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Relevant tests indicate that Anthropic's Claude Opus 5.5 has demonstrated significant changes in multiple writing metrics compared to its predecessor, Opus 5. Notably, the usage of dashes has plummeted by approximately 95%, with the frequency per thousand words dropping from 15.2 to 0.8. Semicolon usage has also decreased by 73%, with the frequency per thousand words falling from 6.10 to 1.64. Meanwhile, the average sentence length has shortened from 12.14 words to 10.03 words, resulting in more concise phrasing. Additionally, the average response length has increased from 453 words to 481 words, making it the Opus model with the longest average writing length in the comparison. Among the 12 writing metrics, 10 have changed in the direction deemed to be an improvement.
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