Grok’s paid plans start at $49/month, with a $99/month option offering more...

https://rileysnewcolumn.readspirex.com/posts/why-did-grok-text-to-speech-jump-from-4.20-to-15.00

Grok’s paid plans start at $49/month, with a $99/month option offering more features. Usage caps limit you to about 10 prompts every 2 hours, so pacing your queries is important. Note there’s no free trial—subscriptions begin with immediate billing