claude-in-microsoft-foundry changedbuild-with-claude/claude-in-microsoft-foundry

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---
title: Claude in Microsoft Foundry
url: https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry
description: Access Claude models through Microsoft Foundry with Azure-native endpoints and authentication.
---

This guide shows you how to set up and make API calls to Claude in Microsoft Foundry using one of Anthropic's client SDKs or direct HTTP requests. When you access Claude in Microsoft Foundry, you are billed for Claude usage in the Azure Marketplace. You can use the latest Claude models, including Claude Opus 5, Claude Opus 4.8, and Claude Sonnet 5, and features such as the [1M-token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows), while managing costs through your Azure subscription.

Claude is available in Global Standard and US Data Zone Standard deployment types in Foundry resources, billed in Claude Consumption Units through the Azure Marketplace. Visit [Claude in Microsoft Foundry pricing](https://platform.claude.com/docs/en/about-claude/pricing#claude-in-microsoft-foundry-pricing) for details.

## Hosting options

Claude models in Microsoft Foundry are available in two hosting options. You choose the hosting option when you configure the deployment.

|                      | Hosted on Azure                                            | Hosted on Anthropic                                                                                                                                                                              |
| -------------------- | ---------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Where inference runs | Anthropic-operated service running on Azure infrastructure | Anthropic-operated service running on Anthropic infrastructure                                                                                                                                   |
| Model availability   | The latest models in the Opus, Sonnet, and Haiku families  | All Claude models available on Microsoft Foundry                                                                                                                                                 |
| Deployment types     | Global Standard, US Data Zone Standard                     | Global Standard                                                                                                                                                                                  |
| Recommended for      | Most workloads                                             | [Access to features or models not yet hosted on Azure](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#additional-features-not-supported-when-hosted-on-azure) |

<Note>
  Anthropic acts as an independent processor for Microsoft. Customers using Claude through Microsoft Foundry are subject to Anthropic's data use terms. For deployments hosted on Azure, prompts and completions remain within Azure. Only usage metadata and content flagged by Anthropic's safety systems egress to Anthropic. Anthropic continues to provide its safety and data commitments.
</Note>

## Prerequisites

Before you begin, ensure you have:

* An active Azure subscription
* Access to the [Foundry portal](https://ai.azure.com/)
* The [Azure CLI](https://learn.microsoft.com/en-us/cli/azure/install-azure-cli) installed (required for the Entra ID cURL example, optional otherwise)
* An Azure RBAC role that allows you to use the resource, such as **Foundry User** (formerly Azure AI User) or **Cognitive Services User**

## Install an SDK

Anthropic's [client SDKs](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) support Foundry through a platform-specific package or client class. The examples on this page also show requests with cURL and the ant CLI. To set up the CLI, see [CLI quickstart](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/quickstart).

<Note>
  Foundry is supported by the C#, Java, PHP, Python, and TypeScript SDKs. Foundry is not currently available in the Go and Ruby SDKs.
</Note>

<Tabs>
  <Tab title="Python">
    ```bash
    pip install -U "anthropic"

    # For Entra ID authentication, also install the Azure Identity library
    pip install azure-identity
    ```
  </Tab>

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

    # For Entra ID authentication, also install the Azure Identity library
    npm install @azure/identity
    ```
  </Tab>

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

  <Tab title="Go">
    ```bash
    # The Go SDK does not yet support Foundry natively (see the Authentication
    # examples for using the standard Go SDK as a workaround)
    go get github.com/anthropics/anthropic-sdk-go
    ```
  </Tab>

  <Tab title="Java">
    <Tabs>
      <Tab title="Gradle">
        ```kotlin
        implementation("com.anthropic:anthropic-java-foundry:2.53.0")

        // For Entra ID authentication, also add the Azure Identity library
        implementation("com.azure:azure-identity:1.18.3")
        ```
      </Tab>

      <Tab title="Maven">
        ```xml
        <dependency>
            <groupId>com.anthropic</groupId>
            <artifactId>anthropic-java-foundry</artifactId>
            <version>2.53.0</version>
        </dependency>
        <!-- For Entra ID authentication, also add the Azure Identity library -->
        <dependency>
            <groupId>com.azure</groupId>
            <artifactId>azure-identity</artifactId>
            <version>1.18.3</version>
        </dependency>
        ```
      </Tab>
    </Tabs>
  </Tab>

  <Tab title="PHP">
    ```bash
    composer require "anthropic-ai/sdk" "guzzlehttp/guzzle:^7"
    ```
  </Tab>

  <Tab title="Ruby">
    ```bash
    # The Ruby SDK does not yet support Foundry natively (see the Authentication
    # examples for using the standard Ruby SDK as a workaround)
    # Gemfile
    gem "anthropic"
    ```
  </Tab>
</Tabs>

## Provisioning

Foundry uses a two-level hierarchy: **resources** contain your security and billing configuration, while **deployments** are the model instances you call through the API. You'll first create a Foundry resource, then create one or more Claude deployments within it.

### Provisioning Foundry resources

Create a Foundry resource, which is required to use and manage services in Azure. You can follow these instructions to create a [Foundry resource](https://learn.microsoft.com/en-us/azure/ai-services/multi-service-resource?pivots=azportal#create-a-new-azure-ai-foundry-resource). Alternatively, you can start by creating a [Foundry project](https://learn.microsoft.com/en-us/azure/foundry/how-to/create-projects), which involves creating a Foundry resource.

To provision your resource:

1. Navigate to the [Foundry portal](https://ai.azure.com/).
2. Create a new Foundry resource or select an existing one.
3. Configure access management using Azure-issued API keys or Entra ID (formerly Azure Active Directory) for role-based access control.
4. Optionally configure the resource to be part of a private network (Azure Virtual Network) to restrict network access to your resource.
5. Note your resource name. You'll use this as `{resource}` in API endpoints (for example, `https://{resource}.services.ai.azure.com/anthropic/v1/*`).

### Creating Foundry deployments

After creating your resource, deploy a Claude model to make it available for API calls. These steps describe the new Foundry portal (the **New Foundry** toggle is on):

1. Sign in to the Foundry portal. From the portal homepage, select **Discover** in the upper-right navigation, then **Models** in the left pane to open the model catalog.

2. Search for and select a Claude model (for example, claude-opus-5). Each model appears once in the catalog regardless of how many hosting options it supports.

3. On the model card, select **Deploy**, then **Custom settings** to open the deployment settings pane. If you choose **Default settings** instead, the deployment is automatically configured as Hosted on Azure for models available in both hosting options.

4. On your first Claude deployment, review the Azure Marketplace terms, select an industry, and select **Agree and Proceed** to accept the terms and subscribe to the Azure Marketplace offer.

5. Configure the deployment:

   * **Deployment name:** Defaults to the model ID, but you can customize it (for example, `my-claude-deployment`). The deployment name cannot be changed after creation.
   * **Region scope:** Select Global, or for models hosted on Azure, Data Zone. Selecting Data Zone creates a US Data Zone Standard deployment, which keeps inference within the United States and is equivalent to setting [`inference_geo: "us"`](https://platform.claude.com/docs/en/manage-claude/data-residency#inference-geo) on the Claude API.
   * **Model version:** Expand **Model version settings** and select a version from the **Model version** dropdown menu. Each [hosting option](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry#hosting-options) is listed as a separate model version, labeled with its hosting option (for example, version 1 for Hosted on Anthropic, version 2 for Hosted on Azure).

6. Select **Deploy** and wait for provisioning to complete.

7. Once deployed, select **Build** in the upper-right navigation, then **Models** in the left pane, and open your deployment. The **Details** tab shows the **Target URI** (your endpoint URL) and **Key** (your API key).

If the **New Foundry** toggle is off, you are in the classic portal layout. There, open **Model catalog** in the left pane to find and deploy a model, and open **Models + endpoints** (under **My assets**) to view your deployments and their endpoint details.

<Note>
  The deployment name you choose becomes the value you pass in the `model` parameter of your API requests. You can create multiple deployments of the same model with different names to manage separate configurations or rate limits.
</Note>

## Authentication

Claude in Microsoft Foundry supports two authentication methods: API keys and Entra ID tokens. Both methods use Azure-hosted endpoints in the format `https://{resource}.services.ai.azure.com/anthropic/v1/*`.

### API key authentication

After provisioning your Foundry Claude resource, you can obtain an API key from the Foundry portal:

1. In the Foundry portal, select **Build** in the upper-right navigation, then **Models** in the left pane.
2. Open your Claude deployment and select the **Details** tab.
3. Copy the **Key** value (and note the **Target URI** for your endpoint).
4. Use either the `api-key` or `x-api-key` header in your requests, or provide it to the SDK.

The Foundry SDKs require an API key and either a resource name or base URL. The C#, Java, PHP, Python, and TypeScript SDKs automatically read these from the following environment variables if they are defined:

* `ANTHROPIC_FOUNDRY_API_KEY` - Your API key
* `ANTHROPIC_FOUNDRY_RESOURCE` - Your resource name (for example, `example-resource`)
* `ANTHROPIC_FOUNDRY_BASE_URL` - Alternative to resource name: the full base URL (for example, `https://example-resource.services.ai.azure.com/anthropic/`). The C# SDK does not read this variable: it always constructs the base URL from the resource name.

<Note>
  The `resource` and `base_url` parameters are mutually exclusive. Provide either the resource name (which the SDK uses to construct the URL as `https://{resource}.services.ai.azure.com/anthropic/`) or the full base URL directly.
</Note>

**Example using API key:**

<CodeGroup>
  ```bash cURL
  curl https://{resource}.services.ai.azure.com/anthropic/v1/messages \
    -H "content-type: application/json" \
    -H "api-key: YOUR_AZURE_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -d '{
      "model": "claude-opus-5",
      "max_tokens": 1024,
      "messages": [
        {"role": "user", "content": "Hello!"}
      ]
    }'
  ```

  ```bash CLI
  # ant reads ANTHROPIC_API_KEY and sends it as x-api-key, which Foundry accepts
  export ANTHROPIC_API_KEY="YOUR_AZURE_API_KEY"

  ant messages create \
    --base-url https://example-resource.services.ai.azure.com/anthropic \
    --model claude-opus-5 \
    --max-tokens 1024 \
    --message '{role: user, content: "Hello!"}' \
    --transform content
  ```

  ```python Python
  import os
  from anthropic import AnthropicFoundry

  client = AnthropicFoundry(
      api_key=os.environ.get("ANTHROPIC_FOUNDRY_API_KEY"),
      resource="example-resource",  # your resource name
  )

  message = client.messages.create(
      model="claude-opus-5",
      max_tokens=1024,
      messages=[{"role": "user", "content": "Hello!"}],
  )
  print(message.content)
  ```

  ```typescript TypeScript
  import AnthropicFoundry from "@anthropic-ai/foundry-sdk";

  const client = new AnthropicFoundry({
    apiKey: process.env.ANTHROPIC_FOUNDRY_API_KEY,
    resource: "example-resource" // your resource name
  });

  const message = await client.messages.create({
    model: "claude-opus-5",
    max_tokens: 1024,
    messages: [{ role: "user", content: "Hello!" }]
  });
  console.log(message.content);
  ```

  ```csharp C#
  using Anthropic.Foundry;
  using Anthropic.Models.Messages;

  var client = new AnthropicFoundryClient(
      new AnthropicFoundryApiKeyCredentials(
          Environment.GetEnvironmentVariable("ANTHROPIC_FOUNDRY_API_KEY")!,
          "example-resource"
      )
  );

  var response = await client.Messages.Create(new MessageCreateParams
  {
      Model = "claude-opus-5",
      MaxTokens = 1024,
      Messages = [new() { Role = Role.User, Content = "Hello!" }],
  });

  Console.WriteLine(
      string.Join("", response.Content
          .Select(block => block.Value)
          .OfType<TextBlock>()
          .Select(textBlock => textBlock.Text)));
  ```

  ```go Go
  // The Go SDK does not yet support Foundry natively. This example uses the
  // standard Go SDK as a workaround. WithoutEnvironmentDefaults keeps the
  // client from also reading ANTHROPIC_API_KEY or ANTHROPIC_AUTH_TOKEN from
  // the environment and sending a Claude API credential to your Foundry
  // endpoint. Features that Foundry does not support fail server-side rather
  // than client-side. For full Foundry support, use the C#, Java, PHP,
  // Python, or TypeScript SDKs.
  package main

  import (
  	"context"
  	"fmt"
  	"os"

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

  func main() {
  	client := anthropic.NewClient(
  		option.WithoutEnvironmentDefaults(),
  		option.WithBaseURL("https://example-resource.services.ai.azure.com/anthropic"),
  		option.WithAPIKey(os.Getenv("ANTHROPIC_FOUNDRY_API_KEY")),
  	)

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