Grok’s paid plans start at $12/month and go up to $50/month, with a cap of...

https://titussexcellentnews.nexorafield.com/posts/why-does-my-grok-plan-not-show-which-model-answered-my-prompt

Grok’s paid plans start at $12/month and go up to $50/month, with a cap of roughly 10 prompts every 2 hours to manage usage. There’s no free trial available, so you’ll want to be sure the plan fits your needs before subscribing