That's fair enough.

For mobile apps, I find that nowadays with Opus 5.5 the UI looks better, the UX is better, it can implement more tricky animations and gestures, and it can do all of that with far fewer iterations and feedback than eg. GPT 5.5 would have required.

Also vision capabilities were improved significantly with GPT 6 Astra or Opus 5.5, even compared to GPT 5.6 Sol.

There was no way the old models such as GPT 5.4 would have done a comparable job when asked to align an implementation to a visual reference.

Even for basic websites with no interactive functionality, this should make a significant difference.