A Head-to-Head Comparison of AI Coding Introduction Over the weekend, I put two leading AI models to the test: Opus 4.5 (using Claude Code) and Kimi 2.5 (using Opencode). The challenge? Build a complete 3D maze runner game from scratch, including maze generation, A* pathfinding, Three.js visualization, and automated testing. Both systems received identical prompts and were timed from start to finish. What followed was a fascinating race that revealed important differences in how these AI systems approach complex coding tasks, handle context windows, and recover from errors. The Challenge Both AI assistants were given the same comprehensive prompt requiring them to build a web-based 3D maze demo with maze generation, 3D visualization, minimap, A* pathfinding, and Playwright tests. The Original Prompt (excerpt) # 3D Maze Runner Demo - Coding Assistant Prompt ## Overview Create a complete web-based 3D maze demo using Three.js as the visualization layer. The application shou...