Grok’s paid plans start at $15/month for basic access, with $50/month for...

https://telegra.ph/How-Much-Does-Realtime-Voice-Cost-on-the-Grok-API-10-14

Grok’s paid plans start at $15/month for basic access, with $50/month for advanced features. Both include a cap of about 10 prompts per 2 hours. Note that there’s no free trial, so you’ll want to be sure before subscribing