GLM-5.3 vs. GLM-5.3 Flash on DeepSWE: Cost, Coding, and Routing

‍GLM-5.3 and GLM-5.3 Flash are the same family at two sizes. GLM-5.3 is the full open-weight model; GLM-5.3 Flash is its distilled sibling at one-seventeenth the rollout price. The question every team asks about a flash variant is how much quality it gives up. On DeepSWE, a benchmark that tests a model's software engineering ability across many task types and programming languages, the answer is smaller than the headline pass@1 gap suggests, because the Flash is not a scaled-down clone of the full model. It is a redistribution of its abilities, and the thing it actually lost is not the thing the headline numbers point to.

DeepSWE · At a Glance

GLM 5.3 vs GLM 5.3 Flash, the headline numbers

Model

pass@1