Anthropic's Claude Code Accelerates Developer Workflows

Anthropic's Claude Code now writes 90% of the company's own codebase, boosting engineer output by 200% and shifting bottlenecks to code review. The tool's Code Review product increased substantive pull request comments from 16% to 54%, and an internal Slack channel receives a new message every 5 to 10 minutes, with Claude Code autonomously fixing issues before human engineers can respond.

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.