google: gemini-3.1-flash-image-preview

Author: lofcz

src/LlmTornado/Chat/Models/Google/ChatModelGoogle.cs

@@ -96,7 +96,8 @@ public override bool OwnsModel(string model)
         ChatModelGoogleGeminiPreview.ModelGemini3ProImagePreview,
         ChatModelGoogleGeminiPreview.ModelGemini3FlashPreview,
         ChatModelGoogleGeminiPreview.ModelGemini31ProPreview,
-        ChatModelGoogleGeminiPreview.ModelGemini31ProPreviewCustomtools
+        ChatModelGoogleGeminiPreview.ModelGemini31ProPreviewCustomtools,
+        ChatModelGoogleGeminiPreview.ModelGemini31FlashImagePreview
     ];
 
     /// <summary>
@@ -113,7 +114,8 @@ public override bool OwnsModel(string model)
     /// </summary>
     public static readonly HashSet<IModel> Gemini31Models = [
         ChatModelGoogleGeminiPreview.ModelGemini31ProPreview,
-        ChatModelGoogleGeminiPreview.ModelGemini31ProPreviewCustomtools
+        ChatModelGoogleGeminiPreview.ModelGemini31ProPreviewCustomtools,
+        ChatModelGoogleGeminiPreview.ModelGemini31FlashImagePreview
     ];
 
     /// <summary>
@@ -143,7 +145,7 @@ public override bool OwnsModel(string model)
     /// </summary>
     public static List<IModel> ImageModalitySupportingModelsList => LazyImageModalitySupportingModels.Value;
 
-    private static readonly Lazy<List<IModel>> LazyImageModalitySupportingModels = new Lazy<List<IModel>>(() => [ChatModelGoogleGeminiExperimental.ModelGemini2FlashImageGeneration, ChatModelGoogleGeminiPreview.ModelGemini2FlashPreviewImageGeneration, ChatModelGoogleGeminiPreview.ModelGemini25FlashImagePreview, ChatModelGoogleGeminiPreview.ModelGemini3ProImagePreview]);
+    private static readonly Lazy<List<IModel>> LazyImageModalitySupportingModels = new Lazy<List<IModel>>(() => [ChatModelGoogleGeminiExperimental.ModelGemini2FlashImageGeneration, ChatModelGoogleGeminiPreview.ModelGemini2FlashPreviewImageGeneration, ChatModelGoogleGeminiPreview.ModelGemini25FlashImagePreview, ChatModelGoogleGeminiPreview.ModelGemini3ProImagePreview, ChatModelGoogleGeminiPreview.ModelGemini31FlashImagePreview]);
 
     /// <summary>
     /// Models listed don't support system prompt.

src/LlmTornado/Chat/Models/Google/ChatModelGoogleGeminiPreview.cs

@@ -67,6 +67,18 @@ public class ChatModelGoogleGeminiPreview : IVendorModelClassProvider
     /// </summary>
     public readonly ChatModel Gemini3ProImagePreview = ModelGemini3ProImagePreview;
 
+    /// <summary>
+    /// Gemini 3.1 Flash Image Preview delivers high-quality, photorealistic imagery at Flash speed.
+    /// Features subject consistency (up to 5 characters), object fidelity (up to 14 objects),
+    /// precise instruction following, and production-ready output from 512px to 4K.
+    /// </summary>
+    public static readonly ChatModel ModelGemini31FlashImagePreview = new ChatModel("gemini-3.1-flash-image-preview", LLmProviders.Google, 1_048_576);
+    
+    /// <summary>
+    /// <inheritdoc cref="ModelGemini31FlashImagePreview"/>
+    /// </summary>
+    public readonly ChatModel Gemini31FlashImagePreview = ModelGemini31FlashImagePreview;
+    
     /// <summary>
     /// Gemini 2.5 Computer Use Preview model enables building browser control agents that interact with and automate tasks using screenshots and UI actions like mouse clicks and keyboard inputs.
     /// </summary>
@@ -220,7 +232,7 @@ public class ChatModelGoogleGeminiPreview : IVendorModelClassProvider
     public static List<IModel> ModelsAll => LazyModelsAll.Value;
 
     private static readonly Lazy<List<IModel>> LazyModelsAll = new Lazy<List<IModel>>(() => [
-        ModelGemini3FlashPreview, ModelGemini3ProPreview, ModelGemini3ProImagePreview,
+        ModelGemini3FlashPreview, ModelGemini3ProPreview, ModelGemini3ProImagePreview, ModelGemini31FlashImagePreview,
         ModelGemini31ProPreview, ModelGemini31ProPreviewCustomtools,
         ModelGemini25ComputerUsePreview102025, ModelGemini25ProPreview0325, ModelGemini25ProPreview0506, ModelGemini25ProPreview0605, ModelGemini25FlashPreview0417,
         ModelGemini25FlashPreview0520, ModelGemini2FlashPreviewImageGeneration, ModelGemini25FlashPreviewTts, ModelGemini25ProPreviewTts,

src/LlmTornado/Chat/Vendors/Google/VendorGoogleChatRequest.cs

@@ -81,6 +81,12 @@ internal class VendorGoogleChatRequestGenerationConfig
     [JsonProperty("topK")]
     public int? TopK { get; set; }
 
+    /// <summary>
+    /// Optional. Seed used in decoding. If not set, the request uses a randomly generated seed.
+    /// </summary>
+    [JsonProperty("seed")]
+    public int? Seed { get; set; }
+    
     /// <summary>
     /// Optional. Presence penalty applied to the next token's logprobs if the token has already been seen in the response. This penalty is binary on/off and not dependant on the number of times the token is used (after the first). Use frequencyPenalty for a penalty that increases with each use. A positive penalty will discourage the use of tokens that have already been used in the response, increasing the vocabulary.
     /// </summary>
@@ -1449,7 +1455,10 @@ public VendorGoogleChatRequest(ChatRequest request, IEndpointProvider provider)
             MaxOutputTokens = request.MaxTokens,
             StopSequences = request.MultipleStopSequences is not null ? request.MultipleStopSequences.Take(5).ToList() : request.StopSequence is not null ? [ request.StopSequence ] : null,
             ResponseLogprobs = request.Logprobs,
-            Logprobs = request.TopLogprobs
+            Logprobs = request.TopLogprobs,
+            Seed = request.Seed,
+            PresencePenalty = request.PresencePenalty,
+            FrequencyPenalty = request.FrequencyPenalty
         };
 
         // thinkingConfig is not supported for non-thinking models
@@ -1542,6 +1551,7 @@ public VendorGoogleChatRequest(ChatRequest request, IEndpointProvider provider)
                     {
                         GenerationConfig.ImageConfig.ImageSize = request.ImageOutput.Resolution switch
                         {
+                            ChatImageResolutions.Resolution512 => "512",
                             ChatImageResolutions.Resolution1K => "1K",
                             ChatImageResolutions.Resolution2K => "2K",
                             ChatImageResolutions.Resolution4K => "4K",

src/LlmTornado/Code/PartialModels.cs

@@ -336,11 +336,18 @@ internal class ChatMessageFinishReasonsConverter : JsonConverter<ChatMessageFini
         { "spii", ChatMessageFinishReasons.SensitivePersonalInformation },
         { "malformed_function_call", ChatMessageFinishReasons.MalformedToolCall },
         { "image_safety", ChatMessageFinishReasons.ImageSafety },
+        { "image_prohibited_content", ChatMessageFinishReasons.ImageProhibitedContent },
+        { "image_other", ChatMessageFinishReasons.ImageOther },
+        { "no_image", ChatMessageFinishReasons.NoImage },
+        { "image_recitation", ChatMessageFinishReasons.ImageRecitation },
         { "error", ChatMessageFinishReasons.Error },
+        { "other", ChatMessageFinishReasons.Error },
 
         { "tool_use", ChatMessageFinishReasons.ToolCalls },
         { "tool_calls", ChatMessageFinishReasons.ToolCalls },
         { "function_call", ChatMessageFinishReasons.ToolCalls },
+        { "unexpected_tool_call", ChatMessageFinishReasons.UnexpectedToolCall },
+        { "too_many_tool_calls", ChatMessageFinishReasons.TooManyToolCalls },
 
         { "model_context_window_exceeded", ChatMessageFinishReasons.ContextWindowExceeded },
 
@@ -445,6 +452,36 @@ public enum ChatMessageFinishReasons
     /// </summary>
     ImageSafety,
 
+    /// <summary>
+    /// Image generation stopped because generated images contain prohibited content.
+    /// </summary>
+    ImageProhibitedContent,
+    
+    /// <summary>
+    /// Image generation stopped due to a miscellaneous issue.
+    /// </summary>
+    ImageOther,
+    
+    /// <summary>
+    /// The model was expected to generate an image but none was produced.
+    /// </summary>
+    NoImage,
+    
+    /// <summary>
+    /// Image generation stopped due to recitation.
+    /// </summary>
+    ImageRecitation,
+    
+    /// <summary>
+    /// The model generated a tool call but no tools were enabled in the request.
+    /// </summary>
+    UnexpectedToolCall,
+    
+    /// <summary>
+    /// The model called too many tools consecutively, causing the system to exit execution.
+    /// </summary>
+    TooManyToolCalls,
+    
     /// <summary>
     /// The request was canceled/aborted.
     /// </summary>
@@ -1237,6 +1274,11 @@ public enum ChatImageAspectRatios
 [JsonConverter(typeof(StringEnumConverter))]
 public enum ChatImageResolutions
 {
+    /// <summary>
+    ///     512px resolution (smallest, lowest cost per image).
+    /// </summary>
+    [EnumMember(Value = "512")]
+    Resolution512,
     /// <summary>
     ///     1K resolution (default for most models).
     /// </summary>