Musk Says Grok Bot Costs Were Unsustainably High as Users Hit Tighter Usage Limits

Over the Halloween weekend, some Grok Bot subscribers found that their weekly usage allowances had suddenly been used up, even though they had not used the product overnight, TechCrunch reported. Users posting on X said their usage had jumped from as little as 50 per cent to 100 per cent.

Replying to a user's question on X on Sunday, Musk wrote: "The cost of serving Grok Bot was unsustainably high relative to revenue." According to TechCrunch, he has not raised the matter on his main feed and has not said how subscribers' limits will work from now on.

The story was picked up by outlets including Forbes Middle East, The Economic Times, Seeking Alpha, Neowin and The Next Web. Several noted that the remark came only weeks after Musk had promoted the product's growth.

A Flagship for the Newly Public SpaceX

Grok Bot has been presented as a success for SpaceX since the company went public. TechCrunch reported that a SpaceX filing last month showed AI accounting for 52 per cent of company income. The renamed Super Intelligence division made a profit of $431 million, unusual in an industry where most model developers lose money. TechCrunch said the profit would have been higher without $1.2 billion of one-time costs linked to SpaceX's acquisition of Cursor.

Musk has called Grok Bot "the fastest growth of a product that I've ever seen in my life," according to TechCrunch. He has also kept promoting its consumer features, such as help with buying gifts.

Why It Matters

Musk's admission adds to the evidence that agentic AI is expensive to run. Agents carry out long, multi-step tasks for users, so each session uses much more compute than a typical chatbot exchange. Flat-rate subscriptions can then fall short of the cost of heavy users. Other AI providers have also tightened limits or changed pricing on their coding and agent products as usage has grown.

For SpaceX, the episode raises questions about how much of its AI division's reported profitability can last as usage scales, and whether the margins depend on rationing access. Some financial outlets, including GuruFocus, tied the comments to scrutiny of the company's stock-market valuation.

For enterprise buyers, the lesson is practical. Usage caps on agentic AI services can change at short notice, so contracts and budgets for these tools need to allow for providers repricing or restricting access as their compute bills rise.