diff --git a/OpenAI_API/EndpointBase.cs b/OpenAI_API/EndpointBase.cs
index d981c7e..e9f86d6 100644
--- a/OpenAI_API/EndpointBase.cs
+++ b/OpenAI_API/EndpointBase.cs
@@ -27,7 +27,7 @@ public abstract class EndpointBase
 		/// Constructor of the api endpoint base, to be called from the contructor of any devived classes.  Rather than instantiating any endpoint yourself, access it through an instance of <see cref="OpenAIAPI"/>.
 		/// </summary>
 		/// <param name="api"></param>
-		internal EndpointBase(OpenAIAPI api)
+		public EndpointBase(OpenAIAPI api)
 		{
 			this._Api = api;
 		}
diff --git a/OpenAI_API/Images/ImageSize.cs b/OpenAI_API/Images/ImageSize.cs
index 1b3709c..42c886a 100644
--- a/OpenAI_API/Images/ImageSize.cs
+++ b/OpenAI_API/Images/ImageSize.cs
@@ -11,7 +11,7 @@ namespace OpenAI_API.Images
 	/// </summary>
 	public class ImageSize
 	{
-		internal ImageSize(string value) { Value = value; }
+		public ImageSize(string value) { Value = value; }
 
 		private string Value { get; set; }
 
diff --git a/OpenAI_API/Model/Model.cs b/OpenAI_API/Model/Model.cs
index 787740a..bc310f6 100644
--- a/OpenAI_API/Model/Model.cs
+++ b/OpenAI_API/Model/Model.cs
@@ -140,22 +140,27 @@ public async Task<Model> RetrieveModelDetailsAsync(OpenAI_API.OpenAIAPI api)
 		/// </summary>
 		public static Model GPT4_32k_Context => new Model("gpt-4-32k") { OwnedBy = "openai" };
 
-		/// <summary>
-		/// Ability to understand images, in addition to all other GPT-4 Turbo capabilities. Returns a maximum of 4,096 output tokens. This is a preview model version and not suited yet for production traffic.
-		/// </summary>
-		public static Model GPT4_Vision => new Model("gpt-4-vision-preview") { OwnedBy = "openai" };
-
-		/// <summary>
-		///	The latest GPT-4 model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more. Returns a maximum of 4,096 output tokens. This preview model is not yet suited for production traffic. 
-		/// </summary>
-		public static Model GPT4_Turbo => new Model("gpt-4-turbo-preview") { OwnedBy = "openai" };
-		#endregion
-
-		#region GPT-3.5
-		/// <summary>
-		/// GPT-3.5 Turbo model which regularly updates with the latest model iteration.
-		/// </summary>
-		public static Model ChatGPTTurbo => new Model("gpt-3.5-turbo") { OwnedBy = "openai" };
+        /// <summary>
+        /// GPT-4 Turbo model with vision capabilities. Vision requests can now use JSON mode and function calling.
+        /// </summary>
+        public static Model GPT4_Vision => new Model("gpt-4-turbo") { OwnedBy = "openai" };
+
+        /// <summary>
+        ///	GPT-4 Turbo model with vision capabilities. Vision requests can now use JSON mode and function calling.
+        /// </summary>
+        public static Model GPT4_Turbo => new Model("gpt-4-turbo") { OwnedBy = "openai" };
+
+        /// <summary>
+        ///	Our most advanced, multimodal flagship model that’s cheaper and faster than GPT-4 Turbo.
+        /// </summary>
+        public static Model GPT4_Omni => new Model("gpt-4o") { OwnedBy = "openai" };
+        #endregion
+
+        #region GPT-3.5
+        /// <summary>
+        /// GPT-3.5 Turbo model which regularly updates with the latest model iteration.
+        /// </summary>
+        public static Model ChatGPTTurbo => new Model("gpt-3.5-turbo") { OwnedBy = "openai" };
 
 		/// <summary>
 		/// The latest GPT-3.5 Turbo model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more. Returns a maximum of 4,096 output tokens.