Same Prompt, Two Eras: GPT-5.5 vs Claude Sonnet 4 Flappy Bird Test Shows 1.5 Years of LLM Gains
Dhakkad_Mutthal · reddit · 2026-09-29
A Reddit user ran the same detailed Flappy Bird prompt through GPT-5.5 and Claude Sonnet 4 (both medium effort, free plans) to benchmark how far LLMs have come.
- The prompt demands a complete game: 2D background, tap-to-flap physics, scrolling pipes, scoring, sound effects, cartoon art, top score, and a start animation
- Full prompt included, so anyone can reproduce the comparison
- Takeaway: the models' code generation has made remarkable progress in just 1.5 years
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