Blacksmith hits $1 billion as AI-written code swamps checks

Software teams call this continuous integration (CI): each change to a product’s code is compiled and put through automatic checks before it can merge. Blacksmith sells the machines that run those checks. AI coding tools such as Claude Code, Codex and Cursor now write code far faster than before, so the queue of changes waiting for checks keeps growing.

Blacksmith now handles more than 90 million check jobs a week, against 5 million in January, the company says. Yearly recurring revenue is up 17-fold. It also points to Anthropic, which said last month that Claude now writes most of its code and that its own checking load rose 25-fold in six months. Its customer count has roughly doubled since August, to more than 10,000 companies, Fortune adds.

Blacksmith owns its hardware outright, close to 10 megawatts of it across US and European data centres. It plans five times that capacity in 2027, and the new money goes on hardware and hiring. Total funding is now about $125 million, TechCrunch reports.

AI coding tools have turned code checking into a billion-dollar business.