Fix the Error, Not the Translation: Two-Stage LLM Post-Editing for Domain MT
TL;DR for operators When a translation is already mostly correct, another broad LLM rewrite can create new problems faster than it removes the remaining one. In Wang and Wu’s domain-specific machine-translation study,1 an initial EN→DE post-edit reached 89.93 COMET-22. Six of seven tested second-round editors failed to improve that result; five lowered it, one left it unchanged, and only reusing Claude Sonnet 4.5 produced a small increase to 90.07. ...