Opus 5.5 Loves to Tell You ‘This Matters’ (and Other AI Writing Tells)
A study from the marketing agency Graphite finds that Claude Opus 5.5 uses the phrase “this matters” 116 times as often as human writers, and still has 2,548 AI writing tells despite nearly abandoning the em dash. We explain how the study worked, Opus 5.5’s biggest tells, how they differ from Opus 5 and GPT-6 Astra, why tells keep returning, the study’s limits, and how to edit them out of a draft.
