diff --git a/web/src/components/AssistantChat/modelOptions.test.ts b/web/src/components/AssistantChat/modelOptions.test.ts
index 438a0cc6..4b01e1e3 100644
--- a/web/src/components/AssistantChat/modelOptions.test.ts
+++ b/web/src/components/AssistantChat/modelOptions.test.ts
@@ -89,7 +89,7 @@ describe('getModelOptionsForFlavor', () => {
     it('returns only default/current for cursor before models are discovered (no claude fallback)', () => {
         const options = getModelOptionsForFlavor('cursor', 'composer-2.5')
         expect(options).toEqual([
-            { value: null, label: 'Default' },
+            { value: null, label: 'Auto' },
             { value: 'composer-2.5', label: 'composer-2.5' }
         ])
     })
@@ -108,12 +108,12 @@ describe('getModelOptionsForFlavor', () => {
     it('does not inject raw wire id when dual picker base is already listed', () => {
         const wire = 'claude-opus-4-8[thinking=true,context=300k,effort=high,fast=false]'
         const options = getModelOptionsForFlavor('cursor', wire, [
-            { value: null, label: 'Default' },
+            { value: null, label: 'Auto' },
             { value: 'claude-opus-4-8', label: 'Claude Opus 4.8' },
             { value: 'composer-2.5', label: 'Composer 2.5' },
         ])
         expect(options).toEqual([
-            { value: null, label: 'Default' },
+            { value: null, label: 'Auto' },
             { value: 'claude-opus-4-8', label: 'Claude Opus 4.8' },
             { value: 'composer-2.5', label: 'Composer 2.5' },
         ])
@@ -122,11 +122,11 @@ describe('getModelOptionsForFlavor', () => {
     it('injects unknown wire id only when catalog lacks base and wire', () => {
         const wire = 'claude-opus-4-9[effort=high,fast=false]'
         const options = getModelOptionsForFlavor('cursor', wire, [
-            { value: null, label: 'Default' },
+            { value: null, label: 'Auto' },
             { value: 'composer-2.5', label: 'Composer 2.5' },
         ])
         expect(options).toEqual([
-            { value: null, label: 'Default' },
+            { value: null, label: 'Auto' },
             { value: wire, label: wire },
             { value: 'composer-2.5', label: 'Composer 2.5' },
         ])
diff --git a/web/src/components/AssistantChat/modelOptions.ts b/web/src/components/AssistantChat/modelOptions.ts
index 7e4aed68..0f017fec 100644
--- a/web/src/components/AssistantChat/modelOptions.ts
+++ b/web/src/components/AssistantChat/modelOptions.ts
@@ -1,4 +1,5 @@
 import { MODEL_OPTIONS } from '@/components/NewSession/types'
+import { CURSOR_AUTO_MODEL_LABEL } from '@/lib/cursorModelOptions'
 import { getClaudeComposerModelOptions, getNextClaudeComposerModel } from './claudeModelOptions'
 import type { ClaudeComposerModelOption } from './claudeModelOptions'
 
@@ -120,7 +121,7 @@ export function getModelOptionsForFlavor(
         return []
     }
     if (flavor === 'cursor') {
-        return withCurrentModelOption([{ value: null, label: 'Default' }], currentModel)
+        return withCurrentModelOption([{ value: null, label: CURSOR_AUTO_MODEL_LABEL }], currentModel)
     }
     // Kimi has no predefined model list — show just the auto/default option.
     if (flavor === 'kimi') {
diff --git a/web/src/components/NewSession/newSessionCursorModels.test.ts b/web/src/components/NewSession/newSessionCursorModels.test.ts
index 07e354ad..1c574074 100644
--- a/web/src/components/NewSession/newSessionCursorModels.test.ts
+++ b/web/src/components/NewSession/newSessionCursorModels.test.ts
@@ -97,7 +97,7 @@ describe('flat vs dual cursor model pickers', () => {
         const options = buildNewSessionCursorModelOptions(picker)
         expect(picker.mode).toBe('flat')
         expect(options).toEqual([
-            { value: 'auto', label: 'Default' },
+            { value: 'auto', label: 'Auto' },
             {
                 value: 'claude-opus-4-7[thinking=true,context=300k,effort=xhigh,fast=false]',
                 label: 'claude-opus-4-7 · thinking=true,context=300k,effort=xhigh,fast=false'
@@ -110,7 +110,7 @@ describe('flat vs dual cursor model pickers', () => {
         const picker = buildNewSessionCursorPickerState([...acpModels], 'auto')
         expect(picker.mode).toBe('dual')
         expect(buildNewSessionCursorModelOptions(picker)).toEqual([
-            { value: 'auto', label: 'Default' },
+            { value: 'auto', label: 'Auto' },
             { value: 'composer-2.5', label: 'composer-2.5' },
         ])
     })
@@ -154,7 +154,7 @@ describe('probe slug catalog (New Session cold start)', () => {
         ]
         const picker = buildNewSessionCursorPickerState(probeOnly, 'composer-2.5')
         expect(picker.mode).toBe('flat')
-        expect(picker.modelOptions).toEqual([{ value: 'auto', label: 'Default' }])
+        expect(picker.modelOptions).toEqual([{ value: 'auto', label: 'Auto' }])
         expect(picker.effortOptions).toEqual([])
         expect(shouldShowCursorModelsUnavailable({
             agent: 'cursor',
@@ -169,7 +169,7 @@ describe('new session cursor model options', () => {
     it('maps base options with auto default and raw variant labels', () => {
         const picker = buildNewSessionCursorPickerState([...acpModels], 'composer-2.5[fast=true]')
         expect(buildNewSessionCursorModelOptions(picker)).toEqual([
-            { value: 'auto', label: 'Default' },
+            { value: 'auto', label: 'Auto' },
             { value: 'composer-2.5', label: 'composer-2.5' },
         ])
         expect(buildNewSessionCursorEffortOptions(picker)).toEqual([
diff --git a/web/src/lib/cursorModelOptions.test.ts b/web/src/lib/cursorModelOptions.test.ts
index 1f943c7b..5690b064 100644
--- a/web/src/lib/cursorModelOptions.test.ts
+++ b/web/src/lib/cursorModelOptions.test.ts
@@ -3,6 +3,7 @@ import {
     buildCursorEffortPickerOptions,
     buildCursorModelCatalog,
     buildFlatCursorModelPickerOptions,
+    CURSOR_AUTO_MODEL_LABEL,
     cursorCatalogHasMultiVariantBases,
     shouldUseCursorDualPickers,
     cursorEffortPickerLabel,
@@ -56,7 +57,7 @@ describe('buildCursorModelCatalog', () => {
     it('groups exact ACP wire variants by raw base id and sorts model bases', () => {
         const catalog = buildCursorModelCatalog([...acpModels])
         expect(catalog.baseOptions.map((o) => o.label)).toEqual([
-            'Default',
+            CURSOR_AUTO_MODEL_LABEL,
             'claude-opus-4-8',
             'composer-2.5',
         ])
@@ -102,7 +103,7 @@ describe('picker labels and modes', () => {
         ], { defaultValue: 'auto' })
         expect(cursorCatalogHasMultiVariantBases(catalog)).toBe(false)
         expect(buildFlatCursorModelPickerOptions(catalog, { defaultValue: 'auto' })).toEqual([
-            { value: 'auto', label: 'Default' },
+            { value: 'auto', label: CURSOR_AUTO_MODEL_LABEL },
             {
                 value: 'claude-opus-4-7[thinking=true,context=300k,effort=xhigh,fast=false]',
                 label: 'claude-opus-4-7 · thinking=true,context=300k,effort=xhigh,fast=false'
@@ -129,7 +130,7 @@ describe('picker labels and modes', () => {
             { modelId: 'composer-2.5[fast=false]', name: 'Composer 2.5' },
         ], { defaultValue: 'auto' })
         expect(buildFlatCursorModelPickerOptions(catalog, { defaultValue: 'auto' })).toEqual([
-            { value: 'auto', label: 'Default' },
+            { value: 'auto', label: CURSOR_AUTO_MODEL_LABEL },
             { value: 'composer-2.5[fast=true]', label: 'fast=true' },
             { value: 'composer-2.5[fast=false]', label: 'fast=false' },
         ])
diff --git a/web/src/lib/cursorModelOptions.ts b/web/src/lib/cursorModelOptions.ts
index 3d71c698..d871a13e 100644
--- a/web/src/lib/cursorModelOptions.ts
+++ b/web/src/lib/cursorModelOptions.ts
@@ -15,6 +15,9 @@ export type CursorModelCatalog = {
     wireToBase: Map<string, string>
 }
 
+/** User-facing label for Cursor automatic model selection (`auto` / ACP `default[]`). */
+export const CURSOR_AUTO_MODEL_LABEL = 'Auto'
+
 /** Base model id before ACP wire suffix, e.g. `composer-2.5[fast=true]` → `composer-2.5`. */
 export function cursorModelBaseId(modelId: string): string {
     const trimmed = modelId.trim()
@@ -134,7 +137,7 @@ export function cursorVariantDisambiguationSuffix(modelId: string): string {
 
 /**
  * Group ACP wire ids by raw base model. Labels are raw base ids; variant labels are raw suffixes.
- * Catalog order follows the input order; only `Default` is prepended.
+ * Catalog order follows the input order; only "Auto" is prepended.
  */
 export function buildCursorModelCatalog(
     availableModels: readonly CursorModelSummary[],
@@ -185,7 +188,7 @@ export function buildCursorModelCatalog(
         .sort((a, b) => a[1].localeCompare(b[1], undefined, { sensitivity: 'base' }))
 
     const baseOptions: CursorModelOption[] = [
-        { value: defaultValue, label: 'Default' },
+        { value: defaultValue, label: CURSOR_AUTO_MODEL_LABEL },
         ...sortedBaseEntries.map(([baseId, label]) => ({ value: baseId, label }))
     ]
 
@@ -312,7 +315,7 @@ export function buildFlatCursorModelPickerOptions(
     }
 
     return [
-        { value: defaultValue ?? 'auto', label: 'Default' },
+        { value: defaultValue ?? 'auto', label: CURSOR_AUTO_MODEL_LABEL },
         ...rows
     ]
 }
diff --git a/web/src/lib/locales/en.ts b/web/src/lib/locales/en.ts
index 112a620e..67342506 100644
--- a/web/src/lib/locales/en.ts
+++ b/web/src/lib/locales/en.ts
@@ -269,7 +269,7 @@ export default {
   'newSession.model.optional': 'optional',
   'newSession.model.loadFailed': 'Failed to load models',
   'newSession.model.selectVariant': 'Select variant',
-  'newSession.model.cursorUnavailable': 'No Cursor models yet. Start a Cursor session once, or use Default.',
+  'newSession.model.cursorUnavailable': 'No Cursor models yet. Start a Cursor session once, or use Auto.',
   'newSession.opencodeModel.loading': 'Discovering OpenCode models…',
   'newSession.opencodeModel.loadFailed': 'Failed to load OpenCode models',
   'newSession.opencodeModel.retry': 'Retry',
diff --git a/web/src/lib/locales/zh-CN.ts b/web/src/lib/locales/zh-CN.ts
index 0378dc6e..499fdfdc 100644
--- a/web/src/lib/locales/zh-CN.ts
+++ b/web/src/lib/locales/zh-CN.ts
@@ -273,7 +273,7 @@ export default {
   'newSession.model.optional': '可选',
   'newSession.model.loadFailed': '加载模型失败',
   'newSession.model.selectVariant': '选择变体',
-  'newSession.model.cursorUnavailable': '暂无 Cursor 模型列表。请先运行一次 Cursor 会话，或使用默认模型。',
+  'newSession.model.cursorUnavailable': '暂无 Cursor 模型列表。请先运行一次 Cursor 会话，或使用 Auto。',
   'newSession.opencodeModel.loading': '正在发现 OpenCode 模型…',
   'newSession.opencodeModel.loadFailed': '加载 OpenCode 模型失败',
   'newSession.opencodeModel.retry': '重试',