We’ve developed and open sourced TransCoder , an entirely self-supervised neural transcompiler system that can make code migration far easier and more efficient. Our method is the first AI system able to translate code from one programming language to another without requiring parallel data for training. We’ve demonstrated that TransCoder can successfully translate functions between C++, Java, and Python 3. TransCoder outperforms open source and commercial rule-based translation programs. In our evaluations, the model correctly translates more than 90 percent of Java functions to C++, 74.8 percent of C++ functions to Java, and 68.7 percent of functions from Java to Python. In comparison, a commercially available tool translates only 61.0 percent of functions correctly from C++ to Java, and an open source translator is accurate for only 38.3 percent of Java functions translated into C++.