Stanford student uses Codex to build open-world SF GTA, iterating at studio speed

FinanceYF5 · x · 2026-09-01

A 20-year-old Stanford student used Apple Maps and Codex to create a playable open-world game of San Francisco. Within 24 hours of launch, players logged 16,000 miles and 880+ hours of gameplay, featuring building climbing, car theft, and hang-gliding. The most impressive aspect is the shipping velocity: the developer pushes player-requested features (teleport-to-address, multiplayer, avatar picker) in near real-time based on tweet replies, operating like a full live-service studio.

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