Writing winner: ChatGPT held its lead — barely
Across 18 standardized prompts (brief generation, long-form, rewriting, SEO outlines), ChatGPT scored 8.9/10 on output quality. Claude 3.7 closed to 8.7. Differentiator: tone-matching on long-form. Loser: Jasper, now trailing both on raw quality at a 4× price.
