Pareto (formerly Union Alpha) scores 30.7 fixing 105 planted bugs

Paweł Huryn @PawelHurynOriginally posted 2026.09.18

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So I tested Pareto by Unbiased (ex-Union Alpha) on a real work: 2 repos, 105 planted bugs. Find and fix what you can. Score vs cost: GPT-6 Astra (max): 45, $33.03 Fable 5.1 (max): 43, $77.55 Muse Spark 1.3 (max): 32.2, $18.11 Pareto by Unbiased 30.7, $4.81 ⭐ Grok 4.6 (xhigh): 28.7, $18.60 Opus 5 (max): 27, $51.33 Fast and strong. Turns out it's a composite model.