From the source

GLM-5

New model

GLM-5 is a new model from Z.ai designed for complex system engineering and long-range Agent tasks, with deep-reasoning performance in backend architecture, algorithms, and bug fixing.

It benchmarks against Claude Opus 4.5 and integrates DeepSeek Sparse Attention for token efficiency.

From the source
Designed for complex system engineering and long-range Agent tasks, GLM-5 shifts the paradigm from coding to engineering, demonstrating strong deep-reasoning performance in backend architecture, complex algorithms, and stubborn bug fixing.
docs.z.ai