Claude Fable 5.2 editing test

Claude Fable 5.2 caught 89 of 90 planted mistakes, 1st of 18 models tested. It was strongest on grammar and spelling (45 of 45) and missed most on repeated words (14 of 15). The 4 checks took 4m 8s and cost $2.29; asked for all of them in one prompt, it caught 88.

Every comment Claude Fable 5.2 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.