Z.AI GLM (GLM-5.2, GLM-5.3, GLM-5.3 Flash)

GLM-5.3 weights were published on Hugging Face on 28 August 2026 after a two-week safety evaluation, and GLM-5.3 Flash shipped with MIT weights at launch.

GLM-5.3 ships under a custom license that grants broad use, modification, and commercial rights but requires a Z.AI security review, with scope set by Z.AI, for Model-as-a-Service operators above $10B aggregate revenue; because the review gate sits with the vendor, the grant is conditional rather than clean.

Independently hosted on widely available hardware with vLLM and SGLang support and a large provider ecosystem, with quantized community builds available.

Architecture, parameter counts, post-training changes, and evaluation results including CyberGym scores are published, and the release was held back for documented safety evaluation, but no training data or reproducible recipe accompanies the weights.

Limited: an equivalent model can be approximated from the published post-training description but not rebuilt.

Z.AI publishes GLM weights and post-training change notes on Hugging Face and takes some outside tooling pull requests, but the release train and training data remain proprietary and internal.