One-shot Fable 5.5 prompt yields 1000-line three-body sim in Bend: 60 FPS, 4 formally proven laws
sprooos · x · 2026-10-02
- A one-shot prompt to Fable 5.5 produced 1000 lines of Bend implementing a live three-body simulation: physics on the CPU, every pixel of every frame computed on the GPU, hitting 60 FPS at 1280×720 on an Apple M5.
- The program ships with 4 laws that are formally proven, not just tested. Code is open-sourced on GitHub (AdrielSantana/three-bodies).
- The repo includes 8 orbital scenarios, supports Metal on macOS and CUDA 12 on Linux, plus flags like --gpu off and --threads for CPU-parallel comparison. Requires Bend 2.0.34+ and clang 19+.
- The poster coined PEBCAM (problem exists between chair and model) — the model's capability outpaced expectations; the bottleneck is the human.
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