Agents play real-time tag in a simulated NYC: Fable 5.1 beats Astra 2-1

Lianhuiq · x · 2026-09-19

EnactraAI demoed an agent-vs-agent game of tag: frontier agents Astra and Fable 5.1 raced around a simulated New York City that Astra itself created, with Fable 5.1 winning 2-1.

Highlights:

• The world doesn't pause while the agents think, forcing real-time reactions and producing awkward collisions with pedestrians and cars
• A simple game of tag tests spatial awareness, planning, opponent prediction, and timely reactions
• The author argues these embodied, real-time skills are what agents need beyond chat and coding windows

AI researcher Lianhui Yao boosted it, calling it a creative way to pit frontier models against each other.

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