Grok’s paid plans start at $15/month for basic access and $45/month for more...

https://wiki-spirit.win/index.php/Grok_API_Pricing_for_Grok-4.3_Per_1M_Tokens:_A_Deep_Dive

Grok’s paid plans start at $15/month for basic access and $45/month for more features, with a prompt cap of about 10 prompts every 2 hours. There’s no free trial available, so you pay upfront. Ideal for steady, moderate use without unexpected overage fees