diff --git a/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts b/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts
index e9133400dc..4808d8a4e9 100644
--- a/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts
+++ b/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts
@@ -11,6 +11,7 @@ import {
   isGPT5SeriesModel,
   isGrokReasoningModel,
   isNotSupportSystemMessageModel,
+  isOpenAIOpenWeightModel,
   isOpenAIReasoningModel,
   isQwenAlwaysThinkModel,
   isQwenMTModel,
@@ -531,12 +532,12 @@ export class OpenAIAPIClient extends OpenAIBaseClient<
         // 1. 处理系统消息
         const systemMessage = { role: 'system', content: assistant.prompt || '' }
 
-        if (isSupportedReasoningEffortOpenAIModel(model)) {
-          if (isSupportDeveloperRoleProvider(this.provider)) {
-            systemMessage.role = 'developer'
-          } else {
-            systemMessage.role = 'system'
-          }
+        if (
+          isSupportedReasoningEffortOpenAIModel(model) &&
+          isSupportDeveloperRoleProvider(this.provider) &&
+          !isOpenAIOpenWeightModel(model)
+        ) {
+          systemMessage.role = 'developer'
         }
 
         if (model.id.includes('o1-mini') || model.id.includes('o1-preview')) {
diff --git a/src/renderer/src/aiCore/clients/openai/OpenAIResponseAPIClient.ts b/src/renderer/src/aiCore/clients/openai/OpenAIResponseAPIClient.ts
index 10a2ee7bbe..36666fcaf2 100644
--- a/src/renderer/src/aiCore/clients/openai/OpenAIResponseAPIClient.ts
+++ b/src/renderer/src/aiCore/clients/openai/OpenAIResponseAPIClient.ts
@@ -5,6 +5,7 @@ import {
   isGPT5SeriesModel,
   isOpenAIChatCompletionOnlyModel,
   isOpenAILLMModel,
+  isOpenAIOpenWeightModel,
   isSupportedReasoningEffortOpenAIModel,
   isSupportVerbosityModel,
   isVisionModel
@@ -374,12 +375,12 @@ export class OpenAIResponseAPIClient extends OpenAIBaseClient<
           text: assistant.prompt || '',
           type: 'input_text'
         }
-        if (isSupportedReasoningEffortOpenAIModel(model)) {
-          if (isSupportDeveloperRoleProvider(this.provider)) {
-            systemMessage.role = 'developer'
-          } else {
-            systemMessage.role = 'system'
-          }
+        if (
+          isSupportedReasoningEffortOpenAIModel(model) &&
+          isSupportDeveloperRoleProvider(this.provider) &&
+          isOpenAIOpenWeightModel(model)
+        ) {
+          systemMessage.role = 'developer'
         }
 
         // 2. 设置工具
diff --git a/src/renderer/src/config/models.ts b/src/renderer/src/config/models.ts
index ac2a527a9c..9ee608b1b0 100644
--- a/src/renderer/src/config/models.ts
+++ b/src/renderer/src/config/models.ts
@@ -2909,7 +2909,11 @@ export function isNotSupportTemperatureAndTopP(model: Model): boolean {
     return true
   }
 
-  if (isOpenAIReasoningModel(model) || isOpenAIChatCompletionOnlyModel(model) || isQwenMTModel(model)) {
+  if (
+    (isOpenAIReasoningModel(model) && !isOpenAIOpenWeightModel(model)) ||
+    isOpenAIChatCompletionOnlyModel(model) ||
+    isQwenMTModel(model)
+  ) {
     return true
   }
 
@@ -3254,5 +3258,10 @@ export const isGPT5SeriesModel = (model: Model) => {
   return modelId.includes('gpt-5')
 }
 
+export const isOpenAIOpenWeightModel = (model: Model) => {
+  const modelId = getLowerBaseModelName(model.id)
+  return modelId.includes('gpt-oss')
+}
+
 // zhipu 视觉推理模型用这组 special token 标记推理结果
 export const ZHIPU_RESULT_TOKENS = ['<|begin_of_box|>', '<|end_of_box|>'] as const