
model-release
GLM-5.3 Is Out: What Shipped and What's Still Staged
Z.ai released GLM-5.3 on Aug 14, 2026 — same base as GLM-5.2, all gains from post-training. See confirmed specs, staged API access, and the open-weight timeline.
Jessie
•12 min
Technical insights, tutorials, and updates from the EvoLink team. Learn how to optimize your AI costs and build better applications.

Z.ai released GLM-5.3 on Aug 14, 2026 — same base as GLM-5.2, all gains from post-training. See confirmed specs, staged API access, and the open-weight timeline.

Z.ai's own table shows GLM-5.3 trailing Claude Fable 5 — and closing fast. Compare benchmarks, API contracts, and access reality before routing agents.

Same base model, all post-training gains — plus a breaking change: thinking can no longer be disabled. See verified differences and when to stay on GLM-5.2.
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