OP5 will do long running work, you just have to make it write a plan.

And - trick - give it a little cli so it can run Codex if you have them both.

Let it do codex to do the bulk of the work, get a OP5 sub-agent to audit the work of the codex worker.

Just let Op5 manage and have 'specific oversight.

You can run for 2 days on 1 context window in the manager, the advantage is that it will stick to a broad plan.