{"data":{"id":"7d5fa744-732c-49fc-a422-82cd0985a927","title":"Claude Opus 5.5 uses 95% fewer em dashes, but its answers are getting longer","summary":"Anthropic's Claude Opus 5.5 model has changed its writing style to look less like AI-generated text, using 95% fewer em dashes (dropping from 15.2 to 0.8 per 1,000 words) and shorter sentences compared to its predecessor Opus 5. While the new model produces more natural-sounding writing with simpler wording and fewer obvious AI patterns, it compensates by generating longer overall responses, averaging 481 words instead of 453.","solution":"N/A -- no mitigation discussed in source.","labels":["research"],"sourceUrl":"https://www.bleepingcomputer.com/news/artificial-intelligence/claude-opus-55-uses-95-percent-fewer-em-dashes-but-its-answers-are-getting-longer/","publishedAt":"2026-09-26T16:26:58.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude Opus 5.5","Claude Opus 5"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"patchAvailable":null,"disclosureDate":"2026-09-26T16:26:58.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"trivial","impactType":null,"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.75,"researchCategory":null,"atlasIds":null}}