diff --git a/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Chat/ChatCompletionProvider.Response.cs b/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Chat/ChatCompletionProvider.Response.cs
index 13190103f..4136185c0 100644
--- a/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Chat/ChatCompletionProvider.Response.cs
+++ b/src/Plugins/BotSharp.Plugin.OpenAI/Providers/Chat/ChatCompletionProvider.Response.cs
@@ -438,14 +438,12 @@ private async Task<RoleDialogModel> InnerCreateResponseStreamingAsync(Agent agen
         var allowMultiModal = settings != null && settings.MultiModal;
         renderedInstructions = [];
 
-        float? temperature = float.Parse(_state.GetState("temperature", "0.0"));
         var maxTokens = int.TryParse(_state.GetState("max_tokens"), out var tokens)
                         ? tokens
                         : agent.LlmConfig?.MaxOutputTokens ?? LlmConstant.DEFAULT_MAX_OUTPUT_TOKEN;
 
         var options = new CreateResponseOptions(_model, [])
         {
-            Temperature = temperature,
             MaxOutputTokenCount = maxTokens,
         };
 
@@ -458,11 +456,6 @@ private async Task<RoleDialogModel> InnerCreateResponseStreamingAsync(Agent agen
                 ReasoningEffortLevel = reasoningEffortLevel.Value,
                 ReasoningSummaryVerbosity = ResponseReasoningSummaryVerbosity.Auto
             };
-
-            if (reasoningEffortLevel != ResponseReasoningEffortLevel.None)
-            {
-                options.Temperature = null;
-            }
         }
 
         // Response format