GLM 5.2 vs. Opus

Zhihu's GLM-5.2 open-weights model was tested head-to-head against Claude Opus by building a 3D platformer game from scratch in raw WebGL. While Opus completed the task faster and produced a cleaner, more correct game with visual verification capabilities, GLM-5.2 proved to be a genuinely capable and affordable alternative at a fraction of the cost, earning a permanent place in the testing arsenal due to its open-source availability and freedom from potential discontinuation risks.