← All models Gemini 3.1 Pro editing test Google · Tested Oct 28, 2026 · 49s · $0.63
Four checks All in one 67/90 caught
Grammar & spelling 40/45 Repetitions 8/15 Redundancy 10/15 Consistency 9/15 87 comments · 0 extra flags
Gemini 3.1 Pro caught 67 of 90 planted mistakes, 12th of 16 models tested. It was strongest on grammar and spelling (40 of 45) and missed most on repeated words (8 of 15). The 4 checks took 49s and cost $0.63; asked for all of them in one prompt, it caught 51.
Every comment Gemini 3.1 Pro left 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
Dangling modifier: the door didn't turn the key “Turning the key at last, the door opened” 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” 'one of those who' takes a plural verb: were “one of the last binders in New England who was still” Comma splice “open on her chest, she woke at dawn” Close: tired … tired “thin, tired ring” Close: careful … careful “his careful hands” 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” 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” a haven is safe “a safe haven” began is first “the week we first began” Grandfather's eyes: grey, then blue “the same gray eyes as her grandfather” 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” Nora's home: Chicago, then Boston “the firm in Chicago” Grandmother: Ruth, then Rose “her grandmother, Ruth”