Claude Fable 5.1: fewer generic pages, better storytelling, and the top spot on our Landing Page benchmark

• —Claude Fable 5.1 leads our Landing Page leaderboard overall and on every dimension we measured: General Preference, Usability, Prompt Adherence, and Visual Appeal.
• —Its lead is widest at Ideation, where it swept every comparison against Muse Spark 1.1. Professional designers praised its outputs in this phase on asset choice, visual consistency, and layout balance against the brief. One called it 'the perfect alliance between the prompt and the output.'
• —Fable 5.1 makes its mistakes in Mockup, where it works from a style kit and a screenshot of the Ideation output. Spacing and alignment drew the most complaints, followed by typography and contrast. Designers flagged an FAQ section that didn't line up with the sections around it, heading text with no line height set, and text set over imagery without enough contrast.
• —Fable 5.1 is also really strong at refining existing pages, rebuilding layout balance and completing the fixes designers ask for. One designer called the output 'balanced, engaging and sharp.'
• —Compared to Fable 5, we also noticed Fable 5.1 producing fewer generic outputs and better first-prompt results. Hero sections were more diverse and interactive, and the storytelling was stronger.
• —At High Effort, Fable 5.1 has a median generation time of 3 minutes 20 seconds per page, 21.1% faster than Claude Opus 5, while beating it in 60.8% of comparisons.

Claude Fable 5.1 leads Ideation, sweeping Muse Spark 1.1 on every comparison.