Grok’s paid plans start at $15 per month for basic access and $50 for the pro...

https://lanesniceblog.scriblorax.com/posts/how-do-i-audit-my-integration-for-old-grok-model-ids

Grok’s paid plans start at $15 per month for basic access and $50 for the pro tier, with a cap of about 10 prompts every 2 hours. There’s no free trial available, so you pay upfront knowing exactly what you get