Anthropic leaks part of Claude Code’s internal source code

Anthropic leaks part of Claude Code’s internal source code
Published Tue, Mar 31 20264:56 PM EDT

Ashley Capoot@/in/ashley-capoot/
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Key Points
Anthropic accidentally leaked part of the internal source code for its coding assistant Claude Code, according to a spokesperson.
The leak could help give software developers, and Anthropic’s competitors, insight into how it built the viral coding tool.
“No sensitive customer data or credentials were involved or exposed,” the spokesperson said.


The Anthropic logo appears on a smartphone screen with multiple Claude AI logos in the background. Following the release of Claude Opus 4.6 on February 5, Anthropic continues to challenge its main competitors in the generative AI market in Creteil, France, on February 6, 2026.
Samuel Boivin | Nurphoto | Getty Images


Anthropic leaked part of the internal source code for its popular artificial intelligence coding assistant, Claude Code, the company confirmed on Tuesday.

“No sensitive customer data or credentials were involved or exposed,” an Anthropic spokesperson said in a statement. “This was a release packaging issue caused by human error, not a security breach. We’re rolling out measures to prevent this from happening again.”


A source code leak is a blow to the startup, as it could help give software developers, and Anthropic’s competitors, insight into how it built its viral coding tool. A post on X with a link to Anthropic’s code has amassed more than 21 million views since it was shared at 4:23 a.m. ET on Tuesday.

The leak also marks Anthropic’s second major data blunder in under a week. Descriptions of Anthropic’s upcoming AI model and other documents were recently discovered in a publicly accessible data cache, according to a report from Fortune on Thursday.


Anthropic was founded by a group of former OpenAI executives and researchers in 2021, and it’s best known for developing a family of AI models called Claude.

The company released Claude Code to the general public in May, and it helps software developers build features, fix bugs and automate tasks.

Claude Code has seen massive adoption over the last year, and its run-rate revenue had swelled to more than $2.5 billion as of February.


The tool’s success has prompted companies like OpenAI, Google and xAI to pour resources into developing competing offerings.