Z.ai launched GLM-5.3-Flash, a natively multimodal 320B-A18B MIT-licensed model with a 1M-token context, previously previewed as the stealth Ox Alpha. On Z.ai's Code Bench it matches Claude Opus 4.8 at $0.15/$0.50 per million input/output tokens, and it runs entirely on Chinese AI chips.

Key Takeaways

  • ✓MIT-licensed 320B-A18B sparse model with native multimodality and a 1M-token context
  • ✓Matches Claude Opus 4.8 on Z.ai's real-world Code Bench at roughly an order-of-magnitude lower price
  • ✓Previously the stealth Ox Alpha on OpenRouter; weights, API, ZCode, and Coding Plan are live
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Matches Claude Opus 4.8 on Z.ai's real-world Code Bench at roughly an order-of-magnitude lower price
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💰 Cost & PlansCompare
GLM-5.3-Flash · in: $0.15 / out: $0.5
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🛠️ Ecosystem & IDERules
AI · LLM · Coding
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