Gemini 4 Carbon editing test

Gemini 4 Carbon caught 88 of 90 planted mistakes, tied 2nd of 18 models tested. It was strongest on repeated words (15 of 15) and missed most on grammar and spelling (43 of 45). The 4 checks took 3m 53s and cost $0.83; asked for all of them in one prompt, it caught 84.

Every comment Gemini 4 Carbon 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.