To test Opus 5.5, @TylerNishida gave Claude a one-sentence prompt: Build a Genshin Impact–style game set in San Francisco. It came up with the details on its own, including $4,200 rent, a sourdough sword, and a special move called “Series Z,” in which the main character raises $40 million. Tyler demos the result in our latest livestream. Read our Opus 5.5 Vibe…