Two frontier models. One proven patch.
/moa is a Claude Code plugin. It gives the same task to Claude Opus 5 and GPT-5.6 in separate sandboxes, has a blind judge pick the better result, applies it, and then proves it actually landed on disk.
Install it in two lines
Paste these into Claude Code. The first run walks you through connecting the GPT-5.6 engine if you don’t have it yet — there is no separate account to make and no API key to paste.
One free run per day. Plans lift the cap.
/plugin marketplace add moamao-frontier/moamao
/plugin install moamaoWhat one run actually does
Two engines, blind
Your task goes to Claude Opus 5 and GPT-5.6 at the same time. Each works in its own isolated git worktree and cannot see the other's output, so you get two genuinely independent attempts rather than one answer and an echo of it. They run concurrently, so a run costs the slower engine's time, not the sum of both.
Judged anonymously
A third agent reads both patches with the authorship stripped and picks on correctness first, then minimalism. It has no tools and no access to your repo — it reads two diffs and returns a verdict. If it fails or times out, the run says so plainly instead of dressing up an arbitrary pick as a review.
Applied, then proved
The winning patch is copied into your repo and every changed file is compared byte-for-byte against what the engine produced. “Applied” is a hash comparison, not an assumption. Anything that cannot be verified is reported as unverified rather than counted as success.
Your work is never at risk
If the patch touches a file you have uncommitted changes in, those bytes are copied somewhere safe before anything is overwritten, and you are told where. If that backup cannot be made, the run refuses to write at all. Losing a patch is an inconvenience; losing your work is not.
Where the compute comes from
Worth being precise about, because it is unusual and it is the reason this is possible at all.
It runs on your machine
Every token of inference happens locally through your own Claude and Codex CLIs, on your own plans. Your prompts, your diffs, and your source never reach our servers.
We don't proxy your account
No OAuth passthrough, no relaying your subscription through a hosted service. The plugin drives the CLIs you already have installed and signed in.
You can read all of it
The whole plugin is a few hundred lines of dependency-free JavaScript on your disk. Nothing is minified, bundled, or obfuscated. Read it before you run it.
Run it on something real.
Install the plugin and give it a task you would otherwise do yourself. The first one is free, and you can read every line of what you just installed.