GPT-6.1 Sol in Codex Is Efficient Enough to Downgrade Plans

Melvin Vivas · X post · 2026-09-30 · Open on X

Topics: AI Dev Tools & Productivity, LLMOps, Deployment & Monitoring · Level: beginner

Summary

The creator praises how efficient GPT-6.1 Sol is in Codex. He says it might be good enough that he no longer needs the $200 Pro plan, which suggests rechecking your subscription tier when new models launch.

Key points

• GPT-6.1 Sol is very efficient when used in Codex.
• Better efficiency may mean you no longer need the $200/month Pro plan.
• When a new model comes out, check whether a cheaper plan now covers your coding needs.

Resources mentioned

• GPT-6.1 Sol · tool · openai.com · paid
  A new OpenAI model announced at DevDay 2026 (name as written in the machine transcript), offered with Fast and Ultra fast speed tiers.
  Also in: JevDev: Open-Source UI Tool for Experimenting with Jev (Typesafe.ai) (Melvin Vivas on X · notes), Comparing Coding Models on the Same Task in Devin iOS (Melvin Vivas on X · notes), 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) and 9 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
• ChatGPT Pro · tool · help.openai.com · paid
  OpenAI's $200/month subscription plan.

Try this

• Check whether GPT-6.1 Sol in Codex lets you move to a cheaper plan.