Merge pull request #157 from tobitege/feat_openai_gpt54_codex53

(feat)Add GPT-5.4 and GPT-5.3-Codex model support

Author: lofcz

README.md

@@ -127,7 +127,7 @@ foreach (ChatModel model in models)
 }
 ```
 
-💡 Instead of passing in a strongly typed model, you can pass a string instead: `await api.Chat.CreateConversation("gpt-4o")`, Tornado will automatically resolve the provider.
+💡 Instead of passing in a strongly typed model, you can pass a string instead: `await api.Chat.CreateConversation("gpt-5-mini")`, Tornado will automatically resolve the provider.
 
 ## ❄️ Vendor Extensions
 

src/LlmTornado.Tests/ContextController/ContextWindowSummarizerOrderTests.cs

@@ -104,10 +104,10 @@ public async Task PreservesOrder_WithChunkSplitting_MultipleSummaries()
 
         var summarizer = CreateSummarizer(store);
 
-        // Small chunk size to force splits between U1/U2/U3
+        // Small token-based chunk size to force splits between U1/U2/U3
         var options = new MessageCompressionOptions
         {
-            ChunkSize = 250, // each ~200, so each becomes its own summary
+            ChunkSize = 75, // each 200-char message is ~50 tokens, so contiguous messages split into separate summaries
             PreserveSystemmessages = true,
             CompressToolCallmessages = true,
             SummaryModel = TestModel,

src/LlmTornado/Chat/ChatRequest.cs

@@ -568,7 +568,7 @@ private static string PreparePayload(JObject sourceObject, ChatRequest context,
 						x.Temperature = null;
 					}
 
-					// GPT-5.2 parameter compatibility
+					// GPT-5.2 and GPT-5.4 parameter compatibility
 					bool hasNonNoneReasoning = x.ReasoningEffort is not null && x.ReasoningEffort != ChatReasoningEfforts.None;
 					if (ChatModelOpenAi.ShouldClearSamplingParams(x.Model, hasNonNoneReasoning))
 					{

src/LlmTornado/Chat/Models/OpenAi/ChatModelOpenAi.cs

@@ -45,9 +45,9 @@ public class ChatModelOpenAi : BaseVendorModelProvider
     public readonly ChatModelOpenAiGpt52 Gpt52 = new ChatModelOpenAiGpt52();
 
     /// <summary>
-    /// GPT-5.3 models.
+    /// GPT-5.4 models.
     /// </summary>
-    public readonly ChatModelOpenAiGpt53 Gpt53 = new ChatModelOpenAiGpt53();
+    public readonly ChatModelOpenAiGpt54 Gpt54 = new ChatModelOpenAiGpt54();
 
     /// <summary>
     /// O3 models.
@@ -98,14 +98,14 @@ public override bool OwnsModel(string model)
     /// </summary>
     public static List<IModel> ModelsAll => LazyModelsAll.Value;
 
-    private static readonly Lazy<List<IModel>> LazyModelsAll = new Lazy<List<IModel>>(() => [..ChatModelOpenAiGpt35.ModelsAll, ..ChatModelOpenAiGpt4.ModelsAll, ..ChatModelOpenAiO3.ModelsAll, ..ChatModelOpenAiO4.ModelsAll, ..ChatModelOpenAiGpt41.ModelsAll, ..ChatModelOpenAiGpt5.ModelsAll, ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ..ChatModelOpenAiGpt53.ModelsAll, ..ChatModelOpenAiCodex.ModelsAll]);
+    private static readonly Lazy<List<IModel>> LazyModelsAll = new Lazy<List<IModel>>(() => [..ChatModelOpenAiGpt35.ModelsAll, ..ChatModelOpenAiGpt4.ModelsAll, ..ChatModelOpenAiO3.ModelsAll, ..ChatModelOpenAiO4.ModelsAll, ..ChatModelOpenAiGpt41.ModelsAll, ..ChatModelOpenAiGpt5.ModelsAll, ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ..ChatModelOpenAiGpt54.ModelsAll, ..ChatModelOpenAiCodex.ModelsAll]);
 
     /// <summary>
     /// All reasoning models. Requests for these models are serialized differently.
     /// </summary>
     public static List<IModel> ReasoningModelsAll => LazyReasoningModelsAll.Value;
 
-    private static readonly Lazy<List<IModel>> LazyReasoningModelsAll = new Lazy<List<IModel>>(() => [..ChatModelOpenAiGpt4.ReasoningModels, ..ChatModelOpenAiO3.ModelsAll, ..ChatModelOpenAiO4.ModelsAll, ..ChatModelOpenAiGpt5.ModelsAll, ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ..ChatModelOpenAiGpt53.ModelsAll]);
+    private static readonly Lazy<List<IModel>> LazyReasoningModelsAll = new Lazy<List<IModel>>(() => [..ChatModelOpenAiGpt4.ReasoningModels, ..ChatModelOpenAiO3.ModelsAll, ..ChatModelOpenAiO4.ModelsAll, ..ChatModelOpenAiGpt5.ModelsAll, ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ..ChatModelOpenAiGpt54.ModelsAll, ChatModelOpenAiCodex.ModelGpt53Codex]);
 
     /// <summary>
     /// HashSet version of ReasoningModelsAll.
@@ -119,7 +119,7 @@ public override bool OwnsModel(string model)
     /// </summary>
     public static List<IModel> WebSearchCompatibleModelsAll => LazyWebSearchCompatibleModelsAll.Value;
 
-    private static readonly Lazy<List<IModel>> LazyWebSearchCompatibleModelsAll = new Lazy<List<IModel>>(() => [ChatModelOpenAiGpt4.ModelOSearchPreview, ChatModelOpenAiGpt4.ModelOMiniSearchPreview, ..ChatModelOpenAiGpt5.ModelsAll, ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ..ChatModelOpenAiGpt53.ModelsAll]);
+    private static readonly Lazy<List<IModel>> LazyWebSearchCompatibleModelsAll = new Lazy<List<IModel>>(() => [ChatModelOpenAiGpt4.ModelOSearchPreview, ChatModelOpenAiGpt4.ModelOMiniSearchPreview, ..ChatModelOpenAiGpt5.ModelsAll, ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ..ChatModelOpenAiGpt54.ModelsAll]);
 
     internal static HashSet<IModel> TempIncompatibleModels => LazyTempIncompatibleModels.Value;
 
@@ -133,22 +133,24 @@ public override bool OwnsModel(string model)
     internal static HashSet<IModel> SamplingParamsNeverSupported => LazySamplingParamsNeverSupported.Value;
 
     private static readonly Lazy<HashSet<IModel>> LazySamplingParamsNeverSupported = new Lazy<HashSet<IModel>>(() => [
-        ChatModelOpenAiGpt5.ModelV5, ChatModelOpenAiGpt5.ModelV5Mini, ChatModelOpenAiGpt5.ModelV5Nano, ChatModelOpenAiGpt5.ModelV5Pro, ChatModelOpenAiGpt5.ModelV5Codex
+        ChatModelOpenAiGpt5.ModelV5, ChatModelOpenAiGpt5.ModelV5Mini, ChatModelOpenAiGpt5.ModelV5Nano, ChatModelOpenAiGpt5.ModelV5Pro, ChatModelOpenAiGpt5.ModelV5Codex, ChatModelOpenAiGpt54.ModelV54Pro, ChatModelOpenAiCodex.ModelGpt53Codex
     ]);
 
     /// <summary>
-    /// Models that conditionally support temperature/top_p/logprobs only when reasoning effort is none (GPT-5.2, GPT-5.1).
+    /// Models that conditionally support temperature/top_p/logprobs only when reasoning effort is none (GPT-5.4, GPT-5.2, GPT-5.1).
     /// </summary>
     internal static HashSet<IModel> SamplingParamsConditionallySupported => LazySamplingParamsConditionallySupported.Value;
 
     private static readonly Lazy<HashSet<IModel>> LazySamplingParamsConditionallySupported = new Lazy<HashSet<IModel>>(() => [
-        ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ..ChatModelOpenAiGpt53.ModelsAll
+        ..ChatModelOpenAiGpt51.ModelsAll, ..ChatModelOpenAiGpt52.ModelsAll, ChatModelOpenAiGpt54.ModelV54
     ]);
 
     /// <summary>
     /// Determines whether sampling parameters (temperature, top_p, logprobs) should be cleared for GPT-5.x models.
-    /// GPT-5.2 parameter compatibility:
+    /// GPT-5.4 parameter compatibility:
     /// - Older GPT-5 models (gpt-5, gpt-5-mini, gpt-5-nano) never support these parameters
+    /// - GPT-5.4 only supports these on gpt-5.4 when reasoning effort is none, while gpt-5.4-pro never supports them
+    /// - GPT-5.3-Codex never supports these because it only exposes reasoning modes low, medium, high, and xhigh
     /// - GPT-5.2 and GPT-5.1 only support these when reasoning effort is none
     /// </summary>
     /// <param name="model">The model being used.</param>

src/LlmTornado/Chat/Models/OpenAi/ChatModelOpenAiCodex.cs

@@ -37,12 +37,27 @@ public class ChatModelOpenAiCodex : IVendorModelClassProvider
     /// </summary>
     public readonly ChatModel MiniLatest = ModelMiniLatest;
 
+    /// <summary>
+    /// GPT-5.3-Codex is OpenAI's most capable agentic coding model to date.
+    /// Supports low, medium, high, and xhigh reasoning effort settings.
+    /// 400,000 context window, 128,000 max output tokens, Aug 31, 2025 knowledge cutoff.
+    /// </summary>
+    public static readonly ChatModel ModelGpt53Codex = new ChatModel("gpt-5.3-codex", LLmProviders.OpenAi, 400_000)
+    {
+        EndpointCapabilities = [ ChatModelEndpointCapabilities.Responses, ChatModelEndpointCapabilities.Chat, ChatModelEndpointCapabilities.Batch ]
+    };
+
+    /// <summary>
+    /// <inheritdoc cref="ModelGpt53Codex"/>
+    /// </summary>
+    public readonly ChatModel Gpt53Codex = ModelGpt53Codex;
+
     /// <summary>
     /// All known Codex models from OpenAI.
     /// </summary>
     public static List<IModel> ModelsAll => LazyModelsAll.Value;
 
-    private static readonly Lazy<List<IModel>> LazyModelsAll = new Lazy<List<IModel>>(() => [ModelMiniLatest, ModelComputerUsePreview]);
+    private static readonly Lazy<List<IModel>> LazyModelsAll = new Lazy<List<IModel>>(() => [ModelMiniLatest, ModelComputerUsePreview, ModelGpt53Codex]);
 
     /// <summary>
     /// <inheritdoc cref="ModelsAll"/>

src/LlmTornado/Chat/Models/OpenAi/ChatModelOpenAiGpt53.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using LlmTornado.Code;
+using LlmTornado.Code.Models;
+
+namespace LlmTornado.Chat.Models;
+
+/// <summary>
+/// GPT-5.4 class models from OpenAI.
+/// </summary>
+public class ChatModelOpenAiGpt54 : IVendorModelClassProvider
+{
+    /// <summary>
+    /// GPT-5.4 is OpenAI's frontier model for complex professional work.
+    /// Supports reasoning.effort: none (default), low, medium, high, and xhigh.
+    /// 1.05M context window.
+    /// </summary>
+    public static readonly ChatModel ModelV54 = new ChatModel("gpt-5.4", LLmProviders.OpenAi, 1_050_000, [])
+    {
+        EndpointCapabilities = [ ChatModelEndpointCapabilities.Responses, ChatModelEndpointCapabilities.Chat, ChatModelEndpointCapabilities.Batch ]
+    };
+
+    /// <summary>
+    /// <inheritdoc cref="ModelV54"/>
+    /// </summary>
+    public readonly ChatModel V54 = ModelV54;
+
+    /// <summary>
+    /// GPT-5.4 Pro uses more compute to think harder and provide consistently better answers.
+    /// Available in the Responses API only and supports reasoning.effort: medium, high, and xhigh.
+    /// 1.05M context window.
+    /// </summary>
+    public static readonly ChatModel ModelV54Pro = new ChatModel("gpt-5.4-pro", LLmProviders.OpenAi, 1_050_000, [])
+    {
+        EndpointCapabilities = [ ChatModelEndpointCapabilities.Responses, ChatModelEndpointCapabilities.Batch ]
+    };
+
+    /// <summary>
+    /// <inheritdoc cref="ModelV54Pro"/>
+    /// </summary>
+    public readonly ChatModel V54Pro = ModelV54Pro;
+
+    /// <summary>
+    /// All known GPT-5.4 models from OpenAI.
+    /// </summary>
+    public static List<IModel> ModelsAll => LazyModelsAll.Value;
+
+    private static readonly Lazy<List<IModel>> LazyModelsAll = new Lazy<List<IModel>>(() => [
+        ModelV54, ModelV54Pro
+    ]);
+    
+    /// <summary>
+    /// <inheritdoc cref="ModelsAll"/>
+    /// </summary>
+    public List<IModel> AllModels => ModelsAll;
+    
+    internal ChatModelOpenAiGpt54()
+    {
+        
+    }
+}