The Useful Stack
AI model vs AI model, same prompt, real results. The Useful Stack builds games and tools with Claude, GPT and other AI models, then publishes the unedited first result so you can play it and judge for yourself.
Four free browser games are here: Veld vs Tessera Wilds (voxel sandboxes) and Quayshift vs Scramble Yard (endless runners). Every game page links to the build video and to its source-and-guide.
A 3D endless runner Claude Opus 5.5 built from one prompt. Play the real, unedited result.
Action
Play in browser
A 3D endless runner GPT-6.1 Sol built from one prompt. Play the real, unedited result.
Action
Play in browser
A voxel survival sandbox Claude Opus 5.5 built from one prompt. Play the real, unedited result.
Survival
Play in browser
A voxel sandbox GPT-6.1 Sol built from one prompt. Play the real, unedited result.
Simulation
Play in browser