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

# Routing

> Steer requests for speed, price or behaviour with model suffixes.

Add a suffix to a model `id` to control how the request is routed.

| Suffix      | Effect                                     |
| ----------- | ------------------------------------------ |
| `:nitro`    | Route to the fastest available provider.   |
| `:floor`    | Route to the lowest-cost provider.         |
| `:online`   | Enable live web search for this request.   |
| `:thinking` | Enable extended reasoning where supported. |

```bash theme={null}
"model": "claude-sonnet-4.6:nitro"    # fastest
"model": "gpt-5.5:floor"              # cheapest
"model": "gpt-5.5:online"             # with web search
```

<Note>
  Not every suffix applies to every model. Unsupported suffixes are ignored.
</Note>