Grok’s paid plans start at $25/month with a limit of 10 prompts every 2 hours....

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

Grok’s paid plans start at $25/month with a limit of 10 prompts every 2 hours. The top tier is $75/month and offers expanded features but similar prompt caps. Note there’s no free trial available, so plan accordingly before committing