This has been my experience as well. Grok will end tasks almost immediately and claim "Done!". It's definitely the laziest and most "dishonest" of all the models. The others aren't perfect, but I can't use Grok for any serious coding task.
simianwords · · focus · HN ↗
The personality is bland and it doesn’t work nearly as hard or even tries to help.
slowin · · focus · HN ↗