Story by Beatrice Nolan

5 min read

At Anthropic—an AI lab building some of the world’s most advanced models—engineers are no longer writing the code that powers their products; they’re outsourcing it to AI. The head of Anthropic’s Claude Code, Boris Cherny, has announced he hasn’t written any code in more than two months.

In a post on X, Cherny said 100% of his code is now written by Anthropic’s Claude Code and Opus 4.5. Across the rest of the company, he says “pretty much 100%” of code is also AI-generated.

“For me personally, it has been 100% for two+ months now, I don’t even make small edits by hand,” Cherny wrote in a post on X responding to AI researcher Andrej Karpathy. “I shipped 22 PRs (pull requests) yesterday and 27 the day before, each one 100% written by Claude.”

The comments echo earlier remarks by Anthropic CEO Dario Amodei at the World Economic Forum earlier this month, where he noted that some engineers at his company have stopped writing code themselves and instead rely on AI models to generate it while they focus on editing. At Davos, Amodei predicted that the industry may be just six to twelve months away from AI handling most or all of software engineering work from start to finish.

Cherny isn’t the only prominent engineer to announce they have largely abandoned manual coding. Roon, a popular pseudonymous account on X written by an OpenAI researcher, also said in a post on X that he no longer writes any of his own code. “100%, I don’t write code anymore,” the user wrote when asked what percentage of his coding is done by AI models. In a separate post, he added: “Programming always sucked. It was a requisite pain for ~everyone who wanted to manipulate computers into doing useful things, and I’m glad it’s over.”

While those within the industry do have motivations to hype up their own tools, there is a growing consensus that the industry has already been fundamentally changed by the rise of AI coding tools.

“The whole way people build software has changed; software is not like what it used to be,” Himanshu Tyagi, co-founder of open-source AGI company Sentient, told Fortune. “A large part of the code that will be shipped over the next 10 years will be written by AI…[Anthropic’s] Claude Code is the breakthrough product that has made that happen.”

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