An Employee's Side Project Ran Up an $81,000 AI Bill

Slash, a San Francisco fintech, says one of its employees spent $81,267 in AI tokens building a meme video game in a single day. The number, shown in a screenshot the company shared, covers coding tools and the tokens that fed them. The employee, Nicolas Brillante, the firm's head of strategic verticals, had used Anthropic's Claude to build Brainrot Shooter, a simple online game stitched together from internet meme culture.

"This was a genuine accident, I underestimated my own ability," Brillante posted on X. The detail that makes the story land is how ordinary it was. He was not running a data centre or training a model. He was building a small game over the course of a day, and the meter kept ticking the whole time.

How a bill gets that big

Agentic coding tools work by calling a model over and over, often many times for a single instruction, reading files, proposing changes, checking the result, then trying again. Each of those loops costs tokens. When a person drives the tool carefully, the spend stays modest. When the tool runs long sessions on an expensive model, the cost compounds quietly in the background until someone looks at the invoice. That is the mechanism behind the eye-watering figure, reported by outlets including the American Bazaar.

A happy ending, sort of

Slash took it in good humour. The company encouraged people to play Brainrot Shooter so it could file the spend under marketing, and the joke worked better than the budget did. In its first 48 hours the game pulled in roughly 6,912 players who logged close to 9,000 hours between them, after the story went viral.

The episode is funny, but it points at something real. Plenty of people are now writing software with tools that bill by the token, and the relationship between effort and cost is not as obvious as it looks. This is the unglamorous footnote to the broader debate about whether these tools replace developers, a question we examined in our look at the programmer-obsolescence myth. The tools are powerful. They are also easy to leave running, and the bill arrives either way.