diff --git a/gptc/__init__.py b/gptc/__init__.py
index f4d36d5..6ef26b3 100644
--- a/gptc/__init__.py
+++ b/gptc/__init__.py
@@ -4,6 +4,7 @@
 
 from gptc.compiler import compile as compile
 from gptc.classifier import Classifier as Classifier
+from gptc.pack import pack as pack
 from gptc.exceptions import (
     GPTCError as GPTCError,
     ModelError as ModelError,
diff --git a/gptc/__main__.py b/gptc/__main__.py
index dc14d18..0f64989 100644
--- a/gptc/__main__.py
+++ b/gptc/__main__.py
@@ -13,7 +13,9 @@ def main() -> None:
     )
     subparsers = parser.add_subparsers(dest="subparser_name", required=True)
 
-    compile_parser = subparsers.add_parser("compile", help="compile a raw model")
+    compile_parser = subparsers.add_parser(
+        "compile", help="compile a raw model"
+    )
     compile_parser.add_argument("model", help="raw model to compile")
     compile_parser.add_argument(
         "--max-ngram-length",
@@ -46,14 +48,22 @@ def main() -> None:
         action="store_true",
     )
 
+    pack_parser = subparsers.add_parser(
+        "pack", help="pack a model from a directory"
+    )
+    pack_parser.add_argument("model", help="directory containing model")
+
     args = parser.parse_args()
 
-    with open(args.model, "r") as f:
-        model = json.load(f)
-
     if args.subparser_name == "compile":
+        with open(args.model, "r") as f:
+            model = json.load(f)
+
         print(json.dumps(gptc.compile(model, args.max_ngram_length)))
-    else:
+    elif args.subparser_name == "classify":
+        with open(args.model, "r") as f:
+            model = json.load(f)
+
         classifier = gptc.Classifier(model, args.max_ngram_length)
 
         if sys.stdin.isatty():
@@ -65,6 +75,8 @@ def main() -> None:
             print(classifier.classify(text))
         else:
             print(json.dumps(classifier.confidence(text)))
+    else:
+        print(json.dumps(gptc.pack(args.model, True)[0]))
 
 
 if __name__ == "__main__":
diff --git a/gptc/classifier.py b/gptc/classifier.py
index 2469ff3..d4cd1dc 100755
--- a/gptc/classifier.py
+++ b/gptc/classifier.py
@@ -27,7 +27,9 @@ class Classifier:
 
     def __init__(self, model: gptc.compiler.MODEL, max_ngram_length: int = 1):
         if model.get("__version__", 0) != 3:
-            raise gptc.exceptions.UnsupportedModelError(f"unsupported model version")
+            raise gptc.exceptions.UnsupportedModelError(
+                f"unsupported model version"
+            )
         self.model = model
         model_ngrams = cast(int, model.get("__ngrams__", 1))
         self.max_ngram_length = min(max_ngram_length, model_ngrams)
diff --git a/gptc/compiler.py b/gptc/compiler.py
index fd4c12e..05b793b 100755
--- a/gptc/compiler.py
+++ b/gptc/compiler.py
@@ -8,7 +8,9 @@ CONFIG_T = Union[List[str], int, str]
 MODEL = Dict[str, Union[WEIGHTS_T, CONFIG_T]]
 
 
-def compile(raw_model: Iterable[Mapping[str, str]], max_ngram_length: int = 1) -> MODEL:
+def compile(
+    raw_model: Iterable[Mapping[str, str]], max_ngram_length: int = 1
+) -> MODEL:
     """Compile a raw model.
 
     Parameters
@@ -47,9 +49,13 @@ def compile(raw_model: Iterable[Mapping[str, str]], max_ngram_length: int = 1) -
         categories_by_count[category] = {}
         for word in text:
             try:
-                categories_by_count[category][word] += 1 / len(categories[category])
+                categories_by_count[category][word] += 1 / len(
+                    categories[category]
+                )
             except KeyError:
-                categories_by_count[category][word] = 1 / len(categories[category])
+                categories_by_count[category][word] = 1 / len(
+                    categories[category]
+                )
     word_weights: Dict[str, Dict[str, float]] = {}
     for category, words in categories_by_count.items():
         for word, value in words.items():
@@ -63,7 +69,9 @@ def compile(raw_model: Iterable[Mapping[str, str]], max_ngram_length: int = 1) -
         total = sum(weights.values())
         new_weights: List[int] = []
         for category in names:
-            new_weights.append(round((weights.get(category, 0) / total) * 65535))
+            new_weights.append(
+                round((weights.get(category, 0) / total) * 65535)
+            )
         model[word] = new_weights
 
     model["__names__"] = names
diff --git a/utils/pack.py b/gptc/pack.py
similarity index 69%
rename from utils/pack.py
rename to gptc/pack.py
index b2f7589..4177ad8 100644
--- a/utils/pack.py
+++ b/gptc/pack.py
@@ -2,10 +2,9 @@
 
 import sys
 import os
-import json
 
 
-def pack(directory, print_exceptions=True):
+def pack(directory, print_exceptions=False):
     paths = os.listdir(directory)
     texts = {}
     exceptions = []
@@ -13,9 +12,9 @@ def pack(directory, print_exceptions=True):
     for path in paths:
         texts[path] = []
         try:
-            for file in os.listdir(os.path.join(sys.argv[1], path)):
+            for file in os.listdir(os.path.join(directory, path)):
                 try:
-                    with open(os.path.join(sys.argv[1], path, file)) as f:
+                    with open(os.path.join(directory, path, file)) as f:
                         texts[path].append(f.read())
                 except Exception as e:
                     exceptions.append((e,))
@@ -32,10 +31,3 @@ def pack(directory, print_exceptions=True):
         raw_model += [{"category": category, "text": i} for i in cat_texts]
 
     return raw_model, exceptions
-
-
-if len(sys.argv) != 2:
-    print("usage: pack.py <path>", file=sys.stderr)
-    exit(1)
-
-print(json.dumps(pack(sys.argv[1])[0]))