Claude Code vs Codex vs DeepSeek Harness. Same three.js night scene, one run each.
Claude Code (Fable 5.1): 4:54 · $2.05
Codex (GPT-6 Astra): 1:52 · $0.55
DeepSeek Harness (V4.1 Flash): $0.14, about 1/15 of Fable's cost, but 22:42, the slowest by far