Anthropic details Fable 5 orchestration, advisor mode, and cache costs
brada · x · 2026-07-25
Anthropic’s follow-up to its Fable 5 webinar explains how its model-orchestration stack actually works.
Key points:
- The advisor pattern lets a cheaper worker model consult a stronger model only when it gets stuck.
- In Claude Code, the shortcut is /advisor opus; Fable-as-advisor is temporarily unavailable.
- The setup works in the API and Claude Code, server-side on Anthropic’s infrastructure, not on Bedrock, Vertex, or Foundry.
- Sonnet + Fable reportedly reaches 92% of Fable-alone quality at 63% of the cost on SWE-bench Pro.
- Prompt caches on the worker side remain intact, but advisor reads are re-processed at advisor-model rates; optional advisor-side ephemeral caching exists but is off by default.
The post also points readers to the orchestrator pattern, advisor docs, and the recorded demo session.
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