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Anthropic says it fixed Claude’s writing. I ran the evals to check.

calendar_today September 29, 2026 person Jim Bennett domain arize-ai

Opus 5.5 dropped em dashes from 12.9 per 1,000 words to two in 57,000 words, and cut the rest of the Claudisms in half. Better, but not fixed. The post Anthropic says it fixed Claude’s writing.

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