Replicating Fable with Opus: How a One-Line Prompt Built a 3D Game (and What It Taught Us About Prompting)
We asked Fable 5 to build a detailed 3D medieval survival RTS in one shot. Ninety minutes later we had an 11,826-line game — and a surprise: 94% of it was written by Sonnet, not Fable. Here is how the magic actually works, and how we replicated it with Opus.