GLM-5.3 matches frontier models on DeepSWE at fraction of cost

Together AI ran 904 DeepSWE rollouts comparing GLM-5.3 to GPT-5.6 Sol and Claude Fable 5. GLM-5.3 ties Fable 5 on pass@1 (69.0% vs 69.7%) but costs $3.99 per rollout vs $21.63, and a GLM-first cascade hits 85.9% at $6.61 per task.