Claude Fable has been incredible, however the plan usage runs out too fast, especially if you use ultracode mode (Claude Code's workflow feature, where the model writes small JavaScript programs that orchestrate subagents) and let the agents go brrr.

I want Fable to focus on high-value tasks such as planning or verification, and not burn tokens on mundane implementation work. So I built ultracodex, an engine that spawns codex agents to complete the same ultracode workflows and hand off seamlessly to and from Claude. It runs the same workflow scripts that Claude writes. I designed this tool for anyone owning both Claude and Codex subscriptions or anyone who enjoys Fable and wants to make the quota last.

This tool is in early days but I am very excited about the potential. I think it’s also a great “loop engineering” starter pack for us because 1) Claude is great at writing loops and 2) ultracodex runs the loops with Codex agents - given their generous limits, you don’t have to worry about usage much. So “loop engineering” is no longer a mysterious thing but a tool you can throw at any task. I have some examples of “loops” in my repo as well.

Project is completely open-source. Apache-2.0, npm i -g ultracodex, demo video in the README.

Please check it out!