GLM-5.3 Outperforms Fable: +11 Points, Half the Cost

zainhas · x · 2026-08-23

Evaluation results show that a workflow using GLM-5.3 first and escalating to Fable only on verifier failure achieves 81.1% accuracy at $10.74 per task. This represents an 11-point improvement over Fable alone at half the cost. With a high behavior correlation of 0.65 between the models, the author suggests replacing Fable directly with GLM-5.3.

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