diff --git a/src/modules/AdvancedPaste/AdvancedPaste/Services/CustomActions/SemanticKernelPasteProvider.cs b/src/modules/AdvancedPaste/AdvancedPaste/Services/CustomActions/SemanticKernelPasteProvider.cs
index 90c8d58b1b..710aa07e66 100644
--- a/src/modules/AdvancedPaste/AdvancedPaste/Services/CustomActions/SemanticKernelPasteProvider.cs
+++ b/src/modules/AdvancedPaste/AdvancedPaste/Services/CustomActions/SemanticKernelPasteProvider.cs
@@ -172,10 +172,12 @@ namespace AdvancedPaste.Services.CustomActions
         {
             return _serviceType switch
             {
+                // Do not set model-specific tuning properties such as ReasoningEffort here: models
+                // accept different value sets (or reject the parameter outright) and any hardcoded
+                // value makes every request fail with HTTP 400 on models that don't support it.
                 AIServiceType.OpenAI or AIServiceType.AzureOpenAI => new OpenAIPromptExecutionSettings
                 {
                     FunctionChoiceBehavior = null,
-                    ReasoningEffort = "minimal",
                 },
                 _ => new PromptExecutionSettings(),
             };