Codex Model Router

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Apps & Tools

Cost-efficient model and reasoning-effort routing skill for OpenAI Codex.

byAlan Liu

Open source

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Description

A Codex skill that routes tasks across GPT-5.6 Luna, Terra, and Sol, escalating difficult work to GPT-6 Astra to optimize token usage. It provides decision support by recommending the lowest suitable model and reasoning effort for a given task, featuring a two-step confirmation workflow to prevent over-provisioning.

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Details

Why this is interesting: Implements a novel routing strategy for frontier GPT-6 and GPT-5.6 models to optimize cost and performance in agentic…
Attributed to: @alanliuc-a11y
Built with: GPT-6 Astra GPT-5.6 Luna GPT-5.6 Terra GPT-5.6 Sol GPT Image 2 GPT-5 Codex Redwood AI
Links: View tweet
Tags: #codex-skill #model-routing #token-optimization #openai

Discovered: X
First posted: X · Sep 6, 2026
Listed: Added 10d ago
Build: Strong
Models: Strong

Prompt

Use the Skill Installer to install the Codex skill from GitHub repository alanliuc-a11y/codex-model-router, using path . and the skill name model-router. After installation, enable its global routing workflow by running the included script for my operating system. Preserve my existing AGENTS.md instructions and tell me when it is ready.

Source