Z.ai Releases GLM-5.1: 754B Parameter MIT-Licensed Model for Long-Horizon Tasks

Summary

Chinese AI lab Z.ai has released GLM-5.1, a 754 billion parameter model (1.51TB on Hugging Face) under the MIT license. The model is the same size as the previous GLM-5 release and shares architectural foundations, but is specifically oriented toward long-horizon tasks — suggesting improved capabilities for sustained, multi-step reasoning and agentic workflows. The MIT licensing of a model at this scale is notable, as it makes GLM-5.1 one of the largest fully open-weight, permissively licensed