Sonnet 5.5 Writes the Easiest-to-Read Prose We've Measured, Tests Show
every · x · 2026-09-29
Testing outfit every measured Sonnet 5.5's writing and found an average reading grade level of 6.9—easiest to read among models tested. At medium effort: Sonnet 5.5 at 7.12, beating Opus 5.5 (7.28), GPT-6 Sol (7.71), and Luna (8.01); lower is easier. They ran six writing tasks, three runs per effort setting, though the formulas only capture sentence length and word complexity, not argument quality. User @kplikethebird found Sonnet 5.5 useful for sentences and outlines, but longer drafts could bury the main point, make weak transitions, or lose connections between ideas. Practical takeaway: settle the argument first, work in smaller pieces, and check how each section connects.
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