diff --git a/src/renderer/src/aiCore/legacy/clients/BaseApiClient.ts b/src/renderer/src/aiCore/legacy/clients/BaseApiClient.ts
index e755ce3f2..92f24b4ab 100644
--- a/src/renderer/src/aiCore/legacy/clients/BaseApiClient.ts
+++ b/src/renderer/src/aiCore/legacy/clients/BaseApiClient.ts
@@ -9,6 +9,7 @@ import {
 import { REFERENCE_PROMPT } from '@renderer/config/prompts'
 import { getLMStudioKeepAliveTime } from '@renderer/hooks/useLMStudio'
 import { getAssistantSettings } from '@renderer/services/AssistantService'
+import type { RootState } from '@renderer/store'
 import type {
   Assistant,
   GenerateImageParams,
@@ -245,23 +246,20 @@ export abstract class BaseApiClient<
 
   protected getVerbosity(model?: Model): OpenAIVerbosity {
     try {
-      const state = window.store?.getState()
+      const state = window.store?.getState() as RootState
       const verbosity = state?.settings?.openAI?.verbosity
 
-      if (verbosity && ['low', 'medium', 'high'].includes(verbosity)) {
-        // If model is provided, check if the verbosity is supported by the model
-        if (model) {
-          const supportedVerbosity = getModelSupportedVerbosity(model)
-          // Use user's verbosity if supported, otherwise use the first supported option
-          return supportedVerbosity.includes(verbosity) ? verbosity : supportedVerbosity[0]
-        }
-        return verbosity
+      // If model is provided, check if the verbosity is supported by the model
+      if (model) {
+        const supportedVerbosity = getModelSupportedVerbosity(model)
+        // Use user's verbosity if supported, otherwise use the first supported option
+        return supportedVerbosity.includes(verbosity) ? verbosity : supportedVerbosity[0]
       }
+      return verbosity
     } catch (error) {
-      logger.warn('Failed to get verbosity from state:', error as Error)
+      logger.warn('Failed to get verbosity from state. Fallback to undefined.', error as Error)
+      return undefined
     }
-
-    return 'medium'
   }
 
   protected getTimeout(model: Model) {
diff --git a/src/renderer/src/aiCore/legacy/clients/openai/OpenAIApiClient.ts b/src/renderer/src/aiCore/legacy/clients/openai/OpenAIApiClient.ts
index ea50680ea..f6f92253c 100644
--- a/src/renderer/src/aiCore/legacy/clients/openai/OpenAIApiClient.ts
+++ b/src/renderer/src/aiCore/legacy/clients/openai/OpenAIApiClient.ts
@@ -32,7 +32,6 @@ import {
   isSupportedThinkingTokenModel,
   isSupportedThinkingTokenQwenModel,
   isSupportedThinkingTokenZhipuModel,
-  isSupportVerbosityModel,
   isVisionModel,
   MODEL_SUPPORTED_REASONING_EFFORT,
   ZHIPU_RESULT_TOKENS
@@ -714,13 +713,8 @@ export class OpenAIAPIClient extends OpenAIBaseClient<
           ...modalities,
           // groq 有不同的 service tier 配置，不符合 openai 接口类型
           service_tier: this.getServiceTier(model) as OpenAIServiceTier,
-          ...(isSupportVerbosityModel(model)
-            ? {
-                text: {
-                  verbosity: this.getVerbosity(model)
-                }
-              }
-            : {}),
+          // verbosity. getVerbosity ensure the returned value is valid.
+          verbosity: this.getVerbosity(model),
           ...this.getProviderSpecificParameters(assistant, model),
           ...reasoningEffort,
           // ...getOpenAIWebSearchParams(model, enableWebSearch),
diff --git a/src/renderer/src/config/models/utils.ts b/src/renderer/src/config/models/utils.ts
index 621d75534..accf85e2c 100644
--- a/src/renderer/src/config/models/utils.ts
+++ b/src/renderer/src/config/models/utils.ts
@@ -10,7 +10,8 @@ import {
   isGPT51SeriesModel,
   isOpenAIChatCompletionOnlyModel,
   isOpenAIOpenWeightModel,
-  isOpenAIReasoningModel
+  isOpenAIReasoningModel,
+  isSupportVerbosityModel
 } from './openai'
 import { isQwenMTModel } from './qwen'
 import { isGenerateImageModel, isTextToImageModel, isVisionModel } from './vision'
@@ -157,7 +158,7 @@ const MODEL_SUPPORTED_VERBOSITY: readonly {
  * @returns An array of supported verbosity levels, always including `undefined` as the first element and `null` when applicable
  */
 export const getModelSupportedVerbosity = (model: Model | undefined | null): OpenAIVerbosity[] => {
-  if (!model) {
+  if (!model || !isSupportVerbosityModel(model)) {
     return [undefined]
   }
 
diff --git a/src/renderer/src/types/sdk.ts b/src/renderer/src/types/sdk.ts
index bb76c8a63..2b51bee3f 100644
--- a/src/renderer/src/types/sdk.ts
+++ b/src/renderer/src/types/sdk.ts
@@ -128,10 +128,6 @@ export type OpenAIExtraBody = {
     source_lang: 'auto'
     target_lang: string
   }
-  // for gpt-5 series models verbosity control
-  text?: {
-    verbosity?: 'low' | 'medium' | 'high'
-  }
 }
 // image is for openrouter. audio is ignored for now
 export type OpenAIModality = OpenAI.ChatCompletionModality | 'image'