diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx b/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx
index 92d10d2a2..b4acba71b 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/ConversationModelSelect.tsx
@@ -1,5 +1,5 @@
 import { Check, ChevronDown, RefreshCcw } from 'lucide-react';
-import { useCallback, useEffect, useState } from 'react';
+import { useCallback, useEffect, useRef, useState } from 'react';
 
 import { resolveTauriInvoke } from '../../app/tauri';
 import type { GameCreatorAppConfigView } from '../../app/types';
@@ -9,21 +9,26 @@ import {
 } from '../../services/clientApi';
 
 export function ConversationModelSelect({
+  className,
   disabled,
+  lazy = false,
   onReady,
 }: {
+  className?: string;
   disabled: boolean;
-  onReady: (ready: boolean) => void;
+  lazy?: boolean;
+  onReady?: (ready: boolean) => void;
 }) {
   const [models, setModels] = useState<ClientLlmModel[]>([]);
   const [selected, setSelected] = useState('');
-  const [busy, setBusy] = useState(true);
+  const [busy, setBusy] = useState(!lazy);
   const [error, setError] = useState('');
   const [open, setOpen] = useState(false);
+  const initializedRef = useRef(false);
   const refresh = useCallback(async () => {
     setBusy(true);
     setError('');
-    onReady(false);
+    onReady?.(false);
     try {
       const invoke = resolveTauriInvoke();
       if (!invoke) throw new Error('Native host unavailable');
@@ -43,7 +48,7 @@ export function ConversationModelSelect({
         if (saved.config.selectedModelId !== id)
           throw new Error('Default selection was not saved');
       }
-      onReady(available);
+      onReady?.(available);
       if (!available) setError('请选择可用模型');
     } catch {
       setModels([]);
@@ -54,11 +59,12 @@ export function ConversationModelSelect({
   }, [onReady]);
 
   useEffect(() => {
+    if (lazy) return;
     void refresh();
-  }, [refresh]);
+  }, [refresh, lazy]);
 
   async function select(id: string) {
-    onReady(false);
+    onReady?.(false);
     setBusy(true);
     setError('');
     try {
@@ -71,7 +77,7 @@ export function ConversationModelSelect({
       if (result.config.selectedModelId !== id)
         throw new Error('Selection was not saved');
       setSelected(id);
-      onReady(true);
+      onReady?.(true);
     } catch {
       setError('模型选择保存失败');
     } finally {
@@ -80,7 +86,13 @@ export function ConversationModelSelect({
   }
 
   return (
-    <div className="conversation-model-select">
+    <div
+      className={
+        className
+          ? `conversation-model-select ${className}`
+          : 'conversation-model-select'
+      }
+    >
       {error ? <span role="alert">{error}</span> : null}
       <button
         type="button"
@@ -88,8 +100,14 @@ export function ConversationModelSelect({
         aria-label="对话模型"
         aria-haspopup="listbox"
         aria-expanded={open}
-        disabled={disabled || busy}
-        onClick={() => setOpen((current) => !current)}
+        disabled={disabled}
+        onClick={() => {
+          if (lazy && !initializedRef.current) {
+            initializedRef.current = true;
+            void refresh();
+          }
+          setOpen((current) => !current);
+        }}
       >
         <span
           className="conversation-model-trigger-status"
@@ -107,6 +125,11 @@ export function ConversationModelSelect({
           role="listbox"
           aria-label="对话模型"
         >
+          {busy && models.length === 0 ? (
+            <span className="conversation-model-menu-loading">
+              正在读取模型
+            </span>
+          ) : null}
           {models.map((model) => (
             <button
               key={model.id}
diff --git a/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx b/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
index 2c04e0227..2c7f7eab7 100644
--- a/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
+++ b/apps/ai-game-creator-shell/src/features/project-workspace/ProjectSupervisorView.tsx
@@ -339,7 +339,9 @@ export function ProjectSupervisorView({
           />
           {directCodex ? (
             <ConversationModelSelect
-              disabled={runtimePanelProps.controlBusy || needsUserInput}
+              // 允许在对话进行中切换模型：写回的是客户端配置，只影响后续轮次，
+              // 当前回合不受影响；发送按钮仍由 controlBusy / modelReady 把关。
+              disabled={needsUserInput}
               onReady={setModelReady}
             />
           ) : null}
diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index 02de332a1..bb1f1273d 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -8397,7 +8397,11 @@ iframe.preview-frame {
   max-width: calc(100% - 64px);
   pointer-events: auto;
 }
-.project-supervisor-surface.is-direct-codex .conversation-model-trigger {
+.home-input-model-select {
+  position: relative;
+  min-width: 0;
+}
+.conversation-model-trigger {
   display: inline-flex;
   align-items: center;
   gap: 6px;
@@ -8439,8 +8443,8 @@ iframe.preview-frame {
 }
 .conversation-model-menu {
   position: absolute;
-  right: 46px;
-  bottom: 43px;
+  right: 0;
+  bottom: calc(100% + 8px);
   z-index: 20;
   display: grid;
   min-width: 150px;
@@ -8478,6 +8482,14 @@ iframe.preview-frame {
   color: var(--platform-text-strong, #111827);
   outline: none;
 }
+.conversation-model-menu-loading {
+  display: flex;
+  align-items: center;
+  min-height: 32px;
+  padding: 0 9px;
+  color: var(--platform-text-soft, #6b7280);
+  font-size: 12px;
+}
 .game-workbench-chat
   .project-supervisor-surface.is-direct-codex
   .project-supervisor-composer
diff --git a/apps/ai-game-creator-shell/src/view/home/index.tsx b/apps/ai-game-creator-shell/src/view/home/index.tsx
index fccea7b6d..bdf8c5306 100644
--- a/apps/ai-game-creator-shell/src/view/home/index.tsx
+++ b/apps/ai-game-creator-shell/src/view/home/index.tsx
@@ -14,6 +14,7 @@ import { useRef, useState } from 'react';
 
 import BRAND_ICON from '../../../../../packages/shared/src/icons/taonier-product-ip.png';
 import type { ProjectStartMode } from '../../app/types';
+import { ConversationModelSelect } from '../../features/project-workspace/ConversationModelSelect';
 import RichInputArea, { UploadButton } from './components/RichInputArea';
 import {
   richTextToAttachments,
@@ -240,7 +241,14 @@ export default function HomeView({
             }}
           >
             <div className="grid grid-cols-[1fr_auto] items-center gap-2.5 text-[12px] text-(--platform-text-soft)">
-              <UploadButton />
+              <div className="flex min-w-0 items-center gap-1.5">
+                <UploadButton />
+                <ConversationModelSelect
+                  className="home-input-model-select"
+                  disabled={homeCreationBusy}
+                  lazy
+                />
+              </div>
               <button
                 className="grid size-7 cursor-pointer place-items-center rounded-full border-0 bg-(image:--platform-button-primary-fill) p-0 text-(--platform-button-primary-text) shadow-(--platform-profile-action-shadow) transition-transform hover:scale-105 disabled:cursor-not-allowed disabled:opacity-55"
                 type="submit"
diff --git a/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts
index e83a74396..dd609362e 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/home.suite.ts
@@ -62,6 +62,46 @@ function ApprovedGddStartHarness() {
 }
 
 export function registerClientHomeTests() {
+  it('adds a model selector to the home composer and lazily loads the catalog on open', async () => {
+    const invoke = vi.fn(async (command: string, args?: unknown) => {
+      if (command === 'read_game_creator_app_config') {
+        return { config: { selectedModelId: 'quality' } };
+      }
+      if (command === 'select_game_creator_model') {
+        return {
+          config: { selectedModelId: (args as { modelId: string }).modelId },
+        };
+      }
+      throw new Error(`unexpected invoke ${command}`);
+    });
+    window.__TAURI__ = { core: { invoke } };
+    renderLauncherAt('/?launcher');
+
+    // Lazy: the home composer must not read config or load models on mount.
+    expect(invoke).not.toHaveBeenCalledWith(
+      'read_game_creator_app_config',
+      expect.anything(),
+    );
+    const modelTrigger = await screen.findByRole('button', {
+      name: '对话模型',
+    });
+    const createButton = screen.getByRole('button', { name: '开启创作' });
+    expect(createButton).toHaveProperty('disabled', false);
+
+    fireEvent.click(modelTrigger);
+    await waitFor(() =>
+      expect(screen.getByRole('option', { name: '快速' })).not.toBeNull(),
+    );
+    fireEvent.click(screen.getByRole('option', { name: '快速' }));
+    await waitFor(() =>
+      expect(invoke).toHaveBeenCalledWith('select_game_creator_model', {
+        modelId: 'fast',
+      }),
+    );
+    expect(modelTrigger.textContent).toContain('快速');
+    expect(createButton).toHaveProperty('disabled', false);
+  });
+
   it('anchors the empty home input placeholder to the editor while the page scrolls', () => {
     renderLauncherAt('/?launcher');
 
diff --git a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
index 79815398b..64373c01d 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
@@ -4695,6 +4695,50 @@ export function registerUserSurfaceBoundaryTests() {
 }
 
 export function registerProjectSupervisorSurfaceTests() {
+  it('allows selecting the model on the first direct-project entry', async () => {
+    const projectPath = '/tmp/first-entry-model-select';
+    const manifest = createGameCreationAppManifest(
+      'first-entry-model-select',
+      '首次进入模型选择',
+    );
+    const supervisorHarness = createProjectSupervisorRuntimeHarness({
+      projectPath,
+      initialSessionExists: false,
+    });
+    const invoke = vi.fn(
+      async (command: string, args?: Record<string, unknown>) => {
+        if (command === 'get_local_game_manifest') {
+          return manifest;
+        }
+        return supervisorHarness.invoke(command, args);
+      },
+    );
+    window.__TAURI__ = {
+      core: { invoke },
+      event: { listen: supervisorHarness.listen },
+    };
+
+    render(
+      React.createElement(App, {
+        initialProjectPath: projectPath,
+        initialProjectManifest: manifest,
+        projectSupervisorOnly: true,
+      }),
+    );
+
+    const surface = await screen.findByLabelText('陶泥儿项目对话');
+    const trigger = within(surface).getByRole('button', { name: '对话模型' });
+    await waitFor(() => expect(trigger.hasAttribute('disabled')).toBe(false));
+    fireEvent.click(trigger);
+    await waitFor(() =>
+      expect(
+        within(surface).getByRole('option', { name: '快速' }),
+      ).not.toBeNull(),
+    );
+    fireEvent.click(within(surface).getByRole('option', { name: '快速' }));
+    await waitFor(() => expect(trigger.textContent).toContain('快速'));
+  });
+
   it('runs a top workbench play request without a second confirmation', async () => {
     const projectPath = '/tmp/top-play-request';
     const supervisorHarness = createProjectSupervisorRuntimeHarness({
diff --git a/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md b/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md
index d70a5d096..43b17d928 100644
--- a/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md
+++ b/docs/technical/【技术方案】AGC后台模型别名与对话选择-2026-09-05.md
@@ -8,6 +8,8 @@
 - `GET /api/llm/models` 返回启用项的 `id/displayName` 和 `defaultModelId`，不返回实际模型名、Router 目录、凭据或能力原始数据。
 - AGC Responses 请求的 `model` 是稳定目录标识。服务端按当前目录映射实际模型名；未知、停用项拒绝，不回退其它模型。旧客户端无 AGC 标记时使用后台默认项。
 - 输入框右下角选择模型，只显示别名；选择保存到客户端配置 `selectedModelId`，从下一次请求生效。加载失败或选项停用时禁用提交并允许刷新，不显示实际 ID 作为兜底文案。
+- 首页聊天框架的右下角同样提供模型选择入口（与项目对话右侧一致）。首页入口按需加载模型目录（首次展开才请求），选择仅影响后续创建/发送的轮次，不阻塞「开启创作」，因此模型目录不可用时仍可创建项目并使用后台默认项。
+- 项目右侧对话的模型选择器在对话进行中保持可交互：切换模型只写回客户端配置并作用于下一轮，当前回合不受影响；发送按钮仍由 `controlBusy` / `modelReady` 把关。
 - 设置页恢复到布局改版前的官方代理版本，不包含模型管理或模型选择，保留配置安全清理和官方代理锁定。
 
 ## 验收