Two days after Anthropic shipped Claude Fable 5.1, fable51-worlds (PhiloLabs) hit the HN front page with 248 points. It’s an open-source agent project: a swarm of fully autonomous Fable 5.1 agents researches a real place, models it, quality-checks itself, and ships a walkable Three.js world that runs in any browser. No game engine, no human… Continue reading