It was no secret that Anthropic had an advanced model in the world. Claude Fable 5 was released just yesterday, and it is already breaking the internet. For starters, it leads the chart in almost every area that matters, by a lot. It has already set a new speed run record for Pokemon game along AI models (50 hours).
Claude Fable 5 sets a new speed run record for Pokemon game among AI models — 50 hours
Previous models got stuck for thousands of hours — this one just ‘looked’ at the screen and played like a human pic.twitter.com/kLKBpKRknn
— RT (@RT_com) June 10, 2026
So what can you do with it? You can ask it to build you a Windows OS clone that runs in browser.
Asked Claude Fable 5 to build a Windows OS and it built a fully functional web-based Windows OS clone in the browser – sign-in, notifications, Edge, Solitaire, the works. Plus, even created Copilot lol, A Minecraft clones, vision-based gameplay, insane 3D worlds & more.
Full… pic.twitter.com/n3dX4fiGMY
— WorldofAI (@intheworldofai) June 10, 2026
Users have already gotten it to clone GTA 6, Monopoly, and a city block simulator with multi-agent traffic, live detection boxes + tracks, and day to night cycle. Someone even managed to get it to clone Replit.
I am in disbelief…
Claude Fable (Mythos) one shot Replit
(A Mobile app that builds Web Apps)Prompt was basically:
“build an app like Replit, that uses @daytonaio for sandboxing, and convex for DB”> Builds Apps
> Preview App
> Open in Browser
> Edit apphahaha wow…. pic.twitter.com/cssFJoT7JF
— Riley Brown (@rileybrown) June 10, 2026
