Expired75% confidenceFactTime unknown
In a Y Combinator talk, approximately half of the founders stated that 100% of their code was written using Claude Code.
1
Sources
75%
Confidence
Medium-term (~90 days)
Relevance
5/31/2026
First Seen
Valid until: 8/29/2026(expired)
Sources
Related Entities
Related Claims
VerifiedClaude Code is 100% written by Claude Code itself, and Cowork is 100% written by Claude Code.75% similarPartially VerifiedWithin Anthropic, 80% to 90% of code is written by Claude Code, and an increasing number of teams have reached 100%72% similarUnverifiedClaude 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.68% similarUnverifiedRoss Mike used Claude Code to build a complete web code review tool (webcheck.run) in approximately 4 hours, with 70% of the code written by Claude Code.67% similarUnverified95% of engineers at Anthropic use Claude Code on a daily basis.67% similar
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