Re-authenticate the Pi Agent with the New ChatGPT Sign-In

Melvin Vivas · X post · 2026-10-01 · Open on X

Topics: AI Dev Tools & Productivity · Level: beginner

Summary

A quick tip: Pi agent users who sign in through ChatGPT/OpenAI Codex need to re-authenticate with the new ChatGPT sign-in option. The old option is now labeled 'OpenAI Codex (legacy)'.

Key points

• The Pi agent now has a new ChatGPT sign-in option.
• The old auth option is labeled 'OpenAI Codex (legacy)'.
• Re-authenticate with the new sign-in to keep the agent working.

Resources mentioned

• Pi (pi.dev) · tool · pi.dev · free
  Minimal coding agent with four core tools, plus an SDK for adding those tools to your own apps.
  Also in: Coworker: Open-Source Work Agent That Runs on Small Local Models (Melvin Vivas on X · notes), Running Coworker on Free OpenRouter Models and Its Agent Stack (Melvin Vivas on X · notes), Pi Coding Agent: Four Built-In Tools (read, bash, edit, write) (Melvin Vivas on X · notes)
• 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

• Re-authenticate your Pi agent using the new ChatGPT sign-in instead of the 'OpenAI Codex (legacy)' option.