Fable 5 vs GPT-5.6 Sol vs Kimi K3: an endless runner

We ran a test between Fable 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

• Kimi K3 performed well across all three.
• Fable 5 is good, but its UI doesn’t look much better.
• GPT-5.6 Sol has the best UI, but the gameplay is worse.

Ranking (DX, features, and cost):

• Kimi K3: 9.5/10 · $0.12
• Fable 5: 9/10 · $0.60
• 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: github.com/CommandCodeAI/slash-design-showcase/tree/main/subway-surfers

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