Grok Bot users woke up over the Halloween weekend to find their weekly allowance gone, and Elon Musk has now told them why. "The cost of serving Grok Bot was unsustainably high relative to revenue," he wrote on X on Sunday 1 November US time.

Elon Musk shaking hands with an official as he arrives at the Pentagon in Virginia on 21 March 2025. Photo: US Department of Defense (public domain), modified