COMET: High-quality Machine Translation Evaluation

COMET by Unbabel

What is COMET

COMET is an open-source framework for MT evaluation that can be used for two purposes:

  • To evaluate MT systems with our currently available high-performing metrics (check: COMET Metrics).

  • To train and develop new metrics.



Free software: Apache License 2.0


We welcome contributions to improve COMET. Please refer to for quick instructions or to contributing instructions for more detailed instructions on how to set up your development environment.