GLM-5.3 Flash launches, rivals Opus 4.8 at fraction of cost

Z.AI's GLM-5.3 Flash (formerly Ox Alpha) packs 320B parameters, 18B active, 1M context, and hybrid attention. On DeepSWE it nearly matches Luna's performance while doing twice as much work for the same budget. Unsloth released GGUF quants, and it runs on Databricks and Together AI.