open weights — A model whose trained parameters are published for anyone to download and run — unlike API-only models you can access but never possess.
Why it matters
GLM-5.3 launches with post-training on a 743B-parameter base focused on coding and agentic tasks, plus what Z.ai calls a major leap in defensive cybersecurity capability among open weightsA model whose trained parameters are published for anyone to download and run — unlike API-only models you can access but never possess.Full definition → models.
