diff --git a/src/utils.py b/src/utils.py
new file mode 100644
index 0000000..8248142
--- /dev/null
+++ b/src/utils.py
@@ -0,0 +1,45 @@
+"""
+This module provides a function to check the validity of an OpenAI API key by making a test request
+to a chosen model using the OpenAI client. It captures various exceptions and prints error details.
+"""
+
+import rich
+from openai import APIStatusError, AuthenticationError, OpenAI, RateLimitError
+
+
+def check_key(key, model="gpt-4o-mini") -> str | None:
+    """
+    Check if the API key is valid.
+    """
+    try:
+        client = OpenAI(api_key=key)
+
+        completion = client.chat.completions.create(
+            model=model,
+            messages=[
+                {
+                    "role": "system",
+                    "content": "You are a yeser, you only output lowercase yes.",
+                },
+                {"role": "user", "content": "yes or no? say yes"},
+            ],
+        )
+        result = completion.choices[0].message.content
+        rich.print(f"🔑 [bold green]available key[/bold green]: [orange_red1]'{key}'[/orange_red1] ({result})\n")
+        return "yes"
+    except AuthenticationError as e:
+        rich.print(f"[deep_sky_blue1]{e.body['code']} ({e.status_code})[/deep_sky_blue1]: '{key[:10]}...{key[-10:]}'")  # type: ignore
+        return e.body["code"]  # type: ignore
+    except RateLimitError as e:
+        rich.print(f"[deep_sky_blue1]{e.body['code']} ({e.status_code})[/deep_sky_blue1]: '{key[:10]}...{key[-10:]}'")  # type: ignore
+        return e.body["code"]  # type: ignore
+    except APIStatusError as e:
+        rich.print(f"[bold red]{e.body['code']} ({e.status_code})[/bold red]: '{key[:10]}...{key[-10:]}'")  # type: ignore
+        return e.body["code"]  # type: ignore
+    except Exception as e:  # pylint: disable=broad-except
+        rich.print(f"[bold red]{e}[/bold red]: '{key[:10]}...{key[-10:]}'")  # type: ignore
+        return "Unknown Error"
+
+
+if __name__ == "__main__":
+    check_key("sk-proj-12345")