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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.

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More

  • Added claude-fable-5 to the Anthropic catalog at 10/10 / 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
  • Fable refusal responses now participate in configured model fallback chains
  • Refusals without a configured fallback surface as clear LLM content-filter errors