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This study identifies specific lexical markers and syntactic patterns that distinguish frontier large language models from human writers, highlighting how AI-generated text evolves differently across competing model families. The findings underscore the importance of understanding these emerging "tells" for content verification and detecting synthetic prose in an increasingly automated information ecosystem.

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Opus 5.5 loves to tell you ‘this matters’ (and other AI writing tells)

TechCrunchOctober 1, 20264 min read

Opus 5.5’s biggest tell is the word “dependable,” which pops up 23 times more often than in human samples.

Now that LLM-generated prose is everywhere, human beings are eager for ways to sniff it out. While early tells like em-dashes and “delve” are long gone, researchers say there are still plenty of telltale habits that AI models fall back on when writing prose. A new study from the marketing firm Graphite looked at the writing habits of frontier models, sussing out each model’s favorite words and phrases. While old tells…

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