> ## 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.

# Claude Fable 5 support

## Claude Fable 5 support

Fabro now includes Anthropic's `claude-fable-5` in the built-in model catalog, with `fable` and `claude-fable` aliases. It supports the model's 1M context window, 128K max output, vision, tools, prompt caching, and native `reasoning_effort` levels without changing the default Anthropic model from `claude-sonnet-4-6`.

Fable refusals are now handled through Fabro's provider-neutral fallback system. When Anthropic returns `stop_reason: "refusal"`, Fabro surfaces a content-filter LLM error with the refusal detail preserved and retries through `run.model.fallbacks` when configured.

## More

<Accordion title="Models">
  * Added `claude-fable-5` to the Anthropic catalog at $10 / $50 per MTok input/output pricing
  * Added aliases `fable` and `claude-fable`
  * Kept `claude-sonnet-4-6` as the Anthropic default
  * Omitted deprecated Anthropic sampling parameters for Fable requests
</Accordion>

<Accordion title="Fallbacks">
  * Fable refusal responses now participate in configured model fallback chains
  * Refusals without a configured fallback surface as clear LLM content-filter errors
</Accordion>