Claude Opus 5.5 Has a Verbal Tell: 'This Matters'

Claude Opus 5.5 uses 'this matters' 116 times more often than human writers, Graphite found. Graphite compared AI output with 10,000 pre-ChatGPT articles as a human baseline. It defines an AI writing tell, meaning a phrase that signals machine authorship, as one used at least twice as often.