Grok’s paid plans start at $20/month for up to 10 prompts every 2 hours, with...

https://nova-wiki.win/index.php/Why_Did_xAI_Retire_grok-4-fast_and_My_Bill_Went_Up%3F

Grok’s paid plans start at $20/month for up to 10 prompts every 2 hours, with an option at $50/month for higher usage. There’s no free trial, so you’ll pay from day one