Ran FlappyBench on DeepSeek V4.1-Flash, GLM 5.3, and Kimi K3 with the same /design prompt.
- DSV4.1-Flash: 9/10 · $0.0089 one-shot with the lowest cost
- GLM-5.3: 9.5/10 · $0.0184 · nailed the UI but cost 2x more
- Kimi K3: 8/10 · $0.0740 · hard-coded gameplay and 8x more
Our engineering and design team has been testing 26+ 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/flappy-bird
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