GLM 5.3 caught 78 of 90 planted mistakes, 5th of 16 models tested. It was strongest on grammar and spelling (41 of 45) and missed most on redundancies (12 of 15). The 4 checks took 4m 11s and cost $0.36; asked for all of them in one prompt, it caught 70.
Every comment GLM 5.3 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.