Grok offers two paid plans starting at $29/month for up to 300 prompts and...

https://wiki-cafe.win/index.php/Can_Two_SuperGrok_Users_Get_Different_Models_on_the_Same_Day%3F

Grok offers two paid plans starting at $29/month for up to 300 prompts and $59/month for up to 700 prompts, capped at about 10 prompts every 2 hours. There’s no free trial, so buyers should plan to commit when subscribing