fable51-worlds ships a same-brief head-to-head between Fable 5.1 and GPT-6 Astra, both generating a 3D city entirely as code

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This MIT repo, created 2026-09-02 and at 430 stars, has Fable 5.1 agent swarms take a brief (a sentence, a photo, a clip), research the place, model it, render it and check it, emitting a plain Three.js app with no game engine, no proprietary 3D tiles and no downloaded meshes. Every building, storefront, sign and traffic light is code committed to the repo. The comparison is the interesting part: both models built Union Square from scratch under the same conditions and the Astra world was filmed along the Fable walkthrough's camera route, shown side by side unedited for 59 seconds.