Meta Internally Restricts Engineers from Using Claude Code and Codex to Prevent 'Distillation Trap'

According to MarsBit, Meta has recently implemented internal restrictions prohibiting engineers from freely using external AI coding models such as Claude Code and Codex. The move is designed to prevent the outputs of these external models from infiltrating the training and evaluation data pipeline of Meta's self-developed AI coding assistant, MetaCode, thereby avoiding the so-called 'distillation trap' — the unintended replication of competitor model capabilities. Additionally, this restriction helps reduce the high costs associated with AI usage.