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Claude Developers: Claude writes about 90% of Claude Code's code; a new post explains the code review changes behind it

Posted on X by Claude Developers (@ClaudeDevs) on 16 October 2026. The headline is our summary; the post itself is quoted below.

Claude Developers@ClaudeDevs ·

Claude writes about 90% of Claude Code's code. From June to September, merged PRs more than doubled while the share reverted fell by more than…

The quote is the post as published on X; the original may include images, links or a thread.

Context

  • Claude Code 2.1.302Released the same day (UTC). Added CLAUDE_CODE_AUTO_MODE_MODEL to choose the model the client-side auto mode classifier uses; it does not change the model for server-side auto mode · and more
  • AI news in October 2026The month in one page: posts, releases, resets and blog posts.
  • All Claude newsSelected posts, newest first.