As of September 2026, Grok offers two purchasing options: directly at grok.com...

https://sticky-wiki.win/index.php/What_Security_Certifications_Does_xAI_Claim_for_Grok%3F_39773

As of September 2026, Grok offers two purchasing options: directly at grok.com or via platform X. There’s no paid-plan trial available. The free tier limits users to about 10 prompts every 2 hours