Analysis: Claude Opus 5.5 Writes Shorter Sentences, 95% Fewer Em Dashes

Text Arena compared Opus 5.5 against Opus 5 and found 10 of 12 writing metrics improved, including 17% shorter sentences, 95% fewer em dashes, and a drop in long-word usage, signaling a more natural style.

2026-09-26 ~ 2026-09-26 · 2 related posts

• Opus 5.5 writes shorter sentences and 95% fewer em dashes, but hedges rise 97% — arena · 2026-09-26
• Opus 5.5 cuts em dashes 95% and shortens sentences 17%, Text Arena writing analysis finds — devdigest · 2026-09-26