GLM 5.3 vs Fable 5 vs GPT-5.6 Sol on FlappyBench

Tested FlappyBench with GLM 5.3, Fable 5 and GPT-5.6 Sol. 3 models. Same prompt with /design command. Scored on features, UX/UI, and cost.

• Fable 5 → 9.5/10 · $0.420
• GLM 5.3 → 9/10 · $0.018
• GPT-5.6 Sol → 9/10 · $0.150

Results:

• Fable 5 wins on quality, but costs 23x more than GLM 5.3
• GLM 5.3 gives better output than GPT 5.6 Sol at 8x cheaper
• Optimizing for cost? Go for GLM 5.3. Otherwise, Fable 5 if quality matters

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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