Grok offers a base plan at $15/month with a cap of 10 prompts every 2 hours,...

https://www.hometalk.com/member/262182838/allen1183737

Grok offers a base plan at $15/month with a cap of 10 prompts every 2 hours, suitable for light use. For heavier needs, the Pro plan costs $40/month and removes the prompt limit. Note that all paid plans start immediately—there’s no free trial