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

# Anthropic fast mode and deep model testing

## Anthropic fast mode

You can now enable Anthropic's fast mode for up to 2.5x faster output from Claude Opus 4.6 by setting `speed: fast` in your workflow stylesheet. This is useful for latency-sensitive stages where throughput matters more than cost.

```dot theme={"languages":{"custom":["/languages/dot.json","/languages/fabro.json"]}}
graph {
  graph [stylesheet="speed=fast"]
}
```

## `fabro model test --deep`

Model validation now supports a `--deep` flag that runs multi-turn tool-use conversations to verify that a provider handles the full agent loop correctly — not just single-turn completions. Tests run concurrently with a progress bar.

```bash theme={"languages":{"custom":["/languages/dot.json","/languages/fabro.json"]}}
fabro model test --deep
```

## More

<Accordion title="Fixes">
  * Fixed workflow TOML config being lost when running in detach mode
  * Fixed edge `thread_id` precedence to match documented fidelity behavior
  * Fixed Sonnet 4.5 `reasoning_effort` parameter error by converting to the thinking API format
  * Fixed OpenAI reasoning round-trip losing encrypted content by setting `store: false`
  * Fixed OpenAI provider incorrectly omitting `store: true` from requests
  * Suppressed stderr output noise in detach and create modes
</Accordion>