Which AI translation breakthrough in 2016 reduced translation errors by 60% overnight and is now used by most major language service providers?

Artificial intelligence has transformed language translation services over the past decade. Neural machine translation models have revolutionized the way companies provide cross-language services, with significant implications for global commerce, education, and communication. This trivia question focuses on a major milestone in the development of AI translation technology that changed the industry landscape.

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Google's Neural Machine Translation (GNMT)
OpenAI's GPT-1 Translation Module
Microsoft's BiLingual Embedding (MBE) System
IBM's Watson Linguistic Processing Framework