FactArticle

At Anthropic, traditional product requirement documents have been replaced by prototypes, and the vast majority of code — including nearly all of Claude Code itself — is now generated by Claude.

Boris Cherny revealed that Anthropic has largely abandoned PRDs in favor of prototypes, with Claude generating close to 100% of Claude Code and 70-90% of all internal code. ✦ AI generated

Boris Cherny · The Pragmatic Engineer · 2026-06-23 · original ↗

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Product requirement documents (PRDs) are dead & prototypes have replaced them inside Anthropic. ~100% of Claude Code was generated by Claude in March. ~70-90% of code inside Anthropic was generated by Claude.

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▦ Anthropic ✳ Claude Code ◉ Boris Cherny

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Evidence · 1

Claude Tag now writes 65% of the product team's code at Anthropic, including most of what built Claude Tag itself, after a year of internal dogfooding.Anthropic Claude Code team (@ClaudeDevs) · Latent Space · conf 60%

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This moment responds to

gives example → AI coding models have become good enough since summer 2025 that resisting letting them write code directly no longer makes sense, reversing the author's prior stance.David Heinemeier Hansson · The Pragmatic Engineer