Zhipu AI releases GLM-5.3
Published: August 14, 2026 — THE DECODER
- Same base as GLM-5.2; all gains from extended post-training
- Claims strongest open-weights coding model; biggest jumps in agent tasks
- Cybersecurity post-training produced multi-stage exploit-chain reasoning
- Vendor: 2,436 vulns across 269 projects with Chinese security teams
- Available via GLM Coding Plan; works with ZCode, Claude Code, OpenCode
- Weights open in ~two weeks after security reviews