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GPT-6 Astra Project Turns Seoul Into an Interactive 3D Web Atlas in Under 44 Minutes

September 17, 2026 at 09:46 EDT

Foundation Models
Software Dev & Coding
Media Generation

A developer-built demo attributed to OpenAI's GPT-6 Astra has turned Seoul into an interactive browser-based 3D atlas, with all 25 districts, roughly 267,000 simplified buildings, day and night controls, and a landmark fly-through assembled in a reported 43 minutes and 38 seconds. The project is drawing attention because it shows a frontier model being used not just to generate a visual asset, but to process public geospatial data, build a Three.js scene, add controls, and deploy a usable web experience.

Sep. 2026 · GPT-6 Astra

Seoul, rendered as a browser city

An Astra-assisted project turned public map data into an interactive Three.js atlas of Seoul, covering all 25 districts and about 267,000 simplified buildings.

The scale of the build

Seoul districts

267,000

simplified buildings

43m 38s

reported build time

landmark fly-throughs

25 districts, shown to scale

25districts

14landmarks

Each orange segment represents one district; purple segments group the landmark fly-through count.

Data pipeline

Public map data became simplified 3D geometry.

Interactive layer

Rotate, zoom, drag, mobile touch, and fly-through controls.

Accuracy limit

Some heights are estimated; the result is not a survey-grade model.

What the demo really shows

The notable shift is workflow speed: a model-assisted build turned geospatial data, rendering code, interface controls, and deployment into a usable prototype. The result is impressive as a web visualization, but its own disclosures keep it in the category of stylized atlas, not authoritative mapping.

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