diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3eb0cea..4ae7133 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,6 +23,8 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         python-version: ['3.10']
+    env:
+      OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
 
     steps:
     - uses: actions/checkout@v3
@@ -42,4 +44,7 @@ jobs:
       run: hatch run dev:lint-types
 
     - name: Run format checking
-      run: hatch run dev:lint-format
\ No newline at end of file
+      run: hatch run dev:lint-format
+
+    - name: Run self test
+      run: hatch run docstring-auditor
diff --git a/.gitignore b/.gitignore
index 026878c..55dd9d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -164,4 +164,4 @@ cython_debug/
 package-lock.json
 package.json
 ***.draft
-
+***.DS_Store
diff --git a/docstring_auditor/main.py b/docstring_auditor/main.py
index c13d0e2..b7f42ba 100644
--- a/docstring_auditor/main.py
+++ b/docstring_auditor/main.py
@@ -54,7 +54,7 @@ def extract_functions(file_path: str) -> List[Optional[str]]:
     return functions
 
 
-def ask_for_critique(function: str) -> Dict[str, str]:
+def ask_for_critique(function: str, model: str) -> Dict[str, str]:
     """
     Query OpenAI for a critique of the docstring for a function.
 
@@ -63,6 +63,8 @@ def ask_for_critique(function: str) -> Dict[str, str]:
     function : str
         A string containing the code and the docstring for the Python function.
         The input should be formatted as a single string, with the code and docstring combined.
+    model : str
+        The name of the OpenAI model to use for the query.
 
     Returns
     -------
@@ -110,7 +112,7 @@ def ask_for_critique(function: str) -> Dict[str, str]:
         {"role": "user", "content": function},
     ]
     response = openai.ChatCompletion.create(
-        model="gpt-4", temperature=0.1, messages=messages
+        model=model, temperature=0.0, messages=messages
     )
 
     response_str = response["choices"][0]["message"]["content"]
@@ -165,7 +167,7 @@ def report_concerns(response_dict: Dict[str, str]) -> Tuple[int, int]:
     return error_count, warning_count
 
 
-def process_file(file_path: str) -> Tuple[int, int]:
+def process_file(file_path: str, model: str) -> Tuple[int, int]:
     """
     Process a single Python file and analyze its functions' docstrings.
 
@@ -178,6 +180,8 @@ def process_file(file_path: str) -> Tuple[int, int]:
     ----------
     file_path : str
         The path to the .py file to analyze the functions' docstrings.
+    model : str
+        The name of the OpenAI model to use for the analysis.
 
     Returns
     -------
@@ -194,7 +198,7 @@ def process_file(file_path: str) -> Tuple[int, int]:
             f"Processing function {idx + 1} of {len(functions)} in file {file_path}..."
         )
         assert isinstance(function, str)
-        critique = ask_for_critique(function)
+        critique = ask_for_critique(function, model)
         errors, warnings = report_concerns(critique)
         error_count += errors
         warning_count += warnings
@@ -203,7 +207,7 @@ def process_file(file_path: str) -> Tuple[int, int]:
 
 
 def process_directory(
-    directory_path: str, ignore_dirs: Optional[List[str]] = None
+    directory_path: str, model: str, ignore_dirs: Optional[List[str]] = None
 ) -> Tuple[int, int]:
     """
     Recursively process all .py files in a directory and its subdirectories, ignoring specified directories.
@@ -212,7 +216,8 @@ def process_directory(
     ----------
     directory_path : str
         The path to the directory containing .py files to analyze the functions' docstrings.
-
+    model : str
+        The name of the OpenAI model to use for the docstring analysis.
     ignore_dirs : Optional[List[str]]
         A list of directory names to ignore while processing .py files. By default, it ignores the "tests" directory.
 
@@ -233,7 +238,7 @@ def process_directory(
         for file in files:
             if file.endswith(".py"):
                 file_path = os.path.join(root, file)
-                errors, warnings = process_file(file_path)
+                errors, warnings = process_file(file_path, model)
                 error_count += errors
                 warning_count += warnings
 
@@ -255,7 +260,13 @@ def process_directory(
     default=False,
     help="If true, warnings will be treated as errors and included in the exit code count.",
 )
-def docstring_auditor(path: str, ignore_dirs: List[str], error_on_warnings: bool):
+@click.option(
+    "--model",
+    type=click.STRING,
+    default="gpt-4",
+    help="The OpenAI model to use for docstring analysis. Default is 'gpt-4'.",
+)
+def docstring_auditor(path: str, ignore_dirs: List[str], error_on_warnings: bool, model: str):
     """
     Analyze Python functions' docstrings in a given file or directory and provide critiques and suggestions for improvement.
 
@@ -271,6 +282,8 @@ def docstring_auditor(path: str, ignore_dirs: List[str], error_on_warnings: bool
         A list of directory names to ignore while processing .py files.
     error_on_warnings : bool
         If true, warnings will be treated as errors and included in the exit code count.
+    model : str
+        The OpenAI model to use for docstring analysis. Default is 'gpt-4'.
 
     Returns
     -------
@@ -278,9 +291,9 @@ def docstring_auditor(path: str, ignore_dirs: List[str], error_on_warnings: bool
         The function does not return any value. It prints the critiques and suggestions for the docstrings in the given file or directory.
     """
     if os.path.isfile(path):
-        error_count, warning_count = process_file(path)
+        error_count, warning_count = process_file(path, model)
     elif os.path.isdir(path):
-        error_count, warning_count = process_directory(path, ignore_dirs)
+        error_count, warning_count = process_directory(path, model, ignore_dirs)
     else:
         error_text = "Invalid path. Please provide a valid file or directory path."
         click.secho(error_text, fg="red")
diff --git a/pyproject.toml b/pyproject.toml
index 1106684..0da5cf5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "docstring-auditor"
-version = "0.1.7"
+version = "0.1.8"
 authors = [{name = "Rob Luke", email = "rob.luke@ae.studio"}]
 description = "A tool to analyze Python functions' docstrings and provide critiques and suggestions for improvement"
 readme = "README.md"
diff --git a/tests/test_critique.py b/tests/test_critique.py
index 9411ff5..0cfa6da 100644
--- a/tests/test_critique.py
+++ b/tests/test_critique.py
@@ -171,7 +171,7 @@ def test_ask_for_critique(openai_mock):
         "    return 'successful'\n"
     )
 
-    response_dict = ask_for_critique(function)
+    response_dict = ask_for_critique(function, model="gpt-4")
     assert response_dict["function"].startswith("test_function_")
 
     current_test_id = (