A 3D Rick Sanchez built from code alone: Claude Fable 5.1 vs GPT-6 Astra

One brief to two AI agents: build a 3D Rick Sanchez out of nothing but code. No model files, no images, no textures. The spiky blue-grey hair, the unibrow, the lab coat over the blue shirt, the drool and the flask, all from shapes each model wrote itself, turning on a turntable in one HTML file.

Claude Fable 5.1 ran in Claude Code, GPT-6 Astra in Codex CLI. One attempt each, no retries. In the reel both figures turn exactly once, so you are comparing the models and not the turntable speeds.

Fable lit a single figure on a dark background, with the flask, the drool and the blue shirt, and let the model carry the frame. Astra put its figure on a turntable inside an 'interdimensional archive' card, C-137 in the corner. Both are recognisable, and neither loaded an asset.

Fable billed $2.99 over about 7 minutes. Astra billed $0.62 in under 3. They ran in different tools, so part of that gap is the tool and not the model.