Image: Vesta Arcade · Bot Defense, one of the browser games in the blind model comparison
Three browser games built for a blind Claude–Gemini comparison
The maker gave Claude and Gemini identical prompts for three browser games, then built an arena where players compare them without seeing the model names.
Credits
- Build author AngelUsurper Source ↗
Earliest dated source: Details reviewed:
The full story
The maker asked Claude Opus 5.5 and Gemini 3.8 Flash to each build an endless runner, a server-defence game and a keyboard-walking cat game. Each received the same prompt file, one attempt and no human edits.
Players try two versions of a game and vote before learning which model made each one. The maker reports that Claude tested its server-defence game with a simulated player and adjusted difficulty after the test ran much longer than the requested play time. The arena runs on the maker’s Vesta arcade, itself built with Claude Code.
What Claude did
Steal the prompt
How it was done
Tools
Themes
Loading themes…
Sources
From a short post by the maker, so the details are as they tell them.
- Reddit: Three browser games built for a blind Claude–Gemini comparison
The maker's Reddit post describing the project and reported results.
- The project: vestapowered.in
Linked in the post.