Grok Bot users hit their limits overnight. Musk says the agent cost too much to run.

Agents are expensive, and Grok Bot subscribers just found out how much. Over Halloween weekend, some users woke up to find their weekly allowance used up, with meters jumping from as low as 50% to 100% even though they hadn't used the agent overnight, TechCrunch's Amanda Silberling reported.

It wasn't a bug. Replying to a user on X on Sunday, Elon Musk wrote that the cost of serving Grok Bot "was unsustainably high relative to revenue." He hasn't raised it on his main feed, and he hasn't said what subscribers' limits will look like from here.

The awkward timing

Grok Bot had been presented as a hit. Musk recently called it the fastest-growing product he has ever seen. SpaceX, now a public company, said in a filing last month that AI accounts for 52% of its income, and its renamed Super Intelligence division posted a $431 million profit, which would have been bigger without $1.2 billion in one-time costs from the Cursor acquisition. A profitable AI division is rare. The agent inside it, apparently, wasn't paying its way.

What it says about agents

An agent that browses, clicks and retries burns far more compute than a chatbot answering one question. Flat subscriptions were priced for chat. When usage moves to long-running tasks, either the price goes up or the allowance goes down, and here it went down over a weekend with no notice.

That's the lesson for anyone who depends on an agent product: the limits can move under you. If a workflow matters, know what happens when the quota runs out, and don't assume this month's allowance will be next month's.

Scoreboard update: Humans +1. The bill catches up with an agent sold as a runaway hit.

Stay undead.