Grok’s paid plans start at $30/month, with a $75/month option for higher usage....

https://uniform-wiki.win/index.php/Does_Grok_Have_Any_Published_Price_for_Video_Generation_on_the_API%3F

Grok’s paid plans start at $30/month, with a $75/month option for higher usage. Each plan limits you to about 10 prompts every 2 hours. There’s no free trial, so you’ll need to choose a plan upfront based on your typical prompt volume and budget.