WASHINGTON — Two weeks ago, Elon Musk called Grok Bot the fastest-growing product he had ever seen. Now he admits it has been costing far more to run than it brings in.

"The cost of serving Grok Bot was unsustainably high relative to revenue," Musk wrote on X on Sunday, November 1, 2026.

He was replying to a subscriber who asked for a reset after many paying users found their weekly usage allowance running out days earlier than usual. Musk gave no figures for how much the AI agent costs to operate, and no timeline for any change to the limits.

The comment is a rare admission from one of the world's biggest AI players that powerful AI tools can be very expensive to run, even when users are paying for them.

What is Grok Bot?

Grok Bot is an AI agent made by SpaceX, which took over Musk's artificial intelligence company xAI earlier this year. Unlike a simple chatbot that answers one question at a time, an AI agent works more like a digital employee: it can carry out long, multi-step tasks on a user's behalf.

Grok Bot is sold through paid subscriptions only, with no free tier. Each plan comes with a weekly usage allowance.

From "fastest-growing" to "unsustainable"

The change in tone has been sharp:

  • Mid-October: On SpaceX's third-quarter earnings call, Musk said he had never seen anything grow as fast as Grok Bot, and that users were using it more each week, not less. SpaceX President Gwynne Shotwell said Grok Bot had about 800,000 paid weekly users in early October, more than double the previous month.
  • November 1: Musk said serving those users had become unsustainably expensive. In other replies, he asked a frustrated user whether a higher-usage plan cost too much, and described the tighter limits as being sensible.

Why AI agents are so expensive

The problem is built into how AI agents work. Every task Grok Bot performs uses powerful computer chips in large data centres, which consume huge amounts of electricity.

Under a monthly subscription, the price is fixed, but the cost is not. The more a subscriber uses the agent, the more it costs SpaceX to serve them. When usage per user keeps rising, as Musk himself boasted, costs can quickly outrun the subscription fees.

There is also an opportunity cost. SpaceX's AI division, now called Super Intelligence, earned about US$7.6 billion in the third quarter, much of it from renting out computing power to other companies. Every hour of computing used by Grok Bot is an hour that cannot be rented out.

Musk's long-term answer is to put data centres in space. Just two days before his Grok Bot comments, he predicted that computing on Earth would be tiny compared with computing in orbit. But that plan is still at least a year away from launch.

Users cry foul

Many subscribers are unhappy. Some said on X that their usage meters jumped sharply, from half used to fully used, even when they were not using the agent at all. A popular Reddit thread called the change an "indirect rug pull", accusing the company of quietly cutting what users had paid for.

SpaceX has not explained exactly what changed in the allowances.

A wider problem for the AI industry

Grok Bot is not alone. OpenAI has also recently tightened usage limits for some ChatGPT users. Across the industry, companies are discovering that the most advanced AI tools are costly to run, and that flat-rate subscriptions may not cover the heaviest users.

For users everywhere, including the growing number of Ghanaian students, freelancers and businesses relying on AI tools, the message is clear: expect tighter limits, higher prices or new pricing plans as AI companies try to make the numbers add up.

What to watch

  • whether SpaceX raises Grok Bot's prices or introduces new plans
  • whether usage limits are restored or cut further
  • how other AI companies respond to the same cost pressures
  • progress on Musk's plan for data centres in orbit