Z.ai released GLM-5.3 as open weights, calling it the lab's most capable model for agentic coding and cyber defense. The companion Flash variant matches Claude Opus 4.8 on Z.ai's real-world coding bench, with 1M context and native multimodal support. The license moved from MIT to semi-non-commercial terms similar to Kimi and Qwen.

Key Takeaways

  • ✓Weights are on Hugging Face for download, local inference, and customization
  • ✓Built for agentic coding and cyber defense; Flash matches Opus 4.8 on Z.ai Code Bench
  • ✓1M-token context and native multimodal; license is now semi-non-commercial
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Key Decision Metrics at a Glance

TL;DR Verdict
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Built for agentic coding and cyber defense; Flash matches Opus 4.8 on Z.ai Code Bench
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in: $1.4 / out: $4.4
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🛠️ Ecosystem & IDERules
AI · LLM · Open Source
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Up NextGLM-5.3-Flash Drops Open-Weight: 320B-A18B Multimodal Coder Matches Opus 4.8
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