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The 2026 prompting guides of Lovable, Bolt and v0 all say prompt wording changes the output. So a single prompt cannot benchmark a builder. Why prompt sensitivity is a validity threat, and what a fixed, versioned prompt suite looks like.
AI app builders swap default models and scaffolding almost weekly. Read from five 2026 vendor changelogs: why an undated benchmark score decays, and the versioning protocol BuilderProof uses to keep scores reproducible.
Three rigorous, independent AI app builder benchmarks now exist: UI-Bench (design), From Prompt to Product (human end-to-end), and BuilderProof's six-axis rubric. What each measures, mapped side by side from the primary sources.
As of July 2026 the five builders in our cohort bill in five incompatible units. We propose a sixth BuilderProof axis, Cost-to-Ship, that fixes the workload and measures real dollars to a deployed app. Open for review until August 3, 2026.
