Expired50% confidenceFactTime unknown
Claude Code creator Boris's entire contribution to the codebase within 30 days—40,000 lines of new code and 259 PRs—was 100% written by Claude Code.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Related Claims
VerifiedClaude Code is 100% written by Claude Code itself, and Cowork is 100% written by Claude Code.80% similarUnverifiedClaude Code has been installed 29 million times on VS Code alone75% similarUnverified40% of the code in Anthropic's Claude Code open-source repository is related to the Harness.75% similarUnverifiedThe Anthropic team recently completed a large-scale refactoring project involving 22,000 lines of code changes, with the majority of the codebase written by Claude.73% similarVerifiedClaude Code has more than 510,000 lines of code.72% similar
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