Is Claude Code more accurate on Hyvä than on Luma?

Yes, measurably. On Hyvä, the codebase is small (~3% of Luma’s frontend code), modern (Tailwind + Alpine.js have huge LLM training corpora), and idiomatic (every component follows the same x-data + ViewModel pattern). Claude Code rarely needs more than 1 round of revision per Hyvä task. On Luma, the RequireJS + KnockoutJS + UIComponent stack is more obscure and Magento-specific — Claude Code is good but slower. Net effect: AI-paired Hyvä dev runs 5–10× faster than hand-written, vs 3–5× on Luma. See our Claude Code + Magento page for the Luma-side workflow.