The exact same prompt, sent live to three frontier models. Kimi K3 just topped this exact category of test on LMArena — here it is, running in front of you, so you can judge it yourself instead of taking a leaderboard's word for it.
Kimi K3 1679 Elo
Claude Opus 4.8 — ranks below all three
GPT-5.6 Sol 1618 Elo
The prompt — sent verbatim to all three
Write a single self-contained HTML file (inline CSS and JS, no external libraries) that renders a full-screen animated particle flow field reacting to mouse movement. At least 500 particles, smooth easing, a cohesive color palette, and it should run at a comfortable frame rate. Return ONLY the code, nothing else.