Elon Musk says 'unsustainably high' costs are the reason for Grok Bot usage limits

The SpaceX CEO wrote on X on Sunday that the cost of serving the company's AI agent was "unsustainably high relative to revenue," after some users complained that their weekly allowances were running out faster than usual.

SpaceX launched Grok Bot, an AI agent that uses a virtual computer to perform tasks on behalf of humans, like shopping, in August. It's available in a series of tiers ranging from free to $200 a month.

All of those tiers come with varying usage limits that refresh weekly, a tactic employed by SpaceX and other AI agents, such as Meta's Muse, to prevent users from racking up…