← All models Claude Opus 5.5 editing test Anthropic · Tested Oct 27, 2026 · 1m 54s · $0.33
Four checks All in one 83/90 caught
Grammar & spelling 43/45 Repetitions 14/15 Redundancy 11/15 Consistency 15/15 84 comments · 1 extra flags
Claude Opus 5.5's comments when asked for all 4 checks in one prompt on our 6,000-word test story, where it left it. Click a missed mistake to find it in the text. The checks come from icanwrite , a markdown editor for writers.
Missed · 7
any other shop: the bakery is on Wharf Street “longer than any shop on Wharf Street” 'one of those who' takes a plural verb: were “one of the last binders in New England who was still” Close: remembered … memory “her hands remembered” a sum is a total “The sum total” finished is complete “completely finished the wine” a haven is safe “a safe haven” began is first “the week we first began”