First impressions of Fable 5 and the racing game I built with it

My first impressions of Fable 5 before it was suspended.

Best way to use Fable 5 is to start with /goal in Claude Code. Tell it what you want as clearly as you can. Give it necessary context, tech stack if you have preference (like me), ask it to interview you for design decision and then let it build it for you.

Once /goal command is run and requirements are clarified, then Fable 5 ran continuously for more than 30 minutes before returning with the final product. In my case, I had to run it few more iterations to build the game to suit my design goals.

One new thing, I observed, is how good the verification of the goal has become. It has created separate directory for writing test code, taking screenshots of the game, verifying it and improving the game. All part of the goal. When I denied it access to .npm directory from my /home/user, it built a full testing framework in python and took screenshots. Wish it used my existing playwright mcp skill or playwright cli for this job. Will add it to my SKILL.md next time.

Fable 5 is good and in my brief use of this model, it is a better version of Opus 4.8. After it was blocked today morning, added fly-by shots to add in the intro scene of the game using Opus 4.8 and it did a fine job. Didn't miss Fable 5. This is a small usecase and Fable 5 might be an overkill.

At this point, I believe, Agent Harness matters more than the model itself for 90% of the tasks you do.

Created retro-racer game using three.js, HTML5/CSS/JS and open-source GLB car models. Runs fully client-side in your browser :) Spent few hours fine tuning and redesigning it. So, you might feel it is not retro anymore given the latest iteration using Claude Design.

Here is the video of the game. Link to the game below the video.