TL;DR
Senior engineers at Anthropic and OpenAI say AI now writes 100% of their code. While industry-wide figures are lower — around 30% at Microsoft and Salesforce — Anthropic’s company-wide average sits between 70% and 90%, with its Claude Code tool writing about 90% of its own codebase.
No More Manual Coding
Boris Cherny, head of Anthropic’s Claude Code, says he hasn’t written any code by hand in over two months. “I shipped 22 PRs yesterday and 27 the day before, each one 100% written by Claude,” he posted on X. An OpenAI researcher using the pseudonym Roon made a similar claim: “100%, I don’t write code anymore.”
Anthropic CEO Dario Amodei echoed these sentiments at Davos, predicting the industry may be six to twelve months away from AI handling most software engineering work from start to finish.
The Numbers Vary Widely
Outside the leading AI labs, adoption rates tell a different story. Microsoft reports about 30% of its code is AI-generated. A study published in Science found roughly 29% of GitHub Python functions in the US are now AI-written, with lower figures elsewhere.
Anthropic’s company-wide figure sits between 70% and 90%, according to a spokesperson. Cherny believes the rest of the industry will reach similar levels “in the coming months.”
What It Means for Jobs
The shift is already changing hiring at Anthropic. Cherny says his team now favours generalists over specialists, since many traditional programming skills matter less when AI handles implementation. “Not all of the things people learned in the past translate to coding with LLMs,” he wrote.
Open roles for entry-level software engineers have declined as AI-generated code has increased, though multiple factors contribute to that trend. The technology still has limitations — AI researcher Andrej Karpathy notes that models can make “subtle conceptual errors” and over-complicate code.
For Cherny, the payoff is personal: “I have never had this much joy day to day in my work, because essentially all the tedious work, Claude does it, and I get to be creative.”