Report: ByteDance to Broadly Restrict Employees' Internal Personal-Paid Use of Claude, Codex and Others
According to a tip from Dachang Ribao on November 3, ByteDance will broadly restrict the internal use of personal accounts for Claude, Codex and others; the notice, issued last week, sparked internal discussion. ByteDance Technical Vice President Hong Dingkun responded on the internal network that once L3-and-above content leaks, the consequences are very serious, and held that promoting a product should not rely on banning other options to force usage. Previously, in May 2025, ByteDance's security and risk control department had announced that starting June 30, 2025, third-party AI development software such as Cursor and Windsurf would be banned in batches, with Trae as the replacement.
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The tip and the internal-network response reveal the specific scope of ByteDance's tightening of external AI tools, which can be compared with last year's actions such as banning Cursor to examine corporate data boundaries.
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ByteDance Reportedly to Broadly Restrict Employees' Internal Personal-Paid Use of Claude, Codex and Others
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The report also said 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, such as "once L3 and above content is leaked, the consequences are very serious" and "promoting a product does not require banning other options and forcing people to use it, because that effect is very poor."
According to an August report by The Information this year, ByteDance founder Zhang Yiming clearly stated at the Seed team all-hands meeting last month that even if it means temporarily lagging behind competitors, the company will not rely on AI distillation technology to improve its models.
Extended reading
In ByteDance's job-level system, L4 usually corresponds to the former 3-1 level, belonging to a team TL or junior manager, and is the dividing line between core technical backbone and managers. The L4-level code repository has nearly accumulated the core assets and underlying architecture of the company's 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 from June 30, 2025, it would ban third-party AI development software in batches internally, including AI programming tools Cursor, Windsurf and others, and would use its programming assistant Trae as an alternative. This time, expanding the scope of the ban to the L4 code repository and Feishu documents is a further tightening of the space for external AI use.