BeckonBench
Measures physics intuition, animation quality, patience with subtlety.
Create a realistic lava lamp simulation as a single self-contained HTML file (no external libraries or assets). Blobs of wax heat up at the bottom, rise, cool at the top, sink, and they deform, merge, and split like real wax — not rigid circles. Get the slow, hypnotic pacing right: it should be mesmerizing to watch for a full minute. It must work by simply opening the file in a browser.
Live artifact. Exactly what the model produced, sandboxed, no network.
| runs first try | 3 |
| polish | 3 |
| prompt adherence | 2 |
| wow factor | 2 |
| total | 10 |
Second straight 10 from the judge. Canvas metaball lamp, self-validated by the model in headless Chrome at 3/15/30/60s checkpoints before it declared done. 56m 41s, ~67.5k output tokens across its planning threads.
57m. 67.5k output tokens.
Live artifact. Exactly what the model produced, sandboxed, no network.
| runs first try | 2 |
| polish | 2 |
| prompt adherence | 1 |
| wow factor | 1 |
| total | 6 |
Judge docked it for the marathon: 68m 55s and 676k output tokens at max effort. Physics-driven wax with a click-to-stir extra and a warm-up fast-forward; finished minutes before an unrelated machine restart.
69m. 676k output tokens.