diff --git a/OpenAI-DotNet/Authentication/OpenAIClientSettings.cs b/OpenAI-DotNet/Authentication/OpenAIClientSettings.cs
index da1a0fcb..18c08740 100644
--- a/OpenAI-DotNet/Authentication/OpenAIClientSettings.cs
+++ b/OpenAI-DotNet/Authentication/OpenAIClientSettings.cs
@@ -28,6 +28,21 @@ public OpenAIClientSettings()
             UseOAuthAuthentication = true;
         }
 
+        /// <summary>
+        /// Creates a new instance of <see cref="OpenAIClientSettings"/> for use with OpenAI.
+        /// Must specify a full base url such as "https://api.openai.com/v1/".
+        /// </summary>
+        /// <param name="baseUrl">A custom base url.</param>
+        public OpenAIClientSettings(string baseUrl)
+        {
+            ResourceName = string.Empty;
+            ApiVersion = string.Empty;
+            DeploymentId = string.Empty;
+            BaseRequest = string.Empty;
+            BaseRequestUrlFormat = $"{baseUrl}{{0}}";
+            UseOAuthAuthentication = true;
+        }
+
         /// <summary>
         /// Creates a new instance of <see cref="OpenAIClientSettings"/> for use with OpenAI.
         /// </summary>