diff --git a/wwwroot/agent/index.ui b/wwwroot/agent/index.ui
index d84c506..77b3860 100644
--- a/wwwroot/agent/index.ui
+++ b/wwwroot/agent/index.ui
@@ -18,7 +18,7 @@
                         "event": "click",
                         "actiontype": "script",
                         "target": "self",
-                        "script": "var tp=bricks.getWidgetById('session_tabs',bricks.app);if(!tp)return;var sid='s'+Date.now()+'_'+Math.floor(Math.random()*100000);var n=tp.opts.items.length+1;tp.open_tab({name:'session_'+sid,label:'会话 '+n,removable:true,content:{widgettype:'VBox',options:{css:'filler',width:'100%',height:'100%'},subwidgets:[{widgettype:'urlwidget',options:{url:'/pipeline_core/api/agent_menus.dspy?session_id='+sid,method:'GET'}},{widgettype:'AgentIO',options:{css:'filler',margin:'0 24px 24px 24px',url:'/pipeline_core/api/agent_chat.dspy?session_id='+sid,model_dataurl:'/pipeline_core/api/agent_model_options.dspy',model_cwidth:14,placeholder:'输入你的需求...'}}]}});"
+                        "script": "var tp=bricks.getWidgetById('session_tabs',bricks.app);if(!tp)return;var sid='s'+Date.now()+'_'+Math.floor(Math.random()*100000);var n=tp.opts.items.length+1;tp.open_tab({name:'session_'+sid,label:'会话 '+n,removable:true,content:{widgettype:'VBox',options:{css:'filler',width:'100%',height:'100%'},subwidgets:[{widgettype:'urlwidget',options:{url:'/pipeline_core/api/agent_menus.dspy?session_id='+sid,method:'GET'}},{widgettype:'AgentIO',options:{css:'filler',margin:'0 24px 24px 24px',url:'/pipeline_core/api/agent_chat.dspy?session_id='+sid,model_dataurl:'/pipeline_core/api/agent_model_options.dspy?session_id='+sid,model_cwidth:14,placeholder:'输入你的需求...'}}]}});"
                     }]
                 }
             ]
@@ -50,7 +50,7 @@
                                         "css": "filler",
                                         "margin": "0 24px 24px 24px",
                                         "url": "/pipeline_core/api/agent_chat.dspy?session_id=default",
-                                        "model_dataurl": "/pipeline_core/api/agent_model_options.dspy",
+                                        "model_dataurl": "/pipeline_core/api/agent_model_options.dspy?session_id=default",
                                         "model_cwidth": 14,
                                         "placeholder": "输入你的需求..."
                                     }
diff --git a/wwwroot/api/agent_chat.dspy b/wwwroot/api/agent_chat.dspy
index 82d7686..03f4d3d 100644
--- a/wwwroot/api/agent_chat.dspy
+++ b/wwwroot/api/agent_chat.dspy
@@ -80,12 +80,15 @@ if action == 'send_message':
     pipeline_id = (params_kw or {}).get('pipeline_id', '') or ''
 
     # ── 走 gateway 统一入口（Web AgentIO 通道）──
+    # model_id：前端模型下拉选中的模型 → gateway 校验后持久化到项目（项目模型一经设置
+    # 即生效，直到用户再次选择），空 = 沿用项目已设模型。
+    model_id = (params_kw or {}).get('model_id', '') or ''
     from pipeline_service.gateway import get_gateway
     gateway = get_gateway()
 
     async def agent_stream():
         _base = entire_url("/")
-        async for chunk in gateway.run_message("web", uid, prompt, base_url=_base, session_id=session_id, pipeline_id=pipeline_id):
+        async for chunk in gateway.run_message("web", uid, prompt, base_url=_base, session_id=session_id, pipeline_id=pipeline_id, model_id=model_id):
             data = json.loads(chunk)
             t = data.get('type', '')
 
diff --git a/wwwroot/api/agent_model_options.dspy b/wwwroot/api/agent_model_options.dspy
index f94bdbf..f0e1aab 100644
--- a/wwwroot/api/agent_model_options.dspy
+++ b/wwwroot/api/agent_model_options.dspy
@@ -1,11 +1,14 @@
 # agent_model_options.dspy - 返回 active 模型列表（供 AgentIO 模型选择下拉）
 # llm 表是 pipeline 库的通用配置，产线无关
 # org_id 多租户隔离：非系统级机构只看到本机构的模型（不含系统级兜底）
-# 返回每项带 selected 标记，标识个人之前选择的默认模型（default_llm_id）
+# selected 标记 = 当前项目的已设模型（sd_projects.default_model，产线通用、跨会话持久）；
+# 项目未设模型时回退个人全局选择（default_llm_id）。前端 UiCode 按 selected 恢复选中项，
+# 不再每次重建都回退第一项。
 
 dbname = get_module_dbname('pipeline_core')
 uid = await get_user()
 org_id = (await get_userorgid()) or ''
+session_id = (params_kw or {}).get('session_id', '') or ''
 
 async with DBPools().sqlorContext(dbname) as sor:
     sql = "SELECT id, name, provider, model_id, capabilities FROM llm WHERE status='active'"
@@ -16,7 +19,22 @@ async with DBPools().sqlorContext(dbname) as sor:
     sql += " ORDER BY name"
     recs = await sor.sqlExe(sql, params)
 
-    # 个人之前选择的默认模型
+    # 项目级模型（优先级最高）：按会话解析当前项目 → sd_projects.default_model。
+    # session_id 为空/无会话记录时自动回退全局设置，与消息链路的项目解析同一函数，不漂移。
+    project_model = ''
+    try:
+        from pipeline_service.workspace import get_session_project_id
+        _pid = await get_session_project_id(sor, uid or '', session_id)
+        if _pid:
+            _p = await sor.sqlExe(
+                "SELECT default_model FROM sd_projects WHERE id=${p}$", {"p": _pid})
+            await sor.sqlExe("COMMIT", {})
+            if _p:
+                project_model = getattr(_p[0], 'default_model', '') or ''
+    except Exception as e:
+        debug(f'agent_model_options project_model error: {e}')
+
+    # 个人之前选择的默认模型（项目未设模型时的回退选中项）
     current_llm_id = ''
     if uid:
         _s = await sor.sqlExe(
@@ -32,7 +50,7 @@ for r in recs:
         'provider': r.provider,
         'model_id': r.model_id,
         'capabilities': r.capabilities or 'text',
-        'selected': r.id == current_llm_id,
+        'selected': (r.name == project_model) if project_model else (r.id == current_llm_id),
     })
 
 return rows