> ## Documentation Index
> Fetch the complete documentation index at: https://docs.openpawz.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Anthropic

> Use Claude Opus 4, Claude Sonnet 4, and other Anthropic models.

# Anthropic

Use Claude Opus 4, Claude Sonnet 4, and other Anthropic models.

## Setup

1. Get an API key at [console.anthropic.com/settings/keys](https://console.anthropic.com/settings/keys)
2. In Pawz → **Settings → Providers** → **Add Provider** → **Anthropic**
3. Paste your API key

## Configuration

| Setting       | Default                        |
| ------------- | ------------------------------ |
| Base URL      | `https://api.anthropic.com/v1` |
| API key       | Required                       |
| Default model | —                              |

## Models

| Model                      | Best for                           |
| -------------------------- | ---------------------------------- |
| `claude-opus-4-20250514`   | Most capable, complex tasks        |
| `claude-sonnet-4-20250514` | Great balance of speed and quality |
| `claude-haiku-4-20250506`  | Fastest, cheapest                  |
| `claude-3-haiku-20240307`  | Legacy fast model                  |

## Prefix routing

Model names starting with `claude*` or `anthropic*` auto-route to Anthropic.

## Notes

Anthropic uses a custom API format (not OpenAI-compatible). Pawz has a dedicated `AnthropicProvider` implementation that handles the differences automatically, including:

* Message format conversion
* Tool use format
* Streaming delta handling
* Extended thinking support