Gave DeepSeek V4.1 Flash, Opus 5.5, GPT-6 Astra and Grok 4.7 the same game prompt. Can you tell which one is Flash?

Same one-shot prompt, 4 agents, each in its own sandbox with the same tools. No skills, no follow-up turns, no cherry-picking: this is the first and only run of each. Prompt: Build a playable 3D flying game in the browser (Three.js): pilot a paper plane through floating islands at golden hour. Soft volumetric clouds, waterfalls spilling off the islands, flocks of birds, glowing rings to fly through, wind trails, a cinematic intro fly-by and a score. Hand-painted storybook look, gorgeous from the first frame. The video is 20 s of each one with the same scripted key presses, so the flying is clumsy. That's the bot, not the games. Guess A/B/C/D before you open the answer in the comments. What surprised me: Flash spent the longest of the four and used ~4x Opus's input tokens, re-running and fixing its build over and over. One run each, so take it as one data point, not a benchmark. Ran in mid-October, so this is V4.1 Flash before the 1017 update.