Grok offers paid plans starting at $20/month and $80/month for higher usage,...

https://fair-wiki.win/index.php/Should_I_Buy_Grok_on_grok.com_or_Through_X_Premium%3F

Grok offers paid plans starting at $20/month and $80/month for higher usage, each limited to about 10 prompts every 2 hours. There’s no free trial available, so you’ll want to be sure the plan fits your team’s prompt volume before committing