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

# Anthropic

> Configure the Anthropic provider profile in Loong.

# Anthropic

Use this when your team already runs on Anthropic and you want that vendor family to stay explicit in Loong config instead of disappearing behind a generic compatibility route.

## At A Glance

| Field            | Value                                   |
| ---------------- | --------------------------------------- |
| Built-in kind    | `anthropic`                             |
| Provider group   | Direct Hosted Providers                 |
| Protocol family  | `anthropic_messages`                    |
| Feature family   | `anthropic`                             |
| Auth scheme      | `x_api_key`                             |
| Credential envs  | ANTHROPIC\_API\_KEY                     |
| Aliases          | `anthropic_compatible`                  |
| Default base URL | `https://api.anthropic.com`             |
| Request endpoint | `https://api.anthropic.com/v1/messages` |
| Models endpoint  | `https://api.anthropic.com/v1/models`   |

## Minimal Config

```toml theme={null}
active_provider = "anthropic"

[providers.anthropic]
kind = "anthropic"
api_key = { env = "ANTHROPIC_API_KEY" }
model = "auto"
```

## Verify It

```bash theme={null}
loong doctor
loong runtime models list
loong ask --message "Say hello and name the active provider."
```

If `runtime models list` is unreliable for this account or region, pin an explicit `provider.model` or add `preferred_models` instead of leaving recovery implicit.

## Auth And Routing Contract

| Contract                    | Value                                   |
| --------------------------- | --------------------------------------- |
| Auth optional               | no                                      |
| Model probe auth optional   | no                                      |
| Default API key env         | `ANTHROPIC_API_KEY`                     |
| OAuth env                   | none                                    |
| Primary request route       | `https://api.anthropic.com/v1/messages` |
| Primary model-catalog route | `https://api.anthropic.com/v1/models`   |

## Operator Notes

* Default headers are injected automatically: `anthropic-version: 2023-06-01`.

## Related Docs

* Continue to [Providers And Models](/use-loong/providers-and-models) when you still need the broader chooser page.
* Continue to [Provider Guides](/use-loong/provider-guides/index) for the full built-in provider matrix.
* Continue to [Provider Recipes](/use-loong/provider-recipes) for representative rollout recipes.
* Continue to [Configuration Patterns](/use-loong/configuration-patterns) for the shared provider-profile shape.