Opus 5.5 vs GPT6 Astra - Who builds a better html prototype?
19.5K views · 2026-09-23
UI DesignIndustrial Design
Claude Opus 5.5 just launched, so I tested it against GPT-6 Astra on the kind of work I actually do: an HTML website prototype.
I gave Claude and Codex the same brief for a Dutch solar installer. Both had to build a clean website with a 3D house, solar panel controls, calculations, and a quote page. I also gave them my design principles and CSS framework, and skipped image generation to keep the test fair.
Claude finished in about 40 minutes and Codex in about 30. Both results were useful, and both followed the brief closely. I walk through the 3D interactions, design choices, copy, limitations, and usage on my $100 plans.
Neither prototype is a finished website. The sun positioning needs work, and a quote form still needs a real way to capture the data. But this was a useful test of what these models can do with a detailed brief.
Which one would you use for this kind of project?
My other video about the 3D Mountain I created with GPT6 Astra: https://youtu.be/xJpJ7nLGKk0
→ Software I recommend
Hostinger for webhosting: http://livingwithpixels.com/hostinger
Elementor for no-code web-development: http://livingwithpixels.com/elementor
Elementor Add-on for dynamic content: http://livingwithpixels.com/crocoblock
Figma for Web Design: https://livingwithpixels.com/figma
All recommended software & discounts: https://livingwithpixels.com/links/
→ Full A-Z Courses
Elementor Pro Mastery Course: https://livingwithpixels.com/elementor-course
Figma Design Mastery Course: https://livingwithpixels.com/design-course
Business Course: https://livingwithpixels.com/business-course
→ Social media
Tiktok: https://www.tiktok.com/@rinodeboer
Instagram: https://www.instagram.com/rinodeboer/
Twitter / X: https://www.twitter.com/rinodeboer/
Some of the links above are affiliate links, which means that I earn a commission when you make a purchase via my link. Thanks a lot if you decide to do that! I couldn't make all these videos without it.
I gave Claude and Codex the same brief for a Dutch solar installer. Both had to build a clean website with a 3D house, solar panel controls, calculations, and a quote page. I also gave them my design principles and CSS framework, and skipped image generation to keep the test fair.
Claude finished in about 40 minutes and Codex in about 30. Both results were useful, and both followed the brief closely. I walk through the 3D interactions, design choices, copy, limitations, and usage on my $100 plans.
Neither prototype is a finished website. The sun positioning needs work, and a quote form still needs a real way to capture the data. But this was a useful test of what these models can do with a detailed brief.
Which one would you use for this kind of project?
My other video about the 3D Mountain I created with GPT6 Astra: https://youtu.be/xJpJ7nLGKk0
→ Software I recommend
Hostinger for webhosting: http://livingwithpixels.com/hostinger
Elementor for no-code web-development: http://livingwithpixels.com/elementor
Elementor Add-on for dynamic content: http://livingwithpixels.com/crocoblock
Figma for Web Design: https://livingwithpixels.com/figma
All recommended software & discounts: https://livingwithpixels.com/links/
→ Full A-Z Courses
Elementor Pro Mastery Course: https://livingwithpixels.com/elementor-course
Figma Design Mastery Course: https://livingwithpixels.com/design-course
Business Course: https://livingwithpixels.com/business-course
→ Social media
Tiktok: https://www.tiktok.com/@rinodeboer
Instagram: https://www.instagram.com/rinodeboer/
Twitter / X: https://www.twitter.com/rinodeboer/
Some of the links above are affiliate links, which means that I earn a commission when you make a purchase via my link. Thanks a lot if you decide to do that! I couldn't make all these videos without it.