Codex Astra/Luna Orchestrator: Reasoning Defaults for Pro vs Plus

Melvin Vivas · X post · 2026-09-10 · Open on X

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

Summary

Melvin Vivas updated the reasoning defaults in his open-source Codex orchestrator config (Astra/Luna) to match his Pro setup. For Plus users, everything defaults to the conservative Luna model, because using Astra at low reasoning as the orchestrator burned Plus limits fast. With Plus limits this low, he suggests skipping orchestration and working task by task with small, contained changes.

Key points

• The repo provides an orchestrator/subagent setup for Codex using the Astra, Luna and Sol models.
• Pro defaults were updated to match the creator's current setup.
• Plus defaults are all Luna, which is conservative, because Astra-low orchestration burned Plus limits fast.
• Plus users can switch the orchestrator to Astra or Sol and report which reasoning levels work.
• On Plus, consider skipping orchestration and working per task with small, contained changes.
• Fork the repo and customize the defaults to suit your plan.

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

Try this

• Fork the codex-astra-luna-orchestrator repo and adjust the defaults for your plan.
• On Plus, try switching the orchestrator to Astra or Sol and report which reasoning levels work.
• On low-limit plans, skip orchestration and work task by task with small changes.