Codex Orchestrator v0.2.1: GPT-6 Sol orchestrator with Luna subagents

Melvin Vivas · X post · 2026-09-23 · Open on X

Topics: AI Agents, Tool Use & MCP, AI Dev Tools & Productivity · Level: intermediate

Summary

Melvin Vivas shares v0.2.1 of his open-source Codex orchestrator setup. In this setup a stronger GPT-6 model (Astra or Sol) acts as the orchestrator and hands work to GPT-6 Luna subagents. He invites people to fork the repo and adapt it into their own multi-agent coding setup.

Key points

• Version 0.2.1 adds 2 new GPT-6 profiles that use Sol as the orchestrator.
• All subagents were upgraded to GPT-6 Luna.
• Pattern: a capable model plans and delegates, while subagents run on a different model (Luna) to do the work.
• The setup runs inside OpenAI Codex using profiles and subagents.
• The repo is open to fork so you can build your own orchestrator and subagent setup.

Resources mentioned

• donvito/codex-astra-luna-orchestrator · repo · github.com · free
  The creator's Codex skill for an orchestrator-plus-subagents setup (Astra orchestrator, Luna subagents), configured through config.toml.
  Also in: Codex Orchestrator Pattern: Astra/Sol Orchestrator with Luna Subagents (Melvin Vivas on X · notes), Open-source Codex skill: Astra/Sol orchestrator with Luna subagents (Melvin Vivas on X · notes), Cost-Efficient Codex Subagents: Astra/Sol Orchestrator + Luna Workers (Melvin Vivas on X · notes), Orchestrator/Subagent Patterns: Astra-Luna Skill vs Fusion and Advisor (Melvin Vivas on X · notes) and 27 more
• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more
• Luna · tool · openai.com · paid
  The other model/agent the classifier routes tasks to; the post doesn't describe it further.
  Also in: GPT-6.1 Sol May Beat Luna for Subagents (Melvin Vivas on X · notes), Picking models for orchestrator and subagent roles in Codex (Melvin Vivas on X · notes), GPT-6 Sol Ultra Subagents Use Up Limits Fast (Melvin Vivas on X · notes), GPT-6 Sol vs Opus 5.5 in a Livestream Comparison (Melvin Vivas on X · notes) and 14 more
• GPT-6 Luna · tool · community.openai.com · paid
  An OpenAI model aimed at fast, high-volume classification and routing.
  Also in: DigitalOcean Serverless Inference Now Serves OpenAI GPT-6 Models (Melvin Vivas on X · notes), DeepSWE results: GPT-6 Sol slightly below GPT-5.6 Sol, but cheaper (Melvin Vivas on X · notes), OpenAI Releases GPT-6 Sol and GPT-6 Luna (Melvin Vivas on X · notes)

Try this

• Fork the codex-astra-luna-orchestrator repo and adapt it into your own orchestrator and subagent setup.
• Build a Codex multi-agent setup where one strong model orchestrates and cheaper or faster subagent models do the work.