diff --git a/src/renderer/src/aiCore/utils/reasoning.ts b/src/renderer/src/aiCore/utils/reasoning.ts
index 10afbbaf5f..ca1d03966a 100644
--- a/src/renderer/src/aiCore/utils/reasoning.ts
+++ b/src/renderer/src/aiCore/utils/reasoning.ts
@@ -10,6 +10,7 @@ import {
   GEMINI_FLASH_MODEL_REGEX,
   getModelSupportedReasoningEffortOptions,
   isDeepSeekHybridInferenceModel,
+  isDoubaoSeed18Model,
   isDoubaoSeedAfter251015,
   isDoubaoThinkingAutoModel,
   isGemini3ThinkingTokenModel,
@@ -389,7 +390,7 @@ export function getReasoningEffort(assistant: Assistant, model: Model): Reasonin
 
   // Use thinking, doubao, zhipu, etc.
   if (isSupportedThinkingTokenDoubaoModel(model)) {
-    if (isDoubaoSeedAfter251015(model)) {
+    if (isDoubaoSeedAfter251015(model) || isDoubaoSeed18Model(model)) {
       return { reasoningEffort }
     }
     if (reasoningEffort === 'high') {
diff --git a/src/renderer/src/config/models/__tests__/reasoning.test.ts b/src/renderer/src/config/models/__tests__/reasoning.test.ts
index ded3f9cc77..ba7af37f17 100644
--- a/src/renderer/src/config/models/__tests__/reasoning.test.ts
+++ b/src/renderer/src/config/models/__tests__/reasoning.test.ts
@@ -733,6 +733,11 @@ describe('getThinkModelType - Comprehensive Coverage', () => {
       expect(getThinkModelType(createModel({ id: 'doubao-seed-1-6-lite-251015' }))).toBe('doubao_after_251015')
     })
 
+    it('should return doubao_after_251015 for Doubao-Seed-1.8 models', () => {
+      expect(getThinkModelType(createModel({ id: 'doubao-seed-1-8-251215' }))).toBe('doubao_after_251015')
+      expect(getThinkModelType(createModel({ id: 'doubao-seed-1.8' }))).toBe('doubao_after_251015')
+    })
+
     it('should return doubao_no_auto for other Doubao thinking models', () => {
       expect(getThinkModelType(createModel({ id: 'doubao-1.5-thinking-vision-pro' }))).toBe('doubao_no_auto')
     })
@@ -863,6 +868,7 @@ describe('getThinkModelType - Comprehensive Coverage', () => {
       // auto > after_251015 > no_auto
       expect(getThinkModelType(createModel({ id: 'doubao-seed-1.6' }))).toBe('doubao')
       expect(getThinkModelType(createModel({ id: 'doubao-seed-1-6-251015' }))).toBe('doubao_after_251015')
+      expect(getThinkModelType(createModel({ id: 'doubao-seed-1-8-251215' }))).toBe('doubao_after_251015')
       expect(getThinkModelType(createModel({ id: 'doubao-1.5-thinking-vision-pro' }))).toBe('doubao_no_auto')
     })
 
diff --git a/src/renderer/src/config/models/default.ts b/src/renderer/src/config/models/default.ts
index d7b0e885d0..66368d35fe 100644
--- a/src/renderer/src/config/models/default.ts
+++ b/src/renderer/src/config/models/default.ts
@@ -746,6 +746,12 @@ export const SYSTEM_MODELS: Record<SystemProviderId | 'defaultModel', Model[]> =
     }
   ],
   doubao: [
+    {
+      id: 'doubao-seed-1-8-251215',
+      provider: 'doubao',
+      name: 'Doubao-Seed-1.8',
+      group: 'Doubao-Seed-1.8'
+    },
     {
       id: 'doubao-1-5-vision-pro-32k-250115',
       provider: 'doubao',
diff --git a/src/renderer/src/config/models/reasoning.ts b/src/renderer/src/config/models/reasoning.ts
index 4b0e293f40..14174d1629 100644
--- a/src/renderer/src/config/models/reasoning.ts
+++ b/src/renderer/src/config/models/reasoning.ts
@@ -146,7 +146,7 @@ const _getThinkModelType = (model: Model): ThinkingModelType => {
   } else if (isSupportedThinkingTokenDoubaoModel(model)) {
     if (isDoubaoThinkingAutoModel(model)) {
       thinkingModelType = 'doubao'
-    } else if (isDoubaoSeedAfter251015(model)) {
+    } else if (isDoubaoSeedAfter251015(model) || isDoubaoSeed18Model(model)) {
       thinkingModelType = 'doubao_after_251015'
     } else {
       thinkingModelType = 'doubao_no_auto'
@@ -457,7 +457,7 @@ export function isQwenAlwaysThinkModel(model?: Model): boolean {
 
 // Doubao 支持思考模式的模型正则
 export const DOUBAO_THINKING_MODEL_REGEX =
-  /doubao-(?:1[.-]5-thinking-vision-pro|1[.-]5-thinking-pro-m|seed-1[.-]6(?:-flash)?(?!-(?:thinking)(?:-|$))|seed-code(?:-preview)?(?:-\d+)?)(?:-[\w-]+)*/i
+  /doubao-(?:1[.-]5-thinking-vision-pro|1[.-]5-thinking-pro-m|seed-1[.-][68](?:-flash)?(?!-(?:thinking)(?:-|$))|seed-code(?:-preview)?(?:-\d+)?)(?:-[\w-]+)*/i
 
 // 支持 auto 的 Doubao 模型 doubao-seed-1.6-xxx doubao-seed-1-6-xxx  doubao-1-5-thinking-pro-m-xxx
 // Auto thinking is no longer supported after version 251015, see https://console.volcengine.com/ark/region:ark+cn-beijing/model/detail?Id=doubao-seed-1-6
@@ -475,6 +475,11 @@ export function isDoubaoSeedAfter251015(model: Model): boolean {
   return result
 }
 
+export function isDoubaoSeed18Model(model: Model): boolean {
+  const pattern = /doubao-seed-1[.-]8(?:-[\w-]+)?/i
+  return pattern.test(model.id) || pattern.test(model.name)
+}
+
 export function isSupportedThinkingTokenDoubaoModel(model?: Model): boolean {
   if (!model) {
     return false
diff --git a/src/renderer/src/config/models/tooluse.ts b/src/renderer/src/config/models/tooluse.ts
index 50890aaf8d..66e2dcc209 100644
--- a/src/renderer/src/config/models/tooluse.ts
+++ b/src/renderer/src/config/models/tooluse.ts
@@ -25,7 +25,7 @@ export const FUNCTION_CALLING_MODELS = [
   'learnlm(?:-[\\w-]+)?',
   'gemini(?:-[\\w-]+)?', // 提前排除了gemini的嵌入模型
   'grok-3(?:-[\\w-]+)?',
-  'doubao-seed-1[.-]6(?:-[\\w-]+)?',
+  'doubao-seed-1[.-][68](?:-[\\w-]+)?',
   'doubao-seed-code(?:-[\\w-]+)?',
   'kimi-k2(?:-[\\w-]+)?',
   'ling-\\w+(?:-[\\w-]+)?',
diff --git a/src/renderer/src/config/models/vision.ts b/src/renderer/src/config/models/vision.ts
index 183ec99433..fe4bc9912c 100644
--- a/src/renderer/src/config/models/vision.ts
+++ b/src/renderer/src/config/models/vision.ts
@@ -45,7 +45,7 @@ const visionAllowedModels = [
   'deepseek-vl(?:[\\w-]+)?',
   'kimi-latest',
   'gemma-3(?:-[\\w-]+)',
-  'doubao-seed-1[.-]6(?:-[\\w-]+)?',
+  'doubao-seed-1[.-][68](?:-[\\w-]+)?',
   'doubao-seed-code(?:-[\\w-]+)?',
   'kimi-thinking-preview',
   `gemma3(?:[-:\\w]+)?`,