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Dan McAteer (@daniel_mac8) discovered that GPT-5.6 'Luna' is currently not…

2026-08-02 · 15:21 UTC ·@daniel_mac8 ·1 min read

Brief

Dan McAteer (@daniel_mac8) reports that while building the free open-source Codex plugin 'sol-advisor' he found GPT-5.6 'Luna' blocked from use as a subagent; his workaround—declaring Luna as a custom agent—prevents context sharing. 'sol-advisor' orchestrates GPT-5.6 Sol High, Luna Max, Terra Max, and a fresh Sol reviewer, and McAteer asks @OpenAIDevs to permit Luna as a subagent to improve efficiency.

Why it matters

Dan McAteer (@daniel_mac8) discovered that GPT-5.6 'Luna' is currently not permitted to be used as a subagent while building the free open-source Codex plugin 'sol-advisor'; his workaround was to declare Luna as a custom agent, which does not share context with the main agent.

Key details

  • 'sol-advisor' chains multiple GPT-5.6 models: Sol High as orchestrator, Luna Max for routine tasks, Terra Max for complex tasks, and a fresh Sol instance as reviewer; McAteer claims this setup greatly improves efficiency and challenges users to hit weekly usage limits.
  • McAteer asked @OpenAIDevs (published 2026-08-02 15:21:31+00:00) to allow Luna as a subagent so the plugin can share context and better leverage Luna's efficiency.
Source evidence

Hey @OpenAIDevs I discovered this while building ‘sol-advisor’:

> Luna is currently not permitted to use as a subagent

My workaround was to declare it as a custom agent, but afaik it doesn’t share context with the main agent in that case?

Would be excellent to allow Luna as a subagent so we can even better take advantage of the efficiency.

Dan McAteer (@daniel_mac8)

Codex users: here's an amazing way to take advantage of the efficiency and capability of GPT-5.6 Luna Max.

It's called 'sol-advisor'.

  1. GPT-5.6 Sol High as orchestrator

  2. GPT-5.6 Luna Max as implementer for routine tasks

  3. GPT-5.6 Terra Max as implementer for complex tasks

  4. Fresh GPT-5.6 Sol instance as reviewer

A free and open-source plugin for Codex. Installation instructions below 👇

I dare you to install it, and tell me if you hit your weekly usage limits using 'sol-advisor'. I doubt you can.

Video

— https://nitter.net/daniel_mac8/status/2083607027813662810#m