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

https://lanescooljournal.inkharbory.com/posts/how-much-does-code-execution-cost-on-grok-api

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