diff --git a/cmd/gateway.go b/cmd/gateway.go
index de05d55f..b7c4ffbf 100644
--- a/cmd/gateway.go
+++ b/cmd/gateway.go
@@ -728,6 +728,7 @@ func runGateway() {
 	heartbeatTool.SetWakeFn(heartbeatTicker.Wake)
 	heartbeatMethods.SetWakeFn(heartbeatTicker.Wake)
 	heartbeatMethods.SetAgentStore(pgStores.Agents)
+	heartbeatMethods.SetProviderStore(pgStores.Providers)
 	cronHeartbeatWakeFn = func(agentID string) {
 		if id, err := uuid.Parse(agentID); err == nil {
 			heartbeatTicker.Wake(id)
diff --git a/internal/agent/loop.go b/internal/agent/loop.go
index 5fdbd56a..980e34ce 100644
--- a/internal/agent/loop.go
+++ b/internal/agent/loop.go
@@ -618,10 +618,16 @@ func (l *Loop) runLoop(ctx context.Context, req RunRequest) (*RunResult, error)
 			toolDefs = filtered
 		}
 
+		// Use per-request model override if set (e.g. heartbeat uses cheaper model).
+		model := l.model
+		if req.ModelOverride != "" {
+			model = req.ModelOverride
+		}
+
 		chatReq := providers.ChatRequest{
 			Messages: messages,
 			Tools:    toolDefs,
-			Model:    l.model,
+			Model:    model,
 			Options: map[string]any{
 				providers.OptMaxTokens:   l.effectiveMaxTokens(),
 				providers.OptTemperature: 0.7,
diff --git a/internal/agent/loop_types.go b/internal/agent/loop_types.go
index 8a587a26..3e11588c 100644
--- a/internal/agent/loop_types.go
+++ b/internal/agent/loop_types.go
@@ -370,6 +370,7 @@ type RunRequest struct {
 	TraceName         string          // override trace name (default: "chat <agentID>")
 	TraceTags         []string        // additional tags for the trace (e.g. "cron")
 	MaxIterations     int             // per-request override (0 = use agent default, must be lower)
+	ModelOverride     string          // per-request model override (heartbeat uses cheaper model)
 	LightContext      bool            // skip loading context files (only inject ExtraSystemPrompt)
 
 	// Run classification
diff --git a/internal/gateway/methods/heartbeat.go b/internal/gateway/methods/heartbeat.go
index b677b5ea..3f828ddd 100644
--- a/internal/gateway/methods/heartbeat.go
+++ b/internal/gateway/methods/heartbeat.go
@@ -19,10 +19,11 @@ import (
 
 // HeartbeatMethods handles heartbeat.get/set/toggle/test/logs/checklist RPC methods.
 type HeartbeatMethods struct {
-	hbStore    store.HeartbeatStore
-	agentStore store.AgentStore
-	eventBus   bus.EventPublisher
-	wakeFn     func(uuid.UUID) // triggers immediate heartbeat run
+	hbStore       store.HeartbeatStore
+	agentStore    store.AgentStore
+	providerStore store.ProviderStore
+	eventBus      bus.EventPublisher
+	wakeFn        func(uuid.UUID) // triggers immediate heartbeat run
 }
 
 func NewHeartbeatMethods(hb store.HeartbeatStore, eventBus bus.EventPublisher) *HeartbeatMethods {
@@ -34,6 +35,11 @@ func (m *HeartbeatMethods) SetAgentStore(as store.AgentStore) {
 	m.agentStore = as
 }
 
+// SetProviderStore sets the provider store for resolving provider names to UUIDs.
+func (m *HeartbeatMethods) SetProviderStore(ps store.ProviderStore) {
+	m.providerStore = ps
+}
+
 // SetWakeFn sets the function called when "heartbeat.test" triggers an immediate run.
 func (m *HeartbeatMethods) SetWakeFn(fn func(uuid.UUID)) {
 	m.wakeFn = fn
@@ -89,6 +95,7 @@ func (m *HeartbeatMethods) handleSet(ctx context.Context, client *gateway.Client
 		Enabled         *bool   `json:"enabled"`
 		IntervalSec     *int    `json:"intervalSec"`
 		Prompt          *string `json:"prompt"`
+		ProviderName    *string `json:"providerName"`
 		Model           *string `json:"model"`
 		IsolatedSession *bool   `json:"isolatedSession"`
 		LightContext    *bool   `json:"lightContext"`
@@ -143,8 +150,24 @@ func (m *HeartbeatMethods) handleSet(ctx context.Context, client *gateway.Client
 	if params.Prompt != nil {
 		hb.Prompt = params.Prompt
 	}
+	if params.ProviderName != nil {
+		if *params.ProviderName == "" {
+			hb.ProviderID = nil // clear override
+		} else if m.providerStore != nil {
+			prov, err := m.providerStore.GetProviderByName(ctx, *params.ProviderName)
+			if err != nil {
+				client.SendResponse(protocol.NewErrorResponse(req.ID, protocol.ErrInvalidRequest, "provider not found: "+*params.ProviderName))
+				return
+			}
+			hb.ProviderID = &prov.ID
+		}
+	}
 	if params.Model != nil {
-		hb.Model = params.Model
+		if *params.Model == "" {
+			hb.Model = nil // clear override
+		} else {
+			hb.Model = params.Model
+		}
 	}
 	if params.IsolatedSession != nil {
 		hb.IsolatedSession = *params.IsolatedSession
diff --git a/internal/heartbeat/ticker.go b/internal/heartbeat/ticker.go
index 66d3277e..f79c65bd 100644
--- a/internal/heartbeat/ticker.go
+++ b/internal/heartbeat/ticker.go
@@ -220,6 +220,12 @@ func (t *Ticker) runOne(ctx context.Context, hb store.AgentHeartbeat) {
 	var result *agent.RunResult
 	maxAttempts := hb.MaxRetries + 1
 
+	// Model override: use heartbeat-specific model if configured.
+	var modelOverride string
+	if hb.Model != nil && *hb.Model != "" {
+		modelOverride = *hb.Model
+	}
+
 	for attempt := range maxAttempts {
 		outCh := t.runAgent(ctx, agent.RunRequest{
 			SessionKey:        sessionKey,
@@ -229,6 +235,7 @@ func (t *Ticker) runOne(ctx context.Context, hb store.AgentHeartbeat) {
 			RunID:             fmt.Sprintf("heartbeat:%s", agentIDStr),
 			Stream:            false,
 			ExtraSystemPrompt: extraSystem,
+			ModelOverride:     modelOverride,
 			LightContext:      hb.LightContext,
 			TraceName:         fmt.Sprintf("Heartbeat [%s]", agentKey),
 			TraceTags:         []string{"heartbeat"},
diff --git a/internal/store/pg/heartbeat.go b/internal/store/pg/heartbeat.go
index cc20c18d..7386260d 100644
--- a/internal/store/pg/heartbeat.go
+++ b/internal/store/pg/heartbeat.go
@@ -199,6 +199,9 @@ func (s *PGHeartbeatStore) UpdateState(ctx context.Context, id uuid.UUID, state
 		id, state.NextRunAt, state.LastRunAt, state.LastStatus, state.LastError,
 		state.RunCount, state.SuppressCount,
 	)
+	if err == nil {
+		s.InvalidateCache() // ensure ListDue picks up new next_run_at immediately
+	}
 	return err
 }
 
diff --git a/ui/web/src/i18n/locales/en/agents.json b/ui/web/src/i18n/locales/en/agents.json
index 4e52b218..f05921d1 100644
--- a/ui/web/src/i18n/locales/en/agents.json
+++ b/ui/web/src/i18n/locales/en/agents.json
@@ -438,6 +438,8 @@
     "activeHoursStart": "Active From (HH:MM)",
     "activeHoursEnd": "Active Until (HH:MM)",
     "timezone": "Timezone",
+    "sectionModel": "Model",
+    "modelHint": "Override provider/model for heartbeat runs. Leave empty to use agent defaults.",
     "sectionDelivery": "Delivery",
     "channel": "Channel",
     "channelPlaceholder": "Select channel",
diff --git a/ui/web/src/i18n/locales/vi/agents.json b/ui/web/src/i18n/locales/vi/agents.json
index 6d9a1cf6..27af4c68 100644
--- a/ui/web/src/i18n/locales/vi/agents.json
+++ b/ui/web/src/i18n/locales/vi/agents.json
@@ -438,6 +438,8 @@
     "activeHoursStart": "Bắt đầu (HH:MM)",
     "activeHoursEnd": "Kết thúc (HH:MM)",
     "timezone": "Múi giờ",
+    "sectionModel": "Model",
+    "modelHint": "Ghi đè provider/model cho heartbeat. Để trống để dùng mặc định của agent.",
     "sectionDelivery": "Gửi kết quả",
     "channel": "Kênh",
     "channelPlaceholder": "Chọn kênh",
diff --git a/ui/web/src/i18n/locales/zh/agents.json b/ui/web/src/i18n/locales/zh/agents.json
index b25335f6..ff99b235 100644
--- a/ui/web/src/i18n/locales/zh/agents.json
+++ b/ui/web/src/i18n/locales/zh/agents.json
@@ -438,6 +438,8 @@
     "activeHoursStart": "开始时间（HH:MM）",
     "activeHoursEnd": "结束时间（HH:MM）",
     "timezone": "时区",
+    "sectionModel": "模型",
+    "modelHint": "覆盖心跳运行的提供者/模型。留空使用代理默认值。",
     "sectionDelivery": "推送设置",
     "channel": "渠道",
     "channelPlaceholder": "选择渠道",
diff --git a/ui/web/src/pages/agents/agent-detail/agent-detail-page.tsx b/ui/web/src/pages/agents/agent-detail/agent-detail-page.tsx
index 5b2f6dfb..b41ebf84 100644
--- a/ui/web/src/pages/agents/agent-detail/agent-detail-page.tsx
+++ b/ui/web/src/pages/agents/agent-detail/agent-detail-page.tsx
@@ -128,6 +128,8 @@ export function AgentDetailPage({ agentId, onBack }: AgentDetailPageProps) {
           setChecklist={hb.setChecklist}
           fetchTargets={hb.fetchTargets}
           refresh={hb.refresh}
+          agentProvider={agent?.provider}
+          agentModel={agent?.model}
         />
       )}
 
diff --git a/ui/web/src/pages/agents/agent-detail/heartbeat-config-dialog.tsx b/ui/web/src/pages/agents/agent-detail/heartbeat-config-dialog.tsx
index 45bb2ccf..5756f723 100644
--- a/ui/web/src/pages/agents/agent-detail/heartbeat-config-dialog.tsx
+++ b/ui/web/src/pages/agents/agent-detail/heartbeat-config-dialog.tsx
@@ -1,5 +1,5 @@
-import { useState, useEffect, useCallback } from "react";
-import { Play, Loader2, ChevronDown, Heart, Clock, Send, FileText } from "lucide-react";
+import { useState, useEffect, useCallback, useMemo } from "react";
+import { Play, Loader2, ChevronDown, Heart, Clock, Send, FileText, Cpu } from "lucide-react";
 import { useTranslation } from "react-i18next";
 import {
   Dialog, DialogContent, DialogHeader, DialogTitle,
@@ -15,7 +15,9 @@ import {
 } from "@/components/ui/select";
 import { useMinLoading } from "@/hooks/use-min-loading";
 import { useChannels } from "@/pages/channels/hooks/use-channels";
+import { useProviders } from "@/pages/providers/hooks/use-providers";
 import { useUiStore } from "@/stores/use-ui-store";
+import { ProviderModelSelect } from "@/components/shared/provider-model-select";
 import type { HeartbeatConfig, DeliveryTarget } from "@/pages/agents/hooks/use-agent-heartbeat";
 
 interface HeartbeatConfigDialogProps {
@@ -23,19 +25,25 @@ interface HeartbeatConfigDialogProps {
   onOpenChange: (open: boolean) => void;
   config: HeartbeatConfig | null;
   saving: boolean;
-  update: (params: Partial<HeartbeatConfig>) => Promise<void>;
+  update: (params: Partial<HeartbeatConfig> & { providerName?: string }) => Promise<void>;
   test: () => Promise<void>;
   getChecklist: () => Promise<string>;
   setChecklist: (content: string) => Promise<void>;
   fetchTargets: () => Promise<DeliveryTarget[]>;
   refresh: () => Promise<void>;
+  /** Agent's current provider name (used as default for heartbeat). */
+  agentProvider?: string;
+  /** Agent's current model (used as default for heartbeat). */
+  agentModel?: string;
 }
 
 export function HeartbeatConfigDialog({
   open, onOpenChange, config, saving, update, test, getChecklist, setChecklist, fetchTargets, refresh,
+  agentProvider, agentModel,
 }: HeartbeatConfigDialogProps) {
   const { t } = useTranslation("agents");
   const { channels: availableChannels } = useChannels();
+  const { providers } = useProviders();
   const channelNames = Object.keys(availableChannels);
   const userTz = useUiStore((s) => s.timezone);
   const browserTz = Intl.DateTimeFormat().resolvedOptions().timeZone;
@@ -53,6 +61,8 @@ export function HeartbeatConfigDialog({
   const [timezone, setTimezone] = useState("");
   const [channel, setChannel] = useState("");
   const [chatId, setChatId] = useState("");
+  const [hbProvider, setHbProvider] = useState("");
+  const [hbModel, setHbModel] = useState("");
   const [checklist, setChecklistState] = useState("");
   const [originalChecklist, setOriginalChecklist] = useState("");
   const [checklistLoading, setChecklistLoading] = useState(false);
@@ -73,6 +83,13 @@ export function HeartbeatConfigDialog({
     }
   }, [getChecklist]);
 
+  // Map providerId UUID → provider name for the select component.
+  const providerNameById = useMemo(() => {
+    const map: Record<string, string> = {};
+    for (const p of providers) map[p.id] = p.name;
+    return map;
+  }, [providers]);
+
   // Sync form state only when dialog opens (false→true).
   useEffect(() => {
     if (!open) return;
@@ -88,9 +105,14 @@ export function HeartbeatConfigDialog({
       setTimezone(config.timezone || defaultTz);
       setChannel(config.channel ?? "");
       setChatId(config.chatId ?? "");
+      // Map stored providerId UUID → name for the select
+      setHbProvider(config.providerId ? (providerNameById[config.providerId] ?? "") : "");
+      setHbModel(config.model ?? "");
     } else {
       // First-time setup defaults
       setTimezone(defaultTz);
+      setHbProvider("");
+      setHbModel("");
     }
     setShowAdvanced(false);
     loadChecklist();
@@ -117,6 +139,8 @@ export function HeartbeatConfigDialog({
       timezone: timezone || undefined,
       channel: channel || undefined,
       chatId: chatId || undefined,
+      model: hbModel || undefined,
+      providerName: hbProvider || undefined,
     });
     if (checklist !== originalChecklist) {
       await setChecklist(checklist);
@@ -164,6 +188,27 @@ export function HeartbeatConfigDialog({
             </div>
           </div>
 
+          {/* ── Provider / Model override ── */}
+          <div className="space-y-2">
+            <div className="flex items-center gap-2">
+              <Cpu className="h-3.5 w-3.5 text-violet-500" />
+              <h4 className="text-xs font-semibold uppercase tracking-wide text-muted-foreground">
+                {t("heartbeat.sectionModel")}
+              </h4>
+            </div>
+            <p className="text-xs text-muted-foreground">{t("heartbeat.modelHint")}</p>
+            <ProviderModelSelect
+              provider={hbProvider}
+              onProviderChange={setHbProvider}
+              model={hbModel}
+              onModelChange={setHbModel}
+              allowEmpty
+              showVerify={!!(hbProvider && hbModel)}
+              providerPlaceholder={agentProvider ? `(${agentProvider})` : "(agent default)"}
+              modelPlaceholder={agentModel ? `(${agentModel})` : "(agent default)"}
+            />
+          </div>
+
           {/* ── Delivery — WHERE it sends ── */}
           <div className="space-y-2">
             <div className="flex items-center gap-2">
diff --git a/ui/web/src/pages/agents/hooks/use-agent-heartbeat.ts b/ui/web/src/pages/agents/hooks/use-agent-heartbeat.ts
index d66f2583..497d0e99 100644
--- a/ui/web/src/pages/agents/hooks/use-agent-heartbeat.ts
+++ b/ui/web/src/pages/agents/hooks/use-agent-heartbeat.ts
@@ -11,6 +11,8 @@ export interface HeartbeatConfig {
   intervalSec: number;
   ackMaxChars: number;
   maxRetries: number;
+  providerId?: string;
+  model?: string;
   isolatedSession: boolean;
   lightContext: boolean;
   activeHoursStart?: string;