Hey d,

I didn't sleep much last night. I was up pushing Sol to fix things that GPT-5.5 couldn't.

I got early access to GPT-5.6 yesterday, and I had agents working on both macOS and iOS apps (and QA tooling). These models are super capable, but they have different strengths and weaknesses.

I had them work on SwiftUI for an iPhone app today.

Watch: GPT-5.6 vs Fable 5: 4 UIs, Judged Blind, 1 Winner

video preview

Can you tell which model made each UI? Hint: one is not like the others.

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P.S. Working on an iOS/macOS app? I do 1:1 App Strategy Sessions.
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