In the last week we’ve had three major model updates: Gemini 3 Pro, Codex Max 5.1, Claude Opus 4.5. We thought we’d give them a challenge:
Build a basic version of Counter Strike. The game had to be a 3D UI and it had to be multiplayer.
If you're curious, pop open (an ideally large computer screen) and you can try out each model's handiwork yourself:
Codex Max 5.1: https://cscodex.vercel.app/ Claude Opus 4.5: https://csclaude.vercel.app/ Gemini 3 Pro: https://csgemini.vercel.app/
We have a full video of us going through the build here , but for those who prefer text, you get this post.
We'll go over some of our high-level impressions on each model, then dive deeper into the performance of specific prompts.
The Setup
We signed up for the highest-tier plan on each model provider and used the defaults set for their CLI. For Codex, that’s 5.1 codex-max on the medium setting. For Claude it’s Opus 4.5. And with Gemini it's 3 pro.
We then gave each model about 7 consecutive prompts. Prompts were divided into two categories:
Frontend: At first agents only having to worry about the game mechanics. Design the scene, the enemies, the logic for shooting, and some sound effects.
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