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+# Anthropic Claude Model IDs
+
+List of available model IDs for the Anthropic Claude API.
+
+> **Last Updated**: 2025-11-24
+
+## Model List
+
+### Claude 4.x (2025)
+
+| Model ID | Context | Max Output | Release | Features |
+|-----------|------------|---------|---------|------|
+| `claude-opus-4-1-20250805` | 200K | 32K | 2025-08 | Most powerful. Complex reasoning & code generation |
+| `claude-sonnet-4-5` | 1M | 64K | 2025-09 | Latest balanced model (recommended) |
+| `claude-sonnet-4-20250514` | 200K (1M beta) | 64K | 2025-05 | Production recommended (date-fixed) |
+| `claude-haiku-4-5-20251001` | 200K | 64K | 2025-10 | Fast & low-cost |
+
+**Model Characteristics**:
+- **Opus**: Highest performance, complex tasks (200K context)
+- **Sonnet**: Balanced, general-purpose (1M context)
+- **Haiku**: Fast & low-cost ($1/M input, $5/M output)
+
+## Basic Usage
+
+```python
+from langchain_anthropic import ChatAnthropic
+
+# Recommended: Latest Sonnet
+llm = ChatAnthropic(model="claude-sonnet-4-5")
+
+# Production: Date-fixed version
+llm = ChatAnthropic(model="claude-sonnet-4-20250514")
+
+# Fast & low-cost
+llm = ChatAnthropic(model="claude-haiku-4-5-20251001")
+
+# Highest performance
+llm = ChatAnthropic(model="claude-opus-4-1-20250805")
+```
+
+### Environment Variables
+
+```bash
+export ANTHROPIC_API_KEY="sk-ant-..."
+```
+
+## Model Selection Guide
+
+| Use Case | Recommended Model |
+|------|-----------|
+| Cost-focused | `claude-haiku-4-5-20251001` |
+| Balanced | `claude-sonnet-4-5` |
+| Performance-focused | `claude-opus-4-1-20250805` |
+| Production | `claude-sonnet-4-20250514` (date-fixed) |
+
+## Claude Features
+
+### 1. Large Context Window
+
+Claude Sonnet 4.5 supports **1M tokens** context window:
+
+| Model | Standard Context | Max Output | Notes |
+|--------|---------------|---------|------|
+| Sonnet 4.5 | 1M | 64K | Latest version |
+| Sonnet 4 | 200K (1M beta) | 64K | 1M available with beta header |
+| Opus 4.1 | 200K | 32K | High-performance version |
+| Haiku 4.5 | 200K | 64K | Fast version |
+
+```python
+# Using 1M context (Sonnet 4.5)
+llm = ChatAnthropic(
+    model="claude-sonnet-4-5",
+    max_tokens=64000  # Max output: 64K
+)
+
+# Enable 1M context for Sonnet 4 (beta)
+llm = ChatAnthropic(
+    model="claude-sonnet-4-20250514",
+    default_headers={"anthropic-beta": "max-tokens-3-5-sonnet-2024-07-15"}
+)
+```
+
+### 2. Date-Fixed Versions
+
+For production environments, date-fixed versions are recommended to prevent unexpected updates:
+
+```python
+# ✅ Recommended (production)
+llm = ChatAnthropic(model="claude-sonnet-4-20250514")
+
+# ⚠️ Caution (development only)
+llm = ChatAnthropic(model="claude-sonnet-4")
+```
+
+### 3. Tool Use (Function Calling)
+
+Claude has powerful tool use capabilities (see [Tool Use Guide](06_llm_model_ids_claude_tools.md) for details).
+
+### 4. Multi-Platform Support
+
+Available on multiple cloud platforms (see [Platform-Specific Guide](06_llm_model_ids_claude_platforms.md) for details):
+
+- Anthropic API (direct)
+- Google Vertex AI
+- AWS Bedrock
+- Azure AI (Microsoft Foundry)
+
+## Deprecated Models
+
+| Model | Deprecation Date | Migration Target |
+|--------|-------|--------|
+| Claude 3 Opus | 2025-07-21 | `claude-opus-4-1-20250805` |
+| Claude 3 Sonnet | 2025-07-21 | `claude-sonnet-4-5` |
+| Claude 2.1 | 2025-07-21 | `claude-sonnet-4-5` |
+
+## Detailed Documentation
+
+For advanced settings and parameters:
+- **[Claude Advanced Features](06_llm_model_ids_claude_advanced.md)** - Parameter configuration, streaming, caching
+- **[Platform-Specific Guide](06_llm_model_ids_claude_platforms.md)** - Usage on Vertex AI, AWS Bedrock, Azure AI
+- **[Tool Use Guide](06_llm_model_ids_claude_tools.md)** - Function Calling implementation
+
+## Reference Links
+
+- [Claude API Official](https://docs.anthropic.com/en/docs/about-claude/models/overview)
+- [Anthropic Console](https://console.anthropic.com/)
+- [LangChain Integration](https://docs.langchain.com/oss/python/integrations/chat/anthropic)