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Fable 5.1 Is The Boss. Astra Does The Work.

The three-step setup that puts OpenAI's GPT-6 Astra to work inside Claude Code under Fable 5.1, plus the exact model-routing block from my global CLAUDE.md file, so both usage limits last longer and every task gets planned, built, and reviewed by two models.

  • Why two models on one team beats picking a side (and saves usage limit on both)
  • The three-step setup: Codex, the Claude Code plugin, and the routing block
  • The exact CLAUDE.md routing block I use, copy and paste
  • What the two plans cost against three entry-level hires

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The three-step setup that puts OpenAI's GPT-6 Astra to work inside Claude Code under Fable 5.1, plus the exact model-routing block from my global CLAUDE.md file, so both usage limits last longer and every task gets planned, built, and reviewed by two models.

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A look inside

What's inside

01

What's Inside

What you need before you start The Codex settings that point the CLI at GPT-6 Astra The full model routing block for your global CLAUDE.md file How Fable dispatches work, reviews it, and sends back fixes

02

What you need

Claude Code with a Claude Max plan (Fable 5.1 is the boss).

03

Model routing

Model Use for --- --- Fable 5.1 (this session) Planning, architecture, hooks and copy, brand voice, final review GPT-6 Astra (Codex, gpt-6-astra) The hardest coding, multi-file refactors, computer-use tasks, anything a cheaper model failed twice GPT-5.6 Sol (Codex, gpt-5.6-sol) R

About the author

Cooper Simson

Founder of Actionable AI. 30,000+ operators read the newsletter.

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No. The guide explains the work in practical steps and calls out technical details only when they matter.

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