codex-fractal

Adding an automagical way for Codex to smartly parallelize work out into not only sub-agents but also additional full agents (tasks/threads) with built-in auto routing for model and reasoning level

Comment

Inspiration

I spent a lot of time working with Codex, and after GPT-5.6 Ultra was available, I could see the obvious future of a lot more parallelization into sub-agents. I noticed the distinct gap that there was no ability to break this out into other full agents.

What it does

Fractal provides smart parallelization, routing, and orchestration to take what you need to do and break it down into smaller pieces that can be handled in a variety of ways at a variety of levels of intelligence.

How we built it

I used SOL 5.6 Ultra for at least 85% of the project, and still resources started getting thin. Then I started using Terra a bit more and also started dabbling into Claude Code, if I'm being honest.

Challenges we ran into

I had originally tried building this out into an MCP server with the UI portion as well, but it seemed there are still pieces missing from the app server in order to really get the functionality I wanted out of the Codex app side.

Accomplishments that we're proud of

I'm really happy that this seems to be something that, to me, feels like an obvious next step but also isn't available in the Codex app and overall experience yet. When I first saw the web created, and the threads renamed, and the intelligence and model names all working as I expected, it definitely felt awesome.

What we learned

I think I have a lot more work to do in terms of building things more efficiently, choosing the right models and intelligence levels, and really getting a lot more diverse stack of combinations. I think this tool that I just built is going to help a lot for that.

What's next for codex-fractal

I'm gonna continue working on this because I think it's gonna be really helpful in the way that I work. I build with the Codex app all the time, and I think it's really opening the door for tapping into more of the app server functionality in general. Not only things that I could leverage in the Codex app, but also leverage across distributed projects. I'm really hoping to add more users, friends, and people I work with to help me dogfood and build this out even further.

Built With

Share this project:

Updates