Grok’s paid plans start at $20/month for basic access and $50/month for premium...

https://hotel-wiki.win/index.php/How_Much_Are_the_$25_Grok_API_Trial_Credits_Worth_in_Testing%3F

Grok’s paid plans start at $20/month for basic access and $50/month for premium features, with usage capped at about 10 prompts every 2 hours. Note, there’s no free trial, so you’ll want to be sure it fits before committing