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Claude Fable 5 Generates a 3D Metro Map From a Single Prompt

July 7, 2026 at 14:45 EDT

Foundation Models
Media Generation
Software Dev & Coding

Anthropic's top-tier model Claude Fable 5 has been shown generating an interactive 3D metro map from a single text prompt, drawing attention among developers. The output is a single, self-contained HTML file with embedded Three.js that requires no outbound network requests and runs directly in the browser.

June 9, 2026 · Anthropic

One Prompt, a Whole 3D City: Claude Fable 5 Builds Interactive Metro Maps

A Mythos-class model that spins up browser-based transit simulators — animated stations, live passengers, fly-to search — from a single natural-language instruction, pairing Three.js with MapLibre GL JS.

prompt to a full interactive 3D app

46,000

buildings in the Manhattan 3D map

120+

stations in the Delhi Metro build

The cost of one 3D app, drawn to scale

Token consumption for a single generated app can run from a few million to over 20 million — the headline constraint on API spend.

~1M

simple build

20M+

complex 3D world

Up to ~20× more tokens — long-horizon tasks may stall and need repeated iteration.

What people are building — from one prompt

Pune Metro 3D

Animated stations, glowing lines, search and fly-to navigation

Delhi Metro

120+ stations, ride or drive trains, live passengers, weather, announcements

Paris Metro

Open-data based, 2D/3D layers, statistics display

Namma Metro (Bengaluru)

Elevated tracks, accurate station placement, walkable

Manhattan

3D map including 46,000 buildings

The upside

"Vibe coding" wins praise — high-quality, large-scale 3D worlds generated in one shot from vague instructions, with no specialized 3D development expertise required.

The catch

Very high token consumption drives up API costs, and long-horizon generation can stall — forcing repeated iterations to reach a finished app.

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