A 30-day blind test: 800 meta titles + 800 product descriptions rewritten by both Qwen 2.5 14B (self-hosted on a refurbished workstation) and Claude Sonnet 4, rated by 3 SEO contractors. The result is not a clean win for open weights — it's a split. Where Qwen breaks even, where it collapses, and the actual cost math behind self-hosting for repeat-pattern SEO work.