← All models GPT-6 Luna editing test OpenAI · Tested Oct 27, 2026 · 1m 49s · $0.0049
Four checks All in one 60/90 caught
Grammar & spelling 38/45 Repetitions 6/15 Redundancy 6/15 Consistency 10/15 62 comments · 1 extra flags
GPT-6 Luna'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 · 30
Dangling modifier: the door didn't turn the key “Turning the key at last, the door opened” who, not whom: subject of 'was' “whom she guessed was the owner” Misplaced modifier: bound nearly every “he had nearly bound every family Bible” 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” Restrictive clause, no commas: the entries that held “The entries, which held only a single word, were” 'one of those who' takes a plural verb: were “one of the last binders in New England who was still” Close: careful … careful “his careful hands” Close: silence … silent “The silence in the workshop” 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” a sum is a total “The sum total” an agreement is mutual “By mutual agreement” planning is in advance “no advance planning” began is first “the week we first began” join together “wants them to join together” an outcome is final “The final outcome” The bakery has three tables; she sits at the fourth “three small tables” 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” The bakery: two doors down, then a ten-minute walk “BAKERY TWO DOORS DOWN”