Z.ai releases GLM-5.3 Flash, a 320B-parameter multimodal model

GLM-5.3 Flash packs 320B parameters (18B active), 1M context, and hybrid attention. On Databricks' OfficeQA Pro v2, it delivers 10% higher quality than GLM-5.2 at one-tenth the cost, and nearly matches Luna's DeepSWE performance at twice the throughput.