GPT-6.1 Sol vs Opus 5.5 Physics Truck Game
Can an AI agent build a real physics vehicle? Claude Opus 5.5 in Claude Code and GPT-6.1 Sol in Codex got the same prompt and the same reference picture: an off-road hill climb in Godot, with a truck that has to be a real physics body on working suspension. No downloaded or generated 3D models. Both worked inside Flockbay over MCP, pressed Play themselves, and decided when they were done. Source:…
Two AI models, Claude Opus 5.5 and GPT-6.1 Sol, competed to create a realistic off-road hill climb game in Godot using only code. Both models received the same prompt and reference image, tasked with building a physics-driven truck with suspension that could navigate a trail, bridge, and jump, all while being driven by the models themselves.
Claude Opus 5.5 took 31 minutes to complete the game, while GPT-6.1 Sol required slightly less time. The final product was evaluated based on its visual resemblance to the reference image, the truck's handling and performance, its ability to complete the course, and the overall cost in terms of API usage.
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