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Make Fable 5 the boss and GPT-5.6 Sol the worker, in one command

The exact setup: the Codex plugin, the config file that unlocks GPT-5.6 Sol, and the /route skill itself, copy-paste ready, starting from zero installs.

  • The 4 commands that install the Codex plugin in Claude Code
  • The .codex/config.toml line that points Codex at GPT-5.6 Sol
  • The full /route skill file, ready to paste in
  • A copy-paste demo prompt to test the loop end to end

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The from-scratch guide to wiring Fable 5 and GPT-5.6 Sol into one plan-build-review loop.

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What's inside

01

What's Inside

The 4 commands that install the Codex plugin The one config line that unlocks GPT-5.6 Sol as the worker model The /route skill file itself, copy-paste ready The idea: stop picking sides between Fable 5 and GPT-5.6.

02

PREREQUISITES

Node.js v18 or newer (Codex CLI needs it) Claude Code installed and signed in An OpenAI account with Codex access (or Codex CLI already authenticated) Node.js: install the LTS version Claude Code docs: install + sign in Codex: CLI + auth

03

INSTALL THE CODEX PLUGIN

This is what lets Claude Code hand work to Codex without leaving your session.

About the author

Cooper Simson

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

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