Grok’s paid plans start at $20/month and go up to $80/month, with a cap of...

https://shed-wiki.win/index.php/How_Do_I_Guarantee_the_Exact_Grok_Model_Version_for_Compliance%3F

Grok’s paid plans start at $20/month and go up to $80/month, with a cap of about 10 prompts every 2 hours to manage usage. There’s no free trial available, so you’ll want to be sure it fits your needs before subscribing