Markets
CROSS-CATEGORY: Two Chinese Labs Dropped Frontier Open Weights Inside 24 Hours, Both Benchmarked on Coding and Security Rather Than Chat
Zhipu/Z.ai published GLM-5.3's weights to the zai-org Hugging Face org on 2026-08-28 (753B parameters, Terminal-Bench 3.0 at 28.3, CyberGym 84.5, ExploitBench 54.4, DeepSWE 66.9), and Tencent open-sourced Hy4 preview (770B) the same day. Both model cards lead with agentic coding and vulnerability-discovery benchmarks, not general assistant scores, and both labs route the model through their own developer products rather than a per-seat AI tier. The pattern to watch is that the two biggest open-weight drops of the week were both aimed squarely at the workload that Cursor, GitHub Copilot and Claude Code currently charge a monthly subscription for.
Source
↳ Follow the thread