It is no secret that Anthropic’s Fable 5 model is amazing at coding. Opus 5 is not that much behind. You will just need the right kind of prompt to generate amazing apps and games with it. Here is an amazing prompt that creates a Call of Duty type game with Opus 5:
I want you to build a first-person shooter at the level of the most recent Call of Duty games. It should be utterly perfect, visually beautiful, with every single thing done at AAA quality—from textures to physics to anything you could think of.
Fan out sub-agents and have sub-agents tackle each one individually so that the game is utterly perfect. You should /loop on each item and have a separate sub-agent check it visually to ensure it looks triple A. That separate sub-agent should be a really harsh critic, and if it doesn’t look triple A, it should keep going.
Don’t stop until each sub-agent is utterly wowed with the quality when compared with the actual Call of Duty game. It should literally compare them side by side blind and say which one looks better. Do this in ThreeJS. /loop until it’s utterly perfect. Fan out sub-agents and ultracode.
Matt Shumer is the developer behind this:
Claude Opus 5 one-shotted this game.
EVERYTHING you see in this demo is custom code… not a single external asset was used.
AI games are going to be amazing.
(sound on) pic.twitter.com/zc7C61kgv1
— Matt Shumer (@mattshumer_) July 25, 2026
