The Multilingual Quality Cliff: Why Your LLM Works Great in English and Quietly Fails Everyone Else
Your LLM passes every eval you throw at it. Latency is solid, accuracy looks fine, and the team ships with confidence. Then a user in Cairo files a bug: the structured extraction returns malformed JSON. A developer in Seoul notices the assistant ignores complex instructions after a few turns. A product manager in Mumbai realizes the chatbot's summarization is just wrong—subtly, consistently, wrong.
None of this showed up in your benchmarks because your benchmarks are in English.
This is the multilingual quality cliff: a performance drop that is steep, systematic, and almost universally invisible to teams that ship AI products. The gap isn't marginal. In long multi-turn conversations, Arabic and Korean users see accuracy around 40.8% on tasks where English users are at 54.8%—a 14-point gap that compounds with every additional turn. For structured editing tasks, that same gap widens to catastrophic: 32–37% accuracy versus acceptable English performance. The users feel this. Your dashboards don't.
