ByteDance implements broad restrictions on internal use of external AI tools like Claude and Codex

ByteDance is reportedly enforcing new internal regulations that will significantly limit the use of personal AI accounts for tools such as Claude and Codex. Effective this month, the company plans to block external AI access across all L4-level code repositories and Feishu documents company-wide, prohibiting the use of privately purchased AI accounts. This directive follows internal discussions, during which ByteDance Technology Vice President Hong Dingkun commented on the severity of potential data leaks, stating that consequences for L3 and above content leakage would be extremely serious, and criticizing forced adoption methods as ineffective. Previously, in May 2025, ByteDance's security and risk control department had begun phasing out third-party AI development software, including Cursor and Windsurf, starting June 30, 2025, substituting them with its internal assistant Trae. The current expansion to cover L4 codebases and Feishu documents represents a further tightening of external AI usage. Furthermore, The Information reported in August of this year that ByteDance founder Zhang Yiming had stated during a Seed team meeting last month that the company would not rely on AI distillation techniques to improve its models, even if it meant temporarily lagging behind competitors.