Originally published on rohitraj.tech
Z.ai shipped GLM-5.2 as open weights (MIT) in June 2026, and it matches Claude Opus 4.8 on real coding-agent tasks at a fraction of the per-token price. This is the builder\'s read: what actually shipped, the real code to call it and drop it into Claude Code, an honest cost breakdown (the per-token gap is huge but GLM burns ~3.3x more tokens), a side-by-side table, when to stay on Opus, and the hybrid routing setup I\'d actually ship — Opus for the 20% of tasks where the gap bites, GLM-5.2 for the other 80%.
Read the full version with code samples, diagrams, and architecture details: GLM-5.2 vs Claude Opus 4.8: Should You Switch Your Coding Agent? (2026)
More engineering notes: rohitraj.tech/en/notes
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