Grok offers a Basic plan at $15/month allowing up to 10 prompts every 2 hours,...

https://foxtrot-wiki.win/index.php/Does_Grok_Free_Tier_Include_Memory_and_Projects%3F

Grok offers a Basic plan at $15/month allowing up to 10 prompts every 2 hours, and a Pro plan at $40/month with the same prompt cap but faster response times. Both paid plans do not include a free trial