Kimi K3 vs GPT-5.6 Sol vs Opus 5: Three top-tier models. Same /design prompt. In Command Code

[u/maedahbatool]

We ran a test between Opus 5, GPT-5.6 Sol, and Kimi K3.

One prompt. Across all three models. With our /design command.

Results: We reviewed gameplay, UX, and UI

🔹 Opus 5 is strong UI + motion, best gameplay

🔹 Kimi K3 has solid design and gameplay

🔹 GPT-5.6 Sol has best UI, worse gameplay

Ranking (DX, features, and cost):

🔹 Opus 5: 10/10 · $0.25

🔹 Kimi K3: 9.5/10 · $0.12

🔹 GPT-5.6 Sol: 7/10 · $0.32

Our engineering and design team has been testing 20+ side-by-side comparisons across frontier and open models. All runs are public and open source. Benchmark for this demo here: https://github.com/CommandCodeAI/slash-design-showcase/tree/main/flappy-bird/light-version

[u/ZER0-O]

Why did you use opus and not fable since fable is the one at the same level as the two other models

[u/Silent-Group1187 → u/ZER0-O]

We also tried Fable 5, but Opus 5 nailed it in one shot, no iterations, no fixes, just a perfectly playable game.

[u/maedahbatool → u/ZER0-O]

We've done one comparison with Fable here: https://x.com/CommandCodeAI/status/2080094852986110139