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ComparisonsVib3Coded @vib3coded2026-10-110:18

Interactive plush penguin model comparison

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The creator used the same detailed text prompt to have Claude Opus 5.5 and GPT-6 Astra each build a single-file WebGPU interactive plush penguin with soft-body physics and brushable fur, then compared the results and API costs.

Full prompt1,984 chars

Build a single-file WebGPU "material study" page called "Plush Penguin": editorial studio layout, large italic serif title "Plush / Penguin.", kicker "Material Studies / No. 016", caption "A fluffy egg on two felt feet. It waddles, it toboggans, it falls over — and always gets back up.", live status chip, specimen panel on the right, stats row (Mass, Volume, Steps, Slide in cm), collapsible "Inside the experiment" notes. UI in English, works on mobile.

The toy: a round plush penguin chick — an egg-shaped stuffed body as one SDF meshed with surface nets, a dark cap and back, a pale fluffy face and belly, big glossy safety-glass eyes, a small felt beak, pink cheeks, two flat felt feet. Its flippers are separate cloth pieces (particle cloth sewn to points embedded in the body) that flop, flap and stretch.

Physics: XPBD soft body on a hex lattice (shape-matched cells + tetrahedral volume preservation, live volume readout), skinned to the mesh, standing on a table with Coulomb friction. Locomotion by posture: a weak pull of the whole body toward its rest shape turned to an orientation and carried with its centre of mass, so the stuffing does the moving. Behaviours: Waddle (rocks side to side, lifting each foot and setting it down ahead), Belly slide (a little hop, flops forward onto its tummy and toboggans across the table, then rocks back up), Flap (happy flapping and a couple of hops), Topple (falls onto its back, belly or side and rocks itself upright with an overshoot), Smooth fur, Reset. Finger: it waddles over to your finger; push it and it falls over. Hand: pick it up, squash it, pull a flipper and it comes along.

Fur: real-time shell fur with alpha-to-coverage — long fluffy down on the body, short on the face, combable with a Comb tool (against the grain darker, with it shinier). Sliders: Stuffing, Pile (mm), Table (felt ↔ ice friction, so it slides further on ice). Palettes: Chick, Classic, Little blue. ¼ speed and mesh toggles, Pause. 60 fps.

Source: the creator's reply under the post. Kept in its original language, unedited.

Tools the creator mentioned

WebGPUGPT-6 Astra

Original post: https://x.com/vib3coded/status/2109288662319919127

All works are open data at GitHub · awesome-opus-5.5-video.

Model attribution is as stated by the creator and was not independently reproduced. View counts are a snapshot from 2026-10-12. The work belongs to its creator; DM @GoSailGlobal on X for corrections or removal.

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