diff --git a/package.json b/package.json
index 2198986545..66b42c208b 100644
--- a/package.json
+++ b/package.json
@@ -270,7 +270,7 @@
     "winston-daily-rotate-file": "^5.0.0",
     "word-extractor": "^1.0.4",
     "zipread": "^1.3.3",
-    "zod": "^3.25.74"
+    "zod": "^4.0.0"
   },
   "resolutions": {
     "pdf-parse@npm:1.1.1": "patch:pdf-parse@npm%3A1.1.1#~/.yarn/patches/pdf-parse-npm-1.1.1-04a6109b2a.patch",
diff --git a/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts b/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts
index 60173551b4..502756d5a1 100644
--- a/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts
+++ b/src/renderer/src/aiCore/clients/openai/OpenAIApiClient.ts
@@ -52,6 +52,7 @@ import {
 import { ChunkType, TextStartChunk, ThinkingStartChunk } from '@renderer/types/chunk'
 import { Message } from '@renderer/types/newMessage'
 import {
+  MistralDeltaSchema,
   OpenAISdkMessageParam,
   OpenAISdkParams,
   OpenAISdkRawChunk,
@@ -804,7 +805,8 @@ export class OpenAIAPIClient extends OpenAIBaseClient<
                 (typeof choice.delta.content === 'string' && choice.delta.content !== '') ||
                 (typeof (choice.delta as any).reasoning_content === 'string' &&
                   (choice.delta as any).reasoning_content !== '') ||
-                (typeof (choice.delta as any).reasoning === 'string' && (choice.delta as any).reasoning !== ''))
+                (typeof (choice.delta as any).reasoning === 'string' && (choice.delta as any).reasoning !== '') ||
+                Array.isArray(choice.delta.content))
             ) {
               contentSource = choice.delta
             } else if ('message' in choice) {
@@ -815,8 +817,15 @@ export class OpenAIAPIClient extends OpenAIBaseClient<
             if (!contentSource?.content) {
               accumulatingText = false
             }
-            // @ts-ignore - reasoning_content is not in standard OpenAI types but some providers use it
-            if (!contentSource?.reasoning_content && !contentSource?.reasoning) {
+            const mistralDelta = MistralDeltaSchema.safeParse(contentSource?.content)
+
+            if (
+              // @ts-ignore - reasoning_content is not in standard OpenAI types but some providers use it
+              !contentSource?.reasoning_content &&
+              // @ts-ignore - reasoning is not in standard OpenAI types but some providers use it
+              !contentSource?.reasoning &&
+              (mistralDelta.data?.[0]?.type !== 'thinking' || !mistralDelta.success)
+            ) {
               isThinking = false
             }
 
@@ -850,12 +859,14 @@ export class OpenAIAPIClient extends OpenAIBaseClient<
             }
 
             // 处理推理内容 (e.g. from OpenRouter DeepSeek-R1)
-            // @ts-ignore - reasoning_content is not in standard OpenAI types but some providers use it
-            const reasoningText = contentSource.reasoning_content || contentSource.reasoning
+            const reasoningText =
+              // @ts-ignore - reasoning_content is not in standard OpenAI types but some providers use it
+              contentSource.reasoning_content ||
+              // @ts-ignore - reasoning_content is not in standard OpenAI types but some providers use it
+              contentSource.reasoning ||
+              (mistralDelta.data?.[0]?.type === 'thinking' ? mistralDelta.data?.[0]?.thinking[0]?.text : undefined)
             if (reasoningText) {
-              // logger.silly('since reasoningText is trusy, try to enqueue THINKING_START AND THINKING_DELTA')
               if (!isThinking) {
-                // logger.silly('since isThinking is falsy, try to enqueue THINKING_START')
                 controller.enqueue({
                   type: ChunkType.THINKING_START
                 } as ThinkingStartChunk)
@@ -872,22 +883,35 @@ export class OpenAIAPIClient extends OpenAIBaseClient<
             }
 
             // 处理文本内容
-            if (contentSource.content) {
-              // logger.silly('since contentSource.content is trusy, try to enqueue TEXT_START and TEXT_DELTA')
+            if (mistralDelta.success && mistralDelta.data?.[0]?.type === 'text') {
               if (!accumulatingText) {
-                // logger.silly('enqueue TEXT_START')
                 controller.enqueue({
                   type: ChunkType.TEXT_START
                 } as TextStartChunk)
                 accumulatingText = true
               }
-              // logger.silly('enqueue TEXT_DELTA')
               controller.enqueue({
                 type: ChunkType.TEXT_DELTA,
-                text: contentSource.content
+                text: mistralDelta.data?.[0]?.text
               })
-            } else {
-              accumulatingText = false
+            } else if (!mistralDelta.success) {
+              if (contentSource.content) {
+                // logger.silly('since contentSource.content is trusy, try to enqueue TEXT_START and TEXT_DELTA')
+                if (!accumulatingText) {
+                  // logger.silly('enqueue TEXT_START')
+                  controller.enqueue({
+                    type: ChunkType.TEXT_START
+                  } as TextStartChunk)
+                  accumulatingText = true
+                }
+                // logger.silly('enqueue TEXT_DELTA')
+                controller.enqueue({
+                  type: ChunkType.TEXT_DELTA,
+                  text: contentSource.content
+                })
+              } else {
+                accumulatingText = false
+              }
             }
 
             // 处理工具调用
diff --git a/src/renderer/src/types/sdk.ts b/src/renderer/src/types/sdk.ts
index a5413e54fb..a8a208523e 100644
--- a/src/renderer/src/types/sdk.ts
+++ b/src/renderer/src/types/sdk.ts
@@ -23,6 +23,7 @@ import {
 } from '@google/genai'
 import OpenAI, { AzureOpenAI } from 'openai'
 import { Stream } from 'openai/streaming'
+import * as z from 'zod'
 
 import { EndpointType } from './index'
 
@@ -260,3 +261,19 @@ export interface AwsBedrockSdkToolCall {
   input: any
   toolUseId: string
 }
+
+export const MistralDeltaTextSchema = z.object({
+  type: z.literal('text'),
+  text: z.string()
+})
+
+export const MistralDeltaThinkingSchema = z.object({
+  type: z.literal('thinking'),
+  thinking: z.array(MistralDeltaTextSchema)
+})
+
+export const MistralDeltaSchema = z.array(
+  z.discriminatedUnion('type', [MistralDeltaTextSchema, MistralDeltaThinkingSchema])
+)
+
+export type MistralDelta = z.infer<typeof MistralDeltaSchema>
diff --git a/yarn.lock b/yarn.lock
index c970bca393..efcc401c00 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8650,7 +8650,7 @@ __metadata:
     winston-daily-rotate-file: "npm:^5.0.0"
     word-extractor: "npm:^1.0.4"
     zipread: "npm:^1.3.3"
-    zod: "npm:^3.25.74"
+    zod: "npm:^4.0.0"
   languageName: unknown
   linkType: soft
 
@@ -22669,10 +22669,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"zod@npm:^3.25.74":
-  version: 3.25.74
-  resolution: "zod@npm:3.25.74"
-  checksum: 10c0/59e38b046ac333b5bd1ba325a83b6798721227cbfb1e69dfc7159bd7824b904241ab923026edb714fafefec3624265ae374a70aee9a5a45b365bd31781ffa105
+"zod@npm:^4.0.0":
+  version: 4.0.17
+  resolution: "zod@npm:4.0.17"
+  checksum: 10c0/c56ef4cc02f8f52be8724c5a8b338266202d68477c7606bee9b7299818b75c9adc27f16f4b6704a372f3e7578bd016f389de19bfec766564b7c39d0d327c540a
   languageName: node
   linkType: hard