+  ```go Go nocheck hidelines={1..2,10..11,-1}
   package main
 
   import (
@@ -261,7 +261,7 @@
   ```
 
   
-  ```java Java nocheck hidelines={1..9,-1}
+  ```java Java nocheck hidelines={6..9,-2..}
   import com.anthropic.client.AnthropicClient;
   import com.anthropic.client.okhttp.AnthropicOkHttpClient;
   import com.anthropic.models.messages.Message;
@@ -415,7 +415,7 @@
 print(message)
 ```
 
-```typescript TypeScript nocheck hidelines={1..2}
+```typescript TypeScript nocheck
 import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";
 
 const projectId = "MY_PROJECT_ID";
@@ -462,7 +462,7 @@
 Console.WriteLine(message);
 ```
 
-```go Go nocheck hidelines={1..10,-1}
+```go Go nocheck hidelines={1..2,9..10,-1}
 package main
 
 import (
@@ -489,7 +489,7 @@
 }
 ```
 
-```java Java nocheck hidelines={1..5}
+```java Java nocheck
 import com.anthropic.client.AnthropicClient;
 import com.anthropic.client.okhttp.AnthropicOkHttpClient;
 import com.anthropic.models.messages.MessageCreateParams;
@@ -577,7 +577,7 @@
 print(message)
 ```
 
-```typescript TypeScript nocheck hidelines={1..2}
+```typescript TypeScript nocheck
 import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";
 
 const projectId = "MY_PROJECT_ID";
@@ -624,7 +624,7 @@
 Console.WriteLine(message);
 ```
 
-```go Go nocheck hidelines={1..10,-1}
+```go Go nocheck hidelines={1..2,9..10,-1}
 package main
 
 import (
@@ -651,7 +651,7 @@
 }
 ```
 
-```java Java nocheck hidelines={1..5}
+```java Java nocheck
 import com.anthropic.client.AnthropicClient;
 import com.anthropic.client.okhttp.AnthropicOkHttpClient;
 import com.anthropic.models.messages.MessageCreateParams;