Grok’s paid plans start at $20/month and go up to $50/month, with usage capped...

https://titussexcellentnews.nexorafield.com/posts/what-is-grok-auto-mode-and-how-does-it-pick-a-model

Grok’s paid plans start at $20/month and go up to $50/month, with usage capped at about 10 prompts every 2 hours. There’s no free trial available