Grok’s paid plans start at $25/month with a limit of 10 prompts every 2 hours....

https://wiki-net.win/index.php/How_Many_Images_Per_Day_on_Grok_Free_Tier_is_it_Really_3%3F

Grok’s paid plans start at $25/month with a limit of 10 prompts every 2 hours. The top tier is $75/month and offers expanded features but similar prompt caps. Note there’s no free trial available, so plan accordingly before committing