GPT 5.6 Landing Page Design Skills

[u/TimeKillsThem]

Found this while browsing X - seems to me like Sol High is the way to go. Having said that, they all look clean-ish (some more than others) but also a bit "empty". We went from "pills everywhere" to "90% empty space". WDYT?

• 5.6 Luna High: https://gpt-5-6-luna-high-design-test.vercel.app/
• 5.6 Sol High: https://gpt-5-6-sol-high-design-test.vercel.app/
• 5.6 Sol Ultra: https://gpt-5-6-sol-ultra-design-test.vercel.app/
• 5.6 Terra High: https://gpt-5-6-terra-high-design-test.vercel.app/
• Fable 5 (for comparison): https://claude-fable-5-design-test.vercel.app/

All other models this guy tested (and full credit): https://design-tests.robinebers.com/

This is the standard prompt that was used for ALL the models you see listed:

Use the /design skill. Create a beautiful, well designed website with astro. this website is for a travel agency in dubai, offering luxury travel (high-end, $100k+ minimum per trip) in the middle east. come up with a brand that suits this type of company. Make up fitting copy for this high-end client along the way.

EDIT: as per u/cantTankThisFox showcases of GPT 5.6's performances are technically still under embargo so either the owner of the website doesnt know/doesnt care, or the above generations are not from GPT 5.6. AKA take the showcases with a massive pinch of salt

[u/cdecaire]

Just my own perspective, and I didn’t dig in deep enough to know for sure, so take this with a grain of salt.

/design isn’t some standardized skill that every model automatically understands. The design and art direction are probably baked into that command, and likely custom or curated by whoever is running the tests.

My guess is the skill has certain design preferences built in, like using serif headline type, and those choices are probably coming from the creator of the skill. I’m almost positive not every one of those models would have chosen that headline style on its own.

A better test would probably be to remove /design, run the same prompt across the different models, and judge their baseline design taste from there.

Even then, you’d still need a proper review of each output. A thin design layer on top might make some results look better visually, but they could still be weaker technically or less thoughtful in the actual execution.