Opus 4.6 vs GPT 5.4 (High) prompt: Build a single-file HTML/CSS/JS (no libs) demo that uses SVG to simulate a plant growing: stem extends, leaves sprout + unfurl with springy/windy “physics”, then seamlessly loops forever. For a first impression, I’m really impressed with GPT. Speed-wise, they feel about the same, but GPT’s price is still half of Opus. I also prefer the design and animation generated by GPT. The physics effect on the leaves is super cool, and the looping is really smooth, whereas Opus just fades the plant out. There’s still a ton of tests to run, but this is seriously exciting.