Anthropic's Claude Code Accelerates Developer Workflows

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.