diff --git a/Changelog.md b/Changelog.md
index bb478fc..989a073 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added [METEOR](models/denkowski2014/Readme.md)
 - Added a role question generator from [Pyatkin et al. (2021)](models/pyatkin2021/Readme.md)
 - Added using [Prism](models/thompson2020/Readme.md) as an MT model
+- Added [COMET](models/rei2020/Readme.md)
 
 ### Fixed
 - Fixed an error in [Lite3Pyramid](models/zhang2021/Readme.md) by updating to a newer version of the code.
diff --git a/Papers.md b/Papers.md
index 8dfcc1d..ac6d85a 100644
--- a/Papers.md
+++ b/Papers.md
@@ -30,6 +30,7 @@ This file contains a list of the papers with models wrapped by this library.
 |[SUPERT: Towards New Frontiers in Unsupervised Evaluation Metrics for Multi-Document Summarization](https://arxiv.org/abs/2005.03724)|Yang Gao, Wei Zhao, and Steffen Eger|[Link](models/gao2020/Readme.md)|
 |[Fill in the BLANC: Human-free quality estimation of document summaries](https://aclanthology.org/2020.eval4nlp-1.2/)|Oleg Vasilyev, Vedant Dharnidharka, and John Bohannon|[Link](models/vasilyev2020/Readme.md)|
 |[Meteor Universal: Language Specific Translation Evaluation for Any Target Language](https://aclanthology.org/W14-3348/)|Michael Denkowski and Alon Lavie|[Link](models/denkowski2014/Readme.md)|
+|[COMET: A Neural Framework for MT Evaluation](https://aclanthology.org/2020.emnlp-main.213/)|Ricardo Rei, Craig Stewart, Ana C Farinha, and Alon Lavie|[Link](models/rei2020/Readme.md)|
 
 ### Question Answering
 |Paper|Authors|Link|
diff --git a/models/rei2020/Dockerfile b/models/rei2020/Dockerfile
new file mode 100644
index 0000000..65e1329
--- /dev/null
+++ b/models/rei2020/Dockerfile
@@ -0,0 +1,11 @@
+FROM pure/python:3.7-cuda10.0-base
+
+WORKDIR /app
+
+# Install the library
+RUN pip install --upgrade pip && \
+    pip install --no-cache-dir unbabel-comet==1.0.1 --use-feature=2020-resolver
+
+# Run a warmup query
+COPY scripts/warmup.sh warmup.sh
+RUN sh warmup.sh
\ No newline at end of file
diff --git a/models/rei2020/Readme.md b/models/rei2020/Readme.md
new file mode 100644
index 0000000..c1e9ab7
--- /dev/null
+++ b/models/rei2020/Readme.md
@@ -0,0 +1,59 @@
+# Rei et al. (2020)
+
+## Publication
+[COMET: A Neural Framework for MT Evaluation](https://aclanthology.org/2020.emnlp-main.213/)
+
+## Repositories
+https://github.com/Unbabel/COMET
+
+## Available Models
+The available models are COMET using the reference-based `wmt20-comet-da` model or the reference-free `wmt20-comet-qe-da` model. 
+
+- COMET:
+  - Description: A machine translation evaluation metric.
+  - Name: `rei2020-comet`
+  - Usage:
+    ```python
+    from repro.models.rei2020 import COMET
+    model = COMET()
+    # reference-based
+    inputs = [
+        {"candidate": "The candidate to score", "sources": ["The source text"], "reference": ["The reference"]}
+    ]
+    macro, micro = model.predict_batch(inputs)
+    
+    # reference-free
+    inputs = [
+        {"candidate": "The candidate to score", "sources": ["The source text"]}
+    ]
+    macro, micro = model.predict_batch(inputs)
+    ```
+    The `macro` and `micro` are the averaged and input-level COMET scores.
+    The reference-based key is `"comet"` and the reference-free key is `"comet-src"`.
+    
+## Implementation Notes
+Only 1 source document and 1 reference translation are supported.
+    
+## Docker Information
+- Image name: `danieldeutsch/rei2020:1.0`
+- Build command:
+  ```shell script
+  repro setup rei2020
+  ```
+- Requires network: Yes, the code still makes a network request even if the models are pre-cached.
+  
+## Testing
+```shell script
+repro setup rei2020
+pytest models/rei2020/tests
+```
+
+## Status
+- [x] Regression unit tests pass  
+See [here](https://github.com/danieldeutsch/repro/actions/runs/1567865901) 
+- [ ] Correctness unit tests pass  
+- [ ] Model runs on full test dataset  
+- [ ] Predictions approximately replicate results reported in the paper  
+- [ ] Predictions exactly replicate results reported in the paper  
+
+## Changelog
diff --git a/models/rei2020/scripts/warmup.sh b/models/rei2020/scripts/warmup.sh
new file mode 100644
index 0000000..ff39049
--- /dev/null
+++ b/models/rei2020/scripts/warmup.sh
@@ -0,0 +1,12 @@
+# Examples taken from https://github.com/Unbabel/COMET
+echo -e "Dem Feuer konnte Einhalt geboten werden\nSchulen und Kindergärten wurden eröffnet." >> src.de
+echo -e "The fire could be stopped\nSchools and kindergartens were open" >> hyp1.en
+echo -e "They were able to control the fire.\nSchools and kindergartens opened" >> ref.en
+
+# Run a reference-based version
+comet-score -s src.de -t hyp1.en -r ref.en --gpus 0
+
+# Run a reference-free version
+comet-score -s src.de -t hyp1.en --gpus 0 --model wmt20-comet-qe-da
+
+rm src.de hyp1.en ref.en
\ No newline at end of file
diff --git a/models/rei2020/tests/__init__.py b/models/rei2020/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/models/rei2020/tests/model_test.py b/models/rei2020/tests/model_test.py
new file mode 100644
index 0000000..01a17f0
--- /dev/null
+++ b/models/rei2020/tests/model_test.py
@@ -0,0 +1,62 @@
+import unittest
+from parameterized import parameterized
+
+from repro.models.rei2020 import COMET
+from repro.testing import assert_dicts_approx_equal, get_testing_device_parameters
+
+
+class TestRei2020Models(unittest.TestCase):
+    @parameterized.expand(get_testing_device_parameters())
+    def test_comet_regression(self, device: int):
+        # Tests the examples from the Github repo
+        model = COMET(device=device)
+
+        inputs = [
+            {
+                "sources": ["Dem Feuer konnte Einhalt geboten werden"],
+                "candidate": "The fire could be stopped",
+                "references": ["They were able to control the fire."],
+            },
+            {
+                "sources": ["Schulen und Kindergärten wurden eröffnet."],
+                "candidate": "Schools and kindergartens were open",
+                "references": ["Schools and kindergartens opened"],
+            },
+        ]
+
+        expected_macro = {"comet": 0.5529156997799873}
+        expected_micro = [{"comet": 0.19016893208026886}, {"comet": 0.9156624674797058}]
+        actual_macro, actual_micro = model.predict_batch(inputs)
+
+        assert_dicts_approx_equal(expected_macro, actual_macro)
+        assert len(expected_micro) == len(actual_micro)
+        for expected, actual in zip(expected_micro, actual_micro):
+            assert_dicts_approx_equal(expected, actual, abs=1e-4)
+
+    @parameterized.expand(get_testing_device_parameters())
+    def test_comet_src_regression(self, device: int):
+        # Tests the examples from the Github repo
+        model = COMET(device=device)
+
+        inputs = [
+            {
+                "sources": ["Dem Feuer konnte Einhalt geboten werden"],
+                "candidate": "The fire could be stopped",
+            },
+            {
+                "sources": ["Schulen und Kindergärten wurden eröffnet."],
+                "candidate": "Schools and kindergartens were open",
+            },
+        ]
+
+        expected_macro = {"comet-src": 0.35479202680289745}
+        expected_micro = [
+            {"comet-src": 0.00831037387251854},
+            {"comet-src": 0.7012736797332764},
+        ]
+        actual_macro, actual_micro = model.predict_batch(inputs)
+
+        assert_dicts_approx_equal(expected_macro, actual_macro)
+        assert len(expected_micro) == len(actual_micro)
+        for expected, actual in zip(expected_micro, actual_micro):
+            assert_dicts_approx_equal(expected, actual, abs=1e-4)
diff --git a/repro/models/rei2020/__init__.py b/repro/models/rei2020/__init__.py
new file mode 100644
index 0000000..a33eecf
--- /dev/null
+++ b/repro/models/rei2020/__init__.py
@@ -0,0 +1,10 @@
+import os
+
+VERSION = "1.0"
+MODEL_NAME = os.path.basename(os.path.dirname(__file__))
+DOCKERHUB_REPO = f"danieldeutsch/{MODEL_NAME}"
+DEFAULT_IMAGE = f"{DOCKERHUB_REPO}:{VERSION}"
+AUTOMATICALLY_PUBLISH = True
+
+from repro.models.rei2020.model import COMET
+from repro.models.rei2020.setup import Rei2020SetupSubcommand
diff --git a/repro/models/rei2020/model.py b/repro/models/rei2020/model.py
new file mode 100644
index 0000000..109be85
--- /dev/null
+++ b/repro/models/rei2020/model.py
@@ -0,0 +1,124 @@
+import json
+import logging
+from typing import Dict, List, Tuple, Union
+
+from repro.common import util
+from repro.common.docker import DockerContainer
+from repro.common.io import write_to_text_file
+from repro.data.types import MetricsType, TextType
+from repro.models import Model
+from repro.models.rei2020 import DEFAULT_IMAGE, MODEL_NAME
+
+logger = logging.getLogger(__name__)
+
+
+@Model.register(f"{MODEL_NAME}-comet")
+class COMET(Model):
+    def __init__(self, image: str = DEFAULT_IMAGE, device: int = 0):
+        self.image = image
+        self.device = device
+
+    def predict(
+        self,
+        candidate: TextType,
+        sources: List[TextType] = None,
+        references: List[TextType] = None,
+        batch_size: int = None,
+    ) -> MetricsType:
+        return self.predict_batch(
+            [{"candidate": candidate, "sources": sources, "references": references}],
+            batch_size=batch_size,
+        )[0]
+
+    def predict_batch(
+        self,
+        inputs: List[Dict[str, Union[TextType, List[TextType]]]],
+        batch_size: int = None,
+    ) -> Tuple[MetricsType, List[MetricsType]]:
+        logger.info(f"Calculating COMET for {len(inputs)} inputs")
+
+        batch_size = batch_size or 8
+
+        candidates = [inp["candidate"] for inp in inputs]
+        sources_list = [inp["sources"] if "sources" in inp else None for inp in inputs]
+        references_list = [
+            inp["references"] if "references" in inp else None for inp in inputs
+        ]
+
+        # If any input has a reference, they all must
+        def _has_references(references: List[TextType]) -> bool:
+            return references is not None and len(references) > 0
+
+        has_references = any(
+            _has_references(references) for references in references_list
+        )
+        if has_references:
+            if not all(_has_references(references) for references in references_list):
+                raise Exception(
+                    f"COMET requires all or none of the inputs have references"
+                )
+
+        # COMET only supports single sources and references
+        sources = util.check_for_single_texts(sources_list)
+        if has_references:
+            references = util.check_for_single_texts(references_list)
+
+        # Ensure all are strings or None
+        candidates = [util.flatten(candidate) for candidate in candidates]
+        sources = [util.flatten(source) for source in sources]
+        if has_references:
+            references = [util.flatten(reference) for reference in references]
+
+        with DockerContainer(self.image) as backend:
+            host_src_file = f"{backend.host_dir}/src.txt"
+            container_src_file = f"{backend.container_dir}/src.txt"
+            write_to_text_file(sources, host_src_file)
+
+            hyp_filename = f"hyp1.txt"
+            host_hyp_file = f"{backend.host_dir}/{hyp_filename}"
+            container_hyp_file = f"{backend.container_dir}/{hyp_filename}"
+            write_to_text_file(candidates, host_hyp_file)
+
+            host_ref_file = f"{backend.host_dir}/ref.txt"
+            container_ref_file = f"{backend.container_dir}/ref.txt"
+            if has_references:
+                write_to_text_file(references, host_ref_file)
+
+            host_output_file = f"{backend.host_dir}/output.json"
+            container_output_file = f"{backend.container_dir}/output.json"
+
+            cuda = self.device != -1
+            commands = []
+            if cuda:
+                commands.append(f"export CUDA_VISIBLE_DEVICES={self.device}")
+                num_gpus = 1
+            else:
+                num_gpus = 0
+
+            score_command = (
+                f"comet-score "
+                f"-s {container_src_file} "
+                f"-t {container_hyp_file} "
+                f"--gpus {num_gpus} "
+                f"--batch_size {batch_size} "
+                f"--to_json {container_output_file}"
+            )
+            if has_references:
+                score_command += f" -r {container_ref_file} --model wmt20-comet-da"
+            else:
+                score_command += " --model wmt20-comet-qe-da"
+            commands.append(score_command)
+
+            command = " && ".join(commands)
+            backend.run_command(command=command, cuda=cuda, network_disabled=False)
+
+            output_dict = json.load(open(host_output_file, "r"))
+            outputs = output_dict[container_hyp_file]
+
+            metric = "comet" if has_references else "comet-src"
+
+            micro = []
+            for output in outputs:
+                micro.append({metric: output["COMET"]})
+            macro = util.average_dicts(micro)
+            return macro, micro
diff --git a/repro/models/rei2020/setup.py b/repro/models/rei2020/setup.py
new file mode 100644
index 0000000..62f7a9a
--- /dev/null
+++ b/repro/models/rei2020/setup.py
@@ -0,0 +1,10 @@
+from repro import MODELS_ROOT
+from repro.commands.subcommand import SetupSubcommand
+from repro.common.docker import BuildDockerImageSubcommand
+from repro.models.rei2020 import DEFAULT_IMAGE, MODEL_NAME
+
+
+@SetupSubcommand.register(MODEL_NAME)
+class Rei2020SetupSubcommand(BuildDockerImageSubcommand):
+    def __init__(self) -> None:
+        super().__init__(f"{MODELS_ROOT}/{MODEL_NAME}", DEFAULT_IMAGE)