← All models GPT 5.5 editing test OpenAI · Tested Oct 28, 2026 · 1m 50s · $0.28
Four checks All in one 67/90 caught
Grammar & spelling 40/45 Repetitions 7/15 Redundancy 8/15 Consistency 12/15 69 comments · 2 extra flags
GPT 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 · 23
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” Close: neatly … neat “neatly labeled” Distinctive, chapters apart: gleaming “a gleaming pair of shoes” Distinctive, chapters apart: sodden “carrying sodden leaves” Close: whispered … whispered “he whispered, as if it were a secret” 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” one shrugs with the shoulders “shrugged his shoulders” the reason … was because “was because he had never paid himself” an agreement is mutual “By mutual agreement” finished is complete “completely finished the wine” a haven is safe “a safe haven” began is first “the week we first began” Said on Friday: the day after tomorrow is Sunday “On Friday a woman knocked” Tea becomes coffee “poured her a mug of tea” Tomas beside him: two decades, then thirty years “for most of two decades”