AnalysisAI ModelsAugust 18, 2026

DeepSeek V4 Pro 0813 vs Claude Fable 5: routing cascade solves 82.7% at 62% lower cost

On DeepSWE, a Pro-first cascade solves 82.7% of tasks at $8.28 each vs Fable alone at 69.7% for $21.63. Fable leads pass@1 (69.7% vs 62.8%), but Pro wins pass@4 (88.5% vs 84.1%) at 90x lower cost per rollout.

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