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+# Claude Platform-Specific Guide
+
+How to use Claude on different cloud platforms.
+
+## Anthropic API (Direct)
+
+### Basic Usage
+
+```python
+from langchain_anthropic import ChatAnthropic
+
+llm = ChatAnthropic(
+    model="claude-sonnet-4-5",
+    anthropic_api_key="sk-ant-..."
+)
+```
+
+### Listing Models
+
+```python
+import anthropic
+import os
+
+client = anthropic.Anthropic(api_key=os.getenv("ANTHROPIC_API_KEY"))
+models = client.models.list()
+
+for model in models.data:
+    print(f"{model.id} - {model.display_name}")
+```
+
+## Google Vertex AI
+
+### Model ID Format
+
+Vertex AI uses `@` notation:
+
+```
+claude-opus-4-1@20250805
+claude-sonnet-4@20250514
+claude-haiku-4.5@20251001
+```
+
+### Usage
+
+```python
+from langchain_google_vertexai import ChatVertexAI
+
+llm = ChatVertexAI(
+    model="claude-haiku-4.5@20251001",
+    project="your-gcp-project",
+    location="us-central1"
+)
+```
+
+### Environment Setup
+
+```bash
+# GCP authentication
+gcloud auth application-default login
+
+# Environment variables
+export GOOGLE_CLOUD_PROJECT="your-project-id"
+export GOOGLE_CLOUD_LOCATION="us-central1"
+```
+
+## AWS Bedrock
+
+### Model ID Format
+
+Bedrock uses ARN format:
+
+```
+anthropic.claude-opus-4-1-20250805-v1:0
+anthropic.claude-sonnet-4-20250514-v1:0
+anthropic.claude-haiku-4-5-20251001-v1:0
+```
+
+### Usage
+
+```python
+from langchain_aws import ChatBedrock
+
+llm = ChatBedrock(
+    model_id="anthropic.claude-haiku-4-5-20251001-v1:0",
+    region_name="us-east-1",
+    model_kwargs={
+        "temperature": 0.7,
+        "max_tokens": 4096
+    }
+)
+```
+
+### Environment Setup
+
+```bash
+# AWS CLI configuration
+aws configure
+
+# Or environment variables
+export AWS_ACCESS_KEY_ID="your-access-key"
+export AWS_SECRET_ACCESS_KEY="your-secret-key"
+export AWS_DEFAULT_REGION="us-east-1"
+```
+
+## Azure AI (Microsoft Foundry)
+
+> **Release**: Public preview started in November 2025
+
+### Model ID Format
+
+Azure AI uses the same format as Anthropic API:
+
+```
+claude-opus-4-1
+claude-sonnet-4-5
+claude-haiku-4-5
+```
+
+### Available Models
+
+- **Claude Opus 4.1** (`claude-opus-4-1`)
+- **Claude Sonnet 4.5** (`claude-sonnet-4-5`)
+- **Claude Haiku 4.5** (`claude-haiku-4-5`)
+
+### Usage
+
+```python
+# Calling Claude using Azure OpenAI SDK
+import os
+from openai import AzureOpenAI
+
+client = AzureOpenAI(
+    azure_endpoint=os.getenv("AZURE_FOUNDRY_ENDPOINT"),
+    api_key=os.getenv("AZURE_FOUNDRY_API_KEY"),
+    api_version="2024-12-01-preview"
+)
+
+# Specify deployment name (default is same as model ID)
+response = client.chat.completions.create(
+    model="claude-sonnet-4-5",  # Or your custom deployment name
+    messages=[
+        {"role": "user", "content": "Hello"}
+    ]
+)
+```
+
+### Custom Deployments
+
+You can set custom deployment names in the Foundry portal:
+
+```python
+# Using custom deployment name
+response = client.chat.completions.create(
+    model="my-custom-claude-deployment",
+    messages=[...]
+)
+```
+
+### Environment Setup
+
+```bash
+export AZURE_FOUNDRY_ENDPOINT="https://your-foundry-resource.azure.com"
+export AZURE_FOUNDRY_API_KEY="your-api-key"
+```
+
+### Region Limitations
+
+Currently available in the following regions:
+- **East US2**
+- **Sweden Central**
+
+Deployment type: **Global Standard**
+
+## Platform-Specific Features
+
+| Platform | Model ID Format | Benefits | Drawbacks |
+|----------------|------------|---------|-----------|
+| **Anthropic API** | `claude-sonnet-4-5` | Instant access to latest models | Single provider dependency |
+| **Vertex AI** | `claude-sonnet-4@20250514` | Integration with GCP services | Complex setup |
+| **AWS Bedrock** | `anthropic.claude-sonnet-4-20250514-v1:0` | Integration with AWS ecosystem | Complex model ID format |
+| **Azure AI** | `claude-sonnet-4-5` | Azure + GPT and Claude integration | Region limitations |
+
+## Cross-Platform Fallback
+
+```python
+from langchain_anthropic import ChatAnthropic
+from langchain_google_vertexai import ChatVertexAI
+from langchain_aws import ChatBedrock
+
+# Primary and fallback (multi-platform support)
+primary = ChatAnthropic(model="claude-sonnet-4-5")
+fallback_gcp = ChatVertexAI(
+    model="claude-sonnet-4@20250514",
+    project="your-project"
+)
+fallback_aws = ChatBedrock(
+    model_id="anthropic.claude-sonnet-4-20250514-v1:0",
+    region_name="us-east-1"
+)
+
+# Fallback across three platforms
+llm = primary.with_fallbacks([fallback_gcp, fallback_aws])
+```
+
+## Model ID Comparison Table
+
+| Anthropic API | Vertex AI | AWS Bedrock | Azure AI |
+|--------------|-----------|-------------|----------|
+| `claude-opus-4-1-20250805` | `claude-opus-4-1@20250805` | `anthropic.claude-opus-4-1-20250805-v1:0` | `claude-opus-4-1` |
+| `claude-sonnet-4-5` | `claude-sonnet-4@20250514` | `anthropic.claude-sonnet-4-20250514-v1:0` | `claude-sonnet-4-5` |
+| `claude-haiku-4-5-20251001` | `claude-haiku-4.5@20251001` | `anthropic.claude-haiku-4-5-20251001-v1:0` | `claude-haiku-4-5` |
+
+## Reference Links
+
+- [Anthropic API Documentation](https://docs.anthropic.com/)
+- [Vertex AI Claude Models](https://docs.cloud.google.com/vertex-ai/generative-ai/docs/partner-models/claude)
+- [AWS Bedrock Claude Models](https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-claude.html)
+- [Azure AI Claude Documentation](https://learn.microsoft.com/en-us/azure/ai-foundry/foundry-models/how-to/use-foundry-models-claude)
+- [Claude in Microsoft Foundry Announcement](https://www.anthropic.com/news/claude-in-microsoft-foundry)