diff --git a/changelog.d/1502-workflow-model.added.md b/changelog.d/1502-workflow-model.added.md
new file mode 100644
index 000000000..bc3004a34
--- /dev/null
+++ b/changelog.d/1502-workflow-model.added.md
@@ -0,0 +1 @@
+Workflow graphs now support choosing a model for the whole Workflow. Settings → Workflow graphs and the Details panel show the chosen model; when set, every ephemeral Bot in a run uses it instead of the seated Bot's model.
diff --git a/plugins/workflow/client.js b/plugins/workflow/client.js
index 9c22aa64a..7e678c82e 100644
--- a/plugins/workflow/client.js
+++ b/plugins/workflow/client.js
@@ -61,6 +61,7 @@ window.__ModuleLoader__.load({
       Schedule: '定时',
       Model: '模型',
       'Each Bot\'s own model': '跟随各个 Bot 的模型',
+      '{count} models': '{count} 个模型',
       Permissions: '权限',
       'Each Bot\'s own permission': '跟随各个 Bot 的权限',
       'On failure': '失败策略',
@@ -447,7 +448,7 @@ window.__ModuleLoader__.load({
             key, type: 'button', className: tab === key ? 'on' : '', onClick: () => onTab(key),
           }, tr(key === 'flow' ? 'Flow' : key === 'details' ? 'Details' : 'Runs')))),
         tab === 'flow' ? h(Flow, { workflow, run, roster, onTip, editing, onCommit }) : null,
-        tab === 'details' ? h(Details, { workflow }) : null,
+        tab === 'details' ? h(Details, { workflow, roster }) : null,
         tab === 'runs' ? h(Runs, { workflow }) : null,
         h('div', { className: 'wf-ctl' },
           h('button', { type: 'button', className: 'wf-btn', onClick: onReset }, `↺ ${tr('Reset')}`),
@@ -672,14 +673,17 @@ window.__ModuleLoader__.load({
           h('span', { className: 'wf-rl' }, node.role)))
     }
 
-    function Details({ workflow }) {
+    function Details({ workflow, roster }) {
       const trigger = workflow.trigger === 'schedule'
         ? `${tr('Schedule')} · ${workflow.scheduleLabel}`
         : tr('Manual')
       const retries = workflow.nodes.some(node => node.failOnce)
+      const modelLabel = workflow.model
+        ? (roster?.models ?? []).find(m => m.ref === workflow.model)?.name ?? workflow.model
+        : tr('Each Bot\'s own model')
       return h('div', { className: 'wf-box' },
         h('div', { className: 'wf-kv' }, h('span', null, tr('Trigger')), h('span', null, trigger)),
-        h('div', { className: 'wf-kv' }, h('span', null, tr('Model')), h('span', null, tr('Each Bot\'s own model'))),
+        h('div', { className: 'wf-kv' }, h('span', null, tr('Model')), h('span', null, modelLabel)),
         h('div', { className: 'wf-kv' }, h('span', null, tr('Permissions')), h('span', null, tr('Each Bot\'s own permission'))),
         h('div', { className: 'wf-kv' }, h('span', null, tr('On failure')), h('span', null, tr(retries ? 'Tester retries once. Any other failed step stops the run.' : 'A failed step stops the run.'))),
         h('div', { className: 'wf-kv' }, h('span', null, tr('Concurrent runs')), h('span', null, String(workflow.maxConcurrent ?? 2))),
@@ -886,6 +890,21 @@ window.__ModuleLoader__.load({
                 value: current.id,
                 onChange: (event) => { setWorkflowId(event.target.value); setSelectedNode(null) },
               }, workflows.map(item => h('option', { key: item.id, value: item.id }, item.name)))),
+            h('label', { className: 'wf-field' },
+              h('span', null, tr('Model')),
+              h('select', {
+                'aria-label': tr('Model'),
+                value: current.model || '',
+                onChange: (event) => {
+                  const model = event.target.value || null
+                  void Promise.resolve(call('workflow/set-model', { workflowId: current.id, model })).then(value => {
+                    if (value?.ok === false) { setError(value.error ?? ''); return }
+                    if (value?.workflows) setPack(value)
+                  })
+                },
+              },
+                h('option', { value: '' }, tr('Each Bot\'s own model')),
+                (pack?.roster?.models ?? []).map(model => h('option', { key: model.ref, value: model.ref }, `${model.name} (${model.provider})`)))),
             h('button', { type: 'button', className: 'wf-btn', onClick: () => setEditing(!editing) },
               editing ? tr('Finish editing') : tr('Edit')),
             editing ? h('span', { className: 'wf-autosave-hint' }, tr('Changes are saved automatically')) : null),
diff --git a/plugins/workflow/index.js b/plugins/workflow/index.js
index 195046a43..b54436512 100644
--- a/plugins/workflow/index.js
+++ b/plugins/workflow/index.js
@@ -98,6 +98,7 @@ export function apply(ctx, config = {}) {
     fb.api.handle('workflow/delete', body => service.delete(body)),
     fb.api.handle('workflow/assign', body => service.assign(body)),
     fb.api.handle('workflow/concurrency', body => service.setConcurrency(body)),
+    fb.api.handle('workflow/set-model', body => service.setModel(body)),
     fb.api.handle('workflow/advance', body => service.advance(body)),
     fb.api.handle('workflow/reset', body => service.reset(body)),
     fb.api.handle('workflow/pause', body => service.pause(body)),
diff --git a/plugins/workflow/src/ephemeral.js b/plugins/workflow/src/ephemeral.js
index 4a1b7b2cb..d747ef76a 100644
--- a/plugins/workflow/src/ephemeral.js
+++ b/plugins/workflow/src/ephemeral.js
@@ -13,7 +13,7 @@ export function permissionFor(tools) {
   return 'workspace-write'
 }
 
-export function nodeConfig(node, roster = []) {
+export function nodeConfig(node, roster = [], workflowModel = '') {
   const seated = node?.botId
     ? roster.find(bot => bot && bot.id === node.botId && bot.remote !== true)
     : undefined
@@ -25,19 +25,19 @@ export function nodeConfig(node, roster = []) {
     name: node.name,
     role: cleanLine(node.role || seated?.role, 80),
     prompt,
-    model: cleanLine(node.model || seated?.model, 80),
+    model: cleanLine(workflowModel || node.model || seated?.model, 80),
     tools: cleanTools(node.tools),
     hidden: true,
     ephemeral: true,
   }
 }
 
-export async function spawnAll(nodes, roster, spawn) {
+export async function spawnAll(nodes, roster, spawn, workflowModel = '') {
   const made = []
   try {
     const ephemeral = {}
     for (const node of nodes) {
-      const spec = nodeConfig(node, roster)
+      const spec = nodeConfig(node, roster, workflowModel)
       const id = await spawn(spec)
       if (typeof id !== 'string' || id === '') throw new Error('The run could not start a Bot')
       made.push(id)
diff --git a/plugins/workflow/src/service.js b/plugins/workflow/src/service.js
index 52ec6d5f9..656ffa9e4 100644
--- a/plugins/workflow/src/service.js
+++ b/plugins/workflow/src/service.js
@@ -169,6 +169,7 @@ export function createWorkflowService({ dir, persist = true, now = () => Date.no
         description: item.description ?? '',
         trigger: item.trigger ?? 'manual',
         scheduleLabel: item.scheduleLabel ?? '',
+        model: item.model ?? '',
         nodes: item.nodes.map(node => publicNode(node, roster)),
         edges: (item.edges ?? []).map(publicEdge),
         layers: item.layers.map(layer => [...layer]),
@@ -523,7 +524,7 @@ export function createWorkflowService({ dir, persist = true, now = () => Date.no
       const holes = missingProviders(item)
       if (holes.length > 0) return { ok: false, error: `Node ${holes[0].nodeId} input ${holes[0].name} has no upstream provider` }
       try {
-        ephemeral = await spawnAll(item.nodes, bots() ?? [], spawn)
+        ephemeral = await spawnAll(item.nodes, bots() ?? [], spawn, item.model ?? '')
       } catch (error) {
         await releaseAll(error.spawned ?? [], release, warn)
         return refuse(error)
@@ -764,6 +765,16 @@ export function createWorkflowService({ dir, persist = true, now = () => Date.no
         return present()
       })
     },
+    setModel(body = {}) {
+      if (readOnly()) return { ok: false, code: 'read-only', error: 'The host is read-only' }
+      const workflowId = String(body.workflowId ?? '')
+      const model = body.model ? cleanLine(body.model, 80) : null
+      const saved = mutate(workflowId, (item) => {
+        item.model = model
+      })
+      if (saved.ok === false) return saved
+      return present()
+    },
     advance(body = {}) {
       const workflowId = String(body.workflowId ?? '')
       const outcome = body.outcome === 'failed' ? 'fail' : 'complete'
diff --git a/plugins/workflow/test/ephemeral.test.js b/plugins/workflow/test/ephemeral.test.js
index c5413a40f..d6bbeabfb 100644
--- a/plugins/workflow/test/ephemeral.test.js
+++ b/plugins/workflow/test/ephemeral.test.js
@@ -72,6 +72,42 @@ test('define_workflow stores a node prompt, and the graph save edits it', () =>
   assert.equal(edited.workflows.find(item => item.id === made.id).nodes.find(node => node.id === 'code').prompt, 'Keep the diff small.')
 })
 
+test('workflow-level model is passed to all ephemeral Bots when set', async () => {
+  const { svc, spawned } = harness()
+  const made = svc.define({
+    name: 'Workflow with model',
+    nodes: [
+      { id: 'plan', name: 'Planner', role: 'plan', prompt: 'Plan it.' },
+      { id: 'code', name: 'Coder', role: 'code', prompt: 'Code it.', model: 'mock/coder-override' },
+    ],
+    edges: [{ from: 'plan', to: 'code' }],
+  }).workflows.find(item => item.name === 'Workflow with model')
+  
+  const withModel = await svc.setModel({ workflowId: made.id, model: 'mock/workflow-model' })
+  assert.equal(withModel.ok, true)
+  const updated = withModel.workflows.find(item => item.id === made.id)
+  assert.equal(updated.model, 'mock/workflow-model')
+  
+  await svc.runNamed({ workflow: 'Workflow with model', brief: 'Test workflow model' })
+  assert.equal(spawned.length, 2)
+  const planSpec = spawned.find(item => item.spec.nodeId === 'plan').spec
+  const codeSpec = spawned.find(item => item.spec.nodeId === 'code').spec
+  assert.equal(planSpec.model, 'mock/workflow-model')
+  assert.equal(codeSpec.model, 'mock/workflow-model')
+})
+
+test('workflow model is empty by default and uses seated Bot model', async () => {
+  const { svc, spawned } = harness()
+  const made = lane(svc).workflows.find(item => item.name === 'Lane')
+  assert.equal(made.model, '')
+  
+  await svc.runNamed({ workflow: 'Lane', brief: 'Test default' })
+  const planSpec = spawned.find(item => item.spec.nodeId === 'plan').spec
+  assert.equal(planSpec.model, '')
+  const codeSpec = spawned.find(item => item.spec.nodeId === 'code').spec
+  assert.equal(codeSpec.model, 'mock/coder')
+})
+
 test('a run spawns a hidden Bot per node, hands it the step, and removes every one when the run finishes', async () => {
   const { svc, spawned, released, dispatched } = harness()
   const made = lane(svc).workflows.find(item => item.name === 'Lane')