Grok offers pricing starting at $30/month with up to 10 prompts every 2 hours....

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

Grok offers pricing starting at $30/month with up to 10 prompts every 2 hours. The $80/month plan increases usage limits but still enforces the same prompt cap