TL;DR
On Dec. 27, 2025, a user identified as Boris Cherny tweeted that, over the past 30 days, every contribution he made to a project called Claude Code was authored by Claude Code. The post recorded substantial visibility on Twitter and drew replies and other engagement.
What happened
On December 27, 2025, a Twitter user named Boris Cherny posted a brief statement saying that in the preceding 30 days, 100% of his contributions to something called “Claude Code” were written by Claude Code. The message appears as a direct, single-line declaration: "Correct. In the last thirty days, 100% of my contributions to Claude Code were written by Claude Code." The tweet shows notable distribution metrics on the platform, including roughly 68,000 views and multiple engagements. The post prompted replies and further conversation on the social network; the provided source shows there were replies but does not include follow-up comments or clarifying context from Cherny within the excerpt. No additional documentation, commit logs, or external confirmation are included in the source material.
Why it matters
- Raises questions about authorship and attribution when developers use AI to generate code.
- Touches on traceability: stakeholders often need to know who wrote or reviewed code for security and compliance.
- Highlights the growing role of AI tools in day-to-day development workflows.
- Could have implications for licensing, maintainability and project governance if code authorship is automated.
Key facts
- The statement was posted on Twitter by a user named Boris Cherny.
- Cherny wrote that in the last 30 days, 100% of his contributions to "Claude Code" were written by Claude Code.
- The tweet timestamp is Dec. 27, 2025, at 12:48 PM (as shown in the source).
- The post displayed roughly 68,000 views on the platform at the time the source was captured.
- The tweet received replies and other forms of engagement; the source lists replies and engagement counts but provides no further detail.
- The source contains only the single-line declaration and engagement metadata; no code, commit history, or verification is attached.
What to watch next
- not confirmed in the source: any follow-up clarification or public statement from Boris Cherny about how Claude Code was used or integrated.
- not confirmed in the source: responses or statements from other contributors to Claude Code or maintainers of the project.
- not confirmed in the source: whether project repositories, commit histories or contribution logs will be disclosed to verify authorship claims.
Quick glossary
- AI-assisted coding: Use of artificial intelligence tools to generate, complete or suggest source code for developers.
- Authorship: Designation of who created a piece of work; in software, often tracked through commits, licenses and contributor records.
- Commit / Contribution: A change or addition submitted to a codebase, typically recorded in version control systems.
- Tweet: A short message posted on the social media platform Twitter (now X), often used for public statements and updates.
Reader FAQ
Did Claude actually write all the code for Claude Code?
Not confirmed in the source. The claim appears only as a tweet and is not independently verified in the provided material.
Who is Boris Cherny and what is Claude Code?
Not confirmed in the source. The tweet identifies the poster as Boris Cherny and references "Claude Code" but provides no background or definitions.
Is there proof, such as commit logs or repository records, backing the claim?
Not confirmed in the source. The excerpt contains only the tweet text and engagement metrics.
What was the community reaction?
Not confirmed in the source. The tweet shows engagement and replies, but their content and tone are not provided.
Boris Cherny @bcherny Correct. In the last thirty days, 100% of my contributions to Claude Code were written by Claude Code 12:48 PM · Dec 27, 2025 · 68K Views…
Sources
- Claude Code creator says Claude wrote all his code for the last month
- Claude Code creator says Claude wrote all his code for the …
- When I created Claude Code as a side project back in …
- Claude Code's creator explains the limits of vibe coding
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