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Pricing, per 1M tokens (vendor docs): On output tokens, GLM-5.2 is less than a fifth the price of Opus.
Key facts
The team ran Opus 4.8 with extended thinking on high, and GLM-5.2 with thinking set to high (GLM-5.2 also has a higher Max tier they didn't use)
Opus 4.8 built in Claude Code; GLM-5.2 built in Pi over OpenRouter
Z.ai positions it roughly between Claude Opus 4.7 and 4.8 at similar token usage
To cut through the vibes, they gave Opus 4.8 and GLM-5.2 the same one-shot prompt: build a 3D platformer game from scratch, in raw WebGL, with no game engine or 3D library
Summary
GLM-5.2 came out, and it's another step forward for what open models can do. So they ran it head-to-head against Claude Opus 4.8: same one-shot prompt, build a 3D platformer in raw WebGL from scratch. They're not switching their main off Opus. You can play both games right now, or grab the source:. GLM-5.2's game: 3dgame-glm.d.ritzademo.com.