Same game built twice: Opus alone vs Opus planning + local Qwen coding. 16 min vs 42 min, $2.52 vs $0.62

Using Atomic Agent's Fusion mode, offloading code generation from Claude 3.5 Opus to a local Qwen 2.5 27B model reduced cloud costs by 75% for a pixel platformer build. While build time increased from 16 to 42 minutes due to local GPU resource sharing, Opus output tokens dropped from 90.7k to 11.3k with near-identical task completion.