Single Agent vs Subagents in Codex: Trying Astra Only

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 plans to work a full day in Codex using only the Astra model, with no subagents. Other users report this works better, and someone at OpenAI reportedly discouraged subagents. The open question is whether usage limits will last with a single strong agent.

Key points

• Experiment: use only Astra in Codex for a full day, with no subagent orchestration.
• Community reports say a single strong model can do better than an orchestrator + subagents setup.
• A post from someone at OpenAI reportedly discouraged subagents in favor of Astra alone.
• The main risk is that usage limits run out with a single high-capability model.

Resources mentioned

• 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
• GPT-6 Astra · tool · openai.com · paid
  The model announced in the quoted launch post, pitched as the developer's most capable model for work, coding, science and cybersecurity, and able to operate a computer.
  Also in: Customizing Your Coding Setup with Pi Coding Agent Extensions (Melvin Vivas on X · notes), Pi Agent Council: Ask Multiple LLMs in Parallel and Compare Their Advice (Melvin Vivas on X · notes), Use GPT-6.1 Sol by Default, Save Astra for Emergencies (Melvin Vivas on X · notes), Dots in ChatGPT: always-on AI agents that you hand responsibilities to (Melvin Vivas on X · notes) and 49 more

Try this

• Compare a single-agent workflow with an orchestrator + subagents setup on your own tasks, tracking quality and usage.