GLM-5.3 vs. Claude Fable 5 on DeepSWE: Cost, Coding, and Routing

In our GLM-5.3 vs. Claude Fable 5 comparison on DeepSWE, a benchmark that tests a model's software engineering ability across many task types and programming languages, the two models are almost impossible to separate on quality. Fable 5 leads pass@1 by 0.7 points. It also costs 5.4x more per rollout and is the single most expensive configuration on the DeepSWE board. That combination makes the interesting question a narrow one: what does the premium buy when the accuracy is the same?

DeepSWE · Head to Head

GLM 5.3 vs Claude Fable 5 at a glance

Model

Pass@1