***

title: Extended Variant
subtitle: 'Extended context windows with :extended'
headline: Extended Variant | Extended Context Windows
canonical-url: '[https://openrouter.ai/docs/guides/routing/model-variants/extended](https://openrouter.ai/docs/guides/routing/model-variants/extended)'
'og:site\_name': OpenRouter Documentation
'og:title': Extended Variant - Extended Context Windows
'og:description': 'Access extended context window versions of models using the :extended variant.'
'og:image':
type: url
value: >-
[https://openrouter.ai/dynamic-og?title=Extended%20Variant\&description=Extended%20context%20windows](https://openrouter.ai/dynamic-og?title=Extended%20Variant\&description=Extended%20context%20windows)
'og:image:width': 1200
'og:image:height': 630
'twitter:card': summary\_large\_image
'twitter:site': '@OpenRouter'
noindex: false
nofollow: false
---------------

The `:extended` variant provides access to model versions with extended context windows.

## Usage

Append `:extended` to any model ID:

```json
{
  "model": "anthropic/claude-sonnet-4.5:extended"
}
```

## Details

Extended variants offer larger context windows than the standard model versions, allowing you to process longer inputs and maintain more conversation history.