Add ChatOptions.Seed

src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatOptions.cs

@@ -27,6 +27,9 @@ public class ChatOptions
     /// <summary>Gets or sets the presence penalty for generating chat responses.</summary>
     public float? PresencePenalty { get; set; }
 
+    /// <summary>Gets or sets a seed value used by a service to control the reproducability of results.</summary>
+    public long? Seed { get; set; }
+
     /// <summary>
     /// Gets or sets the response format for the chat request.
     /// </summary>
@@ -74,6 +77,7 @@ public virtual ChatOptions Clone()
             TopK = TopK,
             FrequencyPenalty = FrequencyPenalty,
             PresencePenalty = PresencePenalty,
+            Seed = Seed,
             ResponseFormat = ResponseFormat,
             ModelId = ModelId,
             ToolMode = ToolMode,

src/Libraries/Microsoft.Extensions.AI.AzureAIInference/AzureAIInferenceChatClient.cs

@@ -285,6 +285,7 @@ private ChatCompletionsOptions ToAzureAIOptions(IList<ChatMessage> chatContents,
             result.NucleusSamplingFactor = options.TopP;
             result.PresencePenalty = options.PresencePenalty;
             result.Temperature = options.Temperature;
+            result.Seed = options.Seed;
 
             if (options.StopSequences is { Count: > 0 } stopSequences)
             {
@@ -306,11 +307,6 @@ private ChatCompletionsOptions ToAzureAIOptions(IList<ChatMessage> chatContents,
                 {
                     switch (prop.Key)
                     {
-                        // These properties are strongly-typed on the ChatCompletionsOptions class but not on the ChatOptions class.
-                        case nameof(result.Seed) when prop.Value is long seed:
-                            result.Seed = seed;
-                            break;
-
                         // Propagate everything else to the ChatCompletionOptions' AdditionalProperties.
                         default:
                             if (prop.Value is not null)

src/Libraries/Microsoft.Extensions.AI.Ollama/OllamaChatClient.cs

@@ -273,7 +273,6 @@ private OllamaChatRequest ToOllamaChatRequest(IList<ChatMessage> chatMessages, C
             TransferMetadataValue<bool>(nameof(OllamaRequestOptions.penalize_newline), (options, value) => options.penalize_newline = value);
             TransferMetadataValue<int>(nameof(OllamaRequestOptions.repeat_last_n), (options, value) => options.repeat_last_n = value);
             TransferMetadataValue<float>(nameof(OllamaRequestOptions.repeat_penalty), (options, value) => options.repeat_penalty = value);
-            TransferMetadataValue<long>(nameof(OllamaRequestOptions.seed), (options, value) => options.seed = value);
             TransferMetadataValue<float>(nameof(OllamaRequestOptions.tfs_z), (options, value) => options.tfs_z = value);
             TransferMetadataValue<float>(nameof(OllamaRequestOptions.typical_p), (options, value) => options.typical_p = value);
             TransferMetadataValue<bool>(nameof(OllamaRequestOptions.use_mmap), (options, value) => options.use_mmap = value);
@@ -314,6 +313,11 @@ private OllamaChatRequest ToOllamaChatRequest(IList<ChatMessage> chatMessages, C
             {
                 (request.Options ??= new()).top_k = topK;
             }
+
+            if (options.Seed is long seed)
+            {
+                (request.Options ??= new()).seed = seed;
+            }
         }
 
         return request;

src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIChatClient.cs

@@ -392,6 +392,9 @@ private static ChatCompletionOptions ToOpenAIOptions(ChatOptions? options)
             result.TopP = options.TopP;
             result.PresencePenalty = options.PresencePenalty;
             result.Temperature = options.Temperature;
+#pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates.
+            result.Seed = options.Seed;
+#pragma warning restore OPENAI001
 
             if (options.StopSequences is { Count: > 0 } stopSequences)
             {
@@ -426,13 +429,6 @@ private static ChatCompletionOptions ToOpenAIOptions(ChatOptions? options)
                     result.AllowParallelToolCalls = allowParallelToolCalls;
                 }
 
-#pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-                if (additionalProperties.TryGetValue(nameof(result.Seed), out long seed))
-                {
-                    result.Seed = seed;
-                }
-#pragma warning restore OPENAI001
-
                 if (additionalProperties.TryGetValue(nameof(result.TopLogProbabilityCount), out int topLogProbabilityCountInt))
                 {
                     result.TopLogProbabilityCount = topLogProbabilityCountInt;

src/Libraries/Microsoft.Extensions.AI/ChatCompletion/OpenTelemetryChatClient.cs

@@ -322,7 +322,7 @@ private static ChatCompletion ComposeStreamingUpdatesIntoChatCompletion(
                             _ = activity.AddTag(OpenTelemetryConsts.GenAI.Request.PerProvider(_system, "response_format"), responseFormat);
                         }
 
-                        if (options.AdditionalProperties?.TryGetValue("seed", out long seed) is true)
+                        if (options.Seed is long seed)
                         {
                             _ = activity.AddTag(OpenTelemetryConsts.GenAI.Request.PerProvider(_system, "seed"), seed);
                         }

test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/ChatCompletion/ChatOptionsTests.cs

@@ -19,6 +19,7 @@ public void Constructor_Parameterless_PropsDefaulted()
         Assert.Null(options.TopK);
         Assert.Null(options.FrequencyPenalty);
         Assert.Null(options.PresencePenalty);
+        Assert.Null(options.Seed);
         Assert.Null(options.ResponseFormat);
         Assert.Null(options.ModelId);
         Assert.Null(options.StopSequences);
@@ -33,6 +34,7 @@ public void Constructor_Parameterless_PropsDefaulted()
         Assert.Null(clone.TopK);
         Assert.Null(clone.FrequencyPenalty);
         Assert.Null(clone.PresencePenalty);
+        Assert.Null(options.Seed);
         Assert.Null(clone.ResponseFormat);
         Assert.Null(clone.ModelId);
         Assert.Null(clone.StopSequences);
@@ -69,6 +71,7 @@ public void Properties_Roundtrip()
         options.TopK = 42;
         options.FrequencyPenalty = 0.4f;
         options.PresencePenalty = 0.5f;
+        options.Seed = 12345;
         options.ResponseFormat = ChatResponseFormat.Json;
         options.ModelId = "modelId";
         options.StopSequences = stopSequences;
@@ -82,6 +85,7 @@ public void Properties_Roundtrip()
         Assert.Equal(42, options.TopK);
         Assert.Equal(0.4f, options.FrequencyPenalty);
         Assert.Equal(0.5f, options.PresencePenalty);
+        Assert.Equal(12345, options.Seed);
         Assert.Same(ChatResponseFormat.Json, options.ResponseFormat);
         Assert.Equal("modelId", options.ModelId);
         Assert.Same(stopSequences, options.StopSequences);
@@ -96,6 +100,7 @@ public void Properties_Roundtrip()
         Assert.Equal(42, clone.TopK);
         Assert.Equal(0.4f, clone.FrequencyPenalty);
         Assert.Equal(0.5f, clone.PresencePenalty);
+        Assert.Equal(12345, options.Seed);
         Assert.Same(ChatResponseFormat.Json, clone.ResponseFormat);
         Assert.Equal("modelId", clone.ModelId);
         Assert.Equal(stopSequences, clone.StopSequences);
@@ -126,6 +131,7 @@ public void JsonSerialization_Roundtrips()
         options.TopK = 42;
         options.FrequencyPenalty = 0.4f;
         options.PresencePenalty = 0.5f;
+        options.Seed = 12345;
         options.ResponseFormat = ChatResponseFormat.Json;
         options.ModelId = "modelId";
         options.StopSequences = stopSequences;
@@ -148,6 +154,7 @@ public void JsonSerialization_Roundtrips()
         Assert.Equal(42, deserialized.TopK);
         Assert.Equal(0.4f, deserialized.FrequencyPenalty);
         Assert.Equal(0.5f, deserialized.PresencePenalty);
+        Assert.Equal(12345, deserialized.Seed);
         Assert.Equal(ChatResponseFormat.Json, deserialized.ResponseFormat);
         Assert.NotSame(ChatResponseFormat.Json, deserialized.ResponseFormat);
         Assert.Equal("modelId", deserialized.ModelId);

test/Libraries/Microsoft.Extensions.AI.AzureAIInference.Tests/AzureAIInferenceChatClientTests.cs

@@ -247,8 +247,8 @@ public async Task MultipleMessages_NonStreaming()
                 ],
                 "presence_penalty": 0.5,
                 "frequency_penalty": 0.75,
-                "model": "gpt-4o-mini",
-                "seed": 42
+                "seed": 42,
+                "model": "gpt-4o-mini"
             }
             """;
 
@@ -303,7 +303,7 @@ public async Task MultipleMessages_NonStreaming()
             FrequencyPenalty = 0.75f,
             PresencePenalty = 0.5f,
             StopSequences = ["great"],
-            AdditionalProperties = new() { ["seed"] = 42L },
+            Seed = 42,
         });
         Assert.NotNull(response);
 

test/Libraries/Microsoft.Extensions.AI.Ollama.Tests/OllamaChatClientIntegrationTests.cs

@@ -49,7 +49,7 @@ public async Task PromptBasedFunctionCalling_NoArgs()
             ModelId = "llama3:8b",
             Tools = [AIFunctionFactory.Create(() => secretNumber, "GetSecretNumber")],
             Temperature = 0,
-            AdditionalProperties = new() { ["seed"] = 0L },
+            Seed = 0,
         });
 
         Assert.Single(response.Choices);
@@ -83,7 +83,7 @@ public async Task PromptBasedFunctionCalling_WithArgs()
         {
             Tools = [stockPriceTool, irrelevantTool],
             Temperature = 0,
-            AdditionalProperties = new() { ["seed"] = 0L },
+            Seed = 0,
         });
 
         Assert.Single(response.Choices);

test/Libraries/Microsoft.Extensions.AI.Ollama.Tests/OllamaChatClientTests.cs

@@ -254,7 +254,7 @@ public async Task MultipleMessages_NonStreaming()
             FrequencyPenalty = 0.75f,
             PresencePenalty = 0.5f,
             StopSequences = ["great"],
-            AdditionalProperties = new() { ["seed"] = 42 },
+            Seed = 42,
         });
         Assert.NotNull(response);
 

test/Libraries/Microsoft.Extensions.AI.OpenAI.Tests/OpenAIChatClientTests.cs

@@ -348,7 +348,7 @@ public async Task MultipleMessages_NonStreaming()
             FrequencyPenalty = 0.75f,
             PresencePenalty = 0.5f,
             StopSequences = ["great"],
-            AdditionalProperties = new() { ["seed"] = 42 },
+            Seed = 42,
         });
         Assert.NotNull(response);