IT Home November 4 news, according to a November 3 report by Big Company Daily Explosions, ByteDance has a new rule: it will broadly restrict internal use of personal accounts for Claude, Codex, and similar tools.
The report says that starting this month, ByteDance will impose an external AI access ban on all L4-level code repositories and Feishu documents, covering the entire company; AI accounts personally purchased by employees can no longer be used.
The report also says that after the notice was issued last week, it sparked some internal discussion, and ByteDance technology vice president Hong Dingkun also gave a detailed response on the internal network, for example, “once L3 and above content leaks, the consequences are very serious,” and “promoting a product does not require banning other options and forcing people to use it, because that approach works very poorly.”
According to a report by The Information in August this year, ByteDance founder Zhang Yiming clearly stated at the Seed team all-hands meeting last month that even if it means temporarily falling behind competitors, the company will not rely on AI distillation technology to improve its models.
Further Reading
In ByteDance’s job-level system, L4 usually corresponds to the former 3-1 level, belonging to team TLs or junior managers, and is the dividing line between core technical backbone and managers. L4-level code repositories have concentrated almost all the company’s core assets and underlying architecture across its entire line of business, which is also why this ban is highly valued internally.
This is not the first time ByteDance has tightened the use of external AI tools. In May 2025, ByteDance’s security and risk control department issued an email stating that, out of consideration for preventing data leakage risks, starting June 30, 2025, it would internally disable third-party AI development software in batches, including AI programming tools such as Cursor and Windsurf, and would use its own programming assistant Trae as an alternative. This expansion of the ban to L4 code repositories and Feishu documents further tightens the space for external AI use.