Zhipu AI releases GLM-5.3, claims it's the strongest open-weights coding model
50% improvement over GLM-5.2 through post-training alone — Zhipu AI's open-weights coding model is shipping in two weeks.
Why it matters
A credible Chinese lab (Zhipu) is advancing the open-weights coding model race with measurable gains. The cybersecurity training angle and imminent open-source release make this a genuine capability milestone practitioners will evaluate against Codex, DeepSeek, and other open coding models.
The key facts
5 to knowGLM-5.3 claims title of strongest open-weights coding model
50% performance improvement over predecessor (GLM-5.2) via post-training
Cybersecurity-trained variant found 2,436 vulnerabilities across 269 projects
Weights going open-source in two weeks (mid-to-late August 2026)
Benchmark claims are Zhipu's own; independent eval data not yet available
Go to the source
The Decoderthe-decoder.com
Publisher excerpt: Zhipu AI has released GLM-5.3, a model that, according to its own benchmarks, is the most powerful open-weights coding model, with a 50 percent improvement over its predecessor through post-training alone. Trained for cybersecurity, GLM-5.3 helped security teams find 2,436 vulnerabilities across…