Grok’s paid plans start at $15 per month for basic access and $50 for the pro...

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

Grok’s paid plans start at $15 per month for basic access and $50 for the pro tier, with a cap of about 10 prompts every 2 hours. There’s no free trial available, so you pay upfront knowing exactly what you get