Opus 5.5Launch week

Letters Abroad, redesigned for iPhone Duo

Opus ran for 14 hours on a language-learning app, redesigned it for every iPhone Duo mode and made its own over-the-top demo video.

@anshuc 671

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As reported by the creator. Blank means not reported.

Build time
14 hours
Model
Opus 5.5
Category
Apps & websites
Filed
Sep 25, 2026
On X
67122

From the post

I'm stunned. I told Opus 5.5 to update my app for iPhone Duo, however it wants, and send me a cool demo It ran for 14 hours, redesigned the app to look great in every mode, and made this completely over-the-top video …for 9% quota https://t.co/U14J3SvHKJ https://t.co/jZ7lBKnt6M
Forget threejs demos, Opus 5.5 is *incredible* at building apps. This is Letters Abroad, a language-learning app I'm working on. You exchange letters with an AI pen pal, and learn a language through context (plus some brain science magic). https://t.co/9ZP7vm0Ywp (also built by Opus, of course) I've been tinkering with this the last week. I built a prototype with Astra, but wasn't happy with the design. Tried Fable, still wasn't good enough. Then Opus 5.5 dropped. In a few hours, I've made more progress on the visuals than in a week of burning tokens. This model is insane. It reads my mind and nails it every time. All the gorgeous 3D models and fluid transitions are thanks to Opus. Crazy idea, prompt, repeat. No more quota anxiety, just non-stop flow state. I'll be writing about my prompts/skills/learnings from building this. Lots to share; this generation of models is absolutely game-changing for design!

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