LLM style

Marketing firm Graphite identified 13,000 phrases that appear at least twice as often in AI-generated writing as in human writing. Claude Opus 5.5 uses "this matters" 116 times more than humans, while OpenAI's Astra favors "corrective framing" more than 100 times as often. Em-dash use has collapsed across frontier models, but total tells are holding steady, according to Graphite.