Recently, according to leaks from “Big Tech Daily Blast,” ByteDance has introduced a major new internal rule: the company will broadly restrict employees from using third-party personal accounts such as Claude and Codex internally at their own expense. It is reported that starting this month, ByteDance will impose an external AI access ban on all L4-level code repositories and Feishu documents across the company, and AI accounts purchased personally by employees will no longer be usable in these core areas.
Considerations for Core Asset Security and Tiered Controls
In ByteDance's internal job level system, L4 usually corresponds to the former 3-1 level, equivalent to a team TL (team leader) or junior manager, placing it at the dividing line between core technical talent and management. For this reason, L4-level code repositories have accumulated core assets and underlying architecture for nearly all of the company's business lines, which is the main reason this ban has drawn intense internal attention and been handled cautiously.
Along with the issuance of the new rule, a certain amount of internal discussion has also arisen. Technical Vice President Hong Dingkun later gave a detailed response on the internal network, noting that “once L3 and above content is leaked, the consequences are extremely serious,” while also admitting that “to promote a product, you don't need to ban other options and force people to use it, because it is very ineffective.”
Continuing the Previous Risk-Control Strategy and Further Regulating Third-Party AI Tools
In fact, this is not the first time ByteDance has tightened access to external AI development tools. As early as May 2025, ByteDance's Security and Risk Control department issued an email announcing that, based on comprehensive considerations of preventing data leakage risks, starting June 30, 2025, it would internally ban third-party AI coding software in batches, including AI coding assistants such as Cursor and Windsurf, and would offer its self-developed coding assistant Trae as an alternative. This expansion of the ban to L4 code repositories and Feishu documents marks that ByteDance is continuing to step up management in R&D security and data risk control.
