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Codex in Threadlines

A desktop GUI for Codex

Threadlines runs OpenAI's Codex with your ChatGPT sign-in and keeps each thread's plan, subagents, diffs and pull request in view. Add Claude Code to the same thread whenever you want a second opinion.

Download ThreadlinesView the source on GitHub
A Threadlines thread where the user asks GPT-6.1-Sol to check a fix and Sol answers
Ask Codex to check a fix, right in the same thread.

What works with Codex

  • Your ChatGPT plan

    Turns use your plan, and meters show what's left.

  • Goals with budgets

    Give Codex a goal and a token budget.

  • Subagents you can message

    Watch them live and message one while it works.

  • Steer mid-turn

    Codex reads your message in the same turn.

  • Fork and undo

    Fork from any message. Undo rolls Codex back too.

  • Bring in old sessions

    Import threads you started in the Codex CLI.

  • Skills, plugins and MCP

    Manage them all from Settings.

Set up in four steps

  1. 01Download Threadlines
  2. 02Install Codex from Settings › Providers
  3. 03Sign in with ChatGPT or an API key
  4. 04Open a project and start a thread

In every thread

  • Two agents, one thread

    Add a second agent to check the first.

  • Pull requests and CI

    Review them beside the chat.

  • Built-in browser

    Preview your site and attach a screenshot.

  • A worktree per thread

    Keep each agent's changes apart.

Questions

Is Threadlines OpenAI's Codex app?

No. OpenAI's own Codex app is now part of the ChatGPT desktop app. Threadlines is a separate, free and open-source app that runs the Codex CLI with your ChatGPT sign-in, and can put Claude Code or another agent in the same thread.

Can I run Codex on my other computers?

Yes. Link your Mac, a Windows PC or a Linux box, and Fleet shows what Codex is doing on each. An agent on one computer can start a thread on another when it needs that machine, after asking you first unless you allow it.

Does Threadlines use my ChatGPT subscription?

Yes. It runs the Codex CLI with your ChatGPT sign-in, so it uses the same limits as Codex anywhere else. An OpenAI API key works too, and that bills per token.

Can I move a Codex thread to Claude Code?

Yes. Switch the thread's agent and Threadlines gives Claude Code a recap of the conversation along with your current working tree. Or keep Codex and add Claude Code to the same thread.

What does it cost?

Threadlines is free and MIT-licensed. You only pay for your ChatGPT plan or API usage.

Other agents

Codex is made by OpenAI. Threadlines is an independent open-source project and isn't affiliated with or endorsed by OpenAI.