# Anthropic's Claude Code Accelerates Developer Workflows > Source: > Published: 2026-07-03 19:39:32+00:00 **Cat Wu**, who leads product for **Claude Code** and Cowork at **Anthropic**, said **90%** of Anthropic's own codebase is now written by `Claude Code`, according to an O'Reilly Radar writeup of her fireside chat with Addy Osmani at O'Reilly's AI Codecon. Per O'Reilly, Anthropic engineers are producing roughly **200%** more code than a year earlier, which shifted the team's bottleneck to code review; Anthropic's own separately released **Code Review** product reports substantive review comments on pull requests rose from **16% to 54%** after rollout. The article also describes an internal dogfooding Slack channel that gets a new message every **5 to 10 minutes**, and recounts an episode where a scheduled `Claude Code` task scanned that channel and opened a pull request to fix an issue before a human engineer got to it.