← All models Claude Sonnet 5.5 editing test Anthropic · Tested Oct 27, 2026 · 1m 32s · $0.17
Four checks All in one 73/90 caught
Grammar & spelling 40/45 Repetitions 9/15 Redundancy 11/15 Consistency 13/15 71 comments · 0 extra flags
Claude Sonnet 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 · 17
who, not whom: subject of 'was' “whom she guessed was the owner” any other shop: the bakery is on Wharf Street “longer than any shop on Wharf Street” Fragment: the survey has no verb “The survey from twelve years ago, which an engineer from the county” in to, not into “turned his uniform into the quartermaster” 'one of those who' takes a plural verb: were “one of the last binders in New England who was still” Distinctive, chapters apart: meticulous “His records were meticulous” Distinctive, chapters apart: gleaming “a gleaming pair of shoes” Distinctive, chapters apart: sodden “carrying sodden leaves” Distinctive, chapters apart: brittle “a short, brittle sound” Distinctive, chapters apart: stubbornly “which stuck stubbornly” Close: remembered … memory “her hands remembered” twins are two “the two twins” an agreement is mutual “By mutual agreement” a haven is safe “a safe haven” began is first “the week we first began” The bakery has three tables; she sits at the fourth “three small tables” Tomas beside him: two decades, then thirty years “for most of two decades”