We ran 900 DeepSWE rollouts on GLM-5.3 and GLM-5.3 Flash. Flash gives up 5.6 points of pass@1 at 17x lower cost, and only 2.6 points at pass@4.

Z.ai releases GLM-5.3-Flash, an open-source model with 320 billion parameters that lands just three points behind the larger GLM-5.3 on Artificial Analysis's Intelligence Index,…

I test-ran both of this week's open-weight flash models against 24 small, real workloads from an...