I have been running my AI coding assistants side by side in one window for a few weeks now: Claude, GPT, Grok, Gemini, and a local model, one lane each. Every file write or command from any of them stops at the same permission card, and I approve or I don't. This week I added the thing I had been doing by hand: letting the lanes pass work to each other.
It is not complicated. I type a question once and send it to all of them. Each answers on its own, without seeing the others. If the answers disagree, I press one key and each model gets the other answers and a short note asking it to respond. If I only want a second opinion on one answer, I quote it into another lane and add my question. In every case the text lands in my composer first, and I press send.
What I get out of it is mostly honesty. One model gives a confident paragraph. Three of them, blind, show me whether the question has one answer or several. Round two is where it pays: the one that was guessing tends to say so, and the ones that were right get more specific about why.
I used to skip these reviews unless the stakes were obvious, because pasting the same paragraph into three terminals and relaying answers back was a chore. Now a review takes me about ninety seconds, so I run them on ordinary changes. In the last ten days that has meant thirteen of them. One caught a write-ordering bug in a change I had already reviewed. One talked me out of building something my own numbers said I did not need yet. Most were smaller than that, and still worth the ninety seconds.
Two practical notes. The lanes run on the vendors' own command-line tools and the subscriptions I already pay for, so there is no separate API bill. And nothing here is hidden between models; every prompt the window builds shows up in the pane as an ordinary turn, so I can scroll back and see who changed their mind and why.
The longer write-up on the window itself is in Five lanes, one window, and the code is public at github.com/cvp1/corral-light. I'll let you know what the next one turns up.