diff --git a/apps/code/src/renderer/features/settings/components/sections/GeneralSettings.tsx b/apps/code/src/renderer/features/settings/components/sections/GeneralSettings.tsx
index c9d35b912..a770d2c85 100644
--- a/apps/code/src/renderer/features/settings/components/sections/GeneralSettings.tsx
+++ b/apps/code/src/renderer/features/settings/components/sections/GeneralSettings.tsx
@@ -1,10 +1,11 @@
 import { useAuthStateValue } from "@features/auth/hooks/authQueries";
 import { SettingRow } from "@features/settings/components/SettingRow";
 import {
-  type AutoConvertLongText,
-  type CompletionSound,
-  type DefaultInitialTaskMode,
-  type DiffOpenMode,
+ type AutoConvertLongText,
+ type CompletionSound,
+ type DefaultInitialTaskMode,
+ type DefaultReasoningEffort,
+ type DiffOpenMode,
   type SendMessagesWith,
   useSettingsStore,
 } from "@features/settings/stores/settingsStore";
@@ -75,19 +76,21 @@ export function GeneralSettings() {
     dockBounceNotifications,
     completionSound,
     completionVolume,
-    autoConvertLongText,
-    defaultInitialTaskMode,
-    diffOpenMode,
-    sendMessagesWith,
-    hedgehogMode,
-    setDesktopNotifications,
-    setDockBadgeNotifications,
-    setDockBounceNotifications,
-    setCompletionSound,
-    setCompletionVolume,
-    setAutoConvertLongText,
-    setDefaultInitialTaskMode,
-    setDiffOpenMode,
+ autoConvertLongText,
+ defaultInitialTaskMode,
+ defaultReasoningEffort,
+ diffOpenMode,
+ sendMessagesWith,
+ hedgehogMode,
+ setDesktopNotifications,
+ setDockBadgeNotifications,
+ setDockBounceNotifications,
+ setCompletionSound,
+ setCompletionVolume,
+ setAutoConvertLongText,
+ setDefaultInitialTaskMode,
+ setDefaultReasoningEffort,
+ setDiffOpenMode,
     setSendMessagesWith,
     setHedgehogMode,
   } = useSettingsStore();
@@ -178,19 +181,31 @@ export function GeneralSettings() {
     [diffOpenMode, setDiffOpenMode],
   );
 
-  const handleDefaultInitialTaskModeChange = useCallback(
-    (value: DefaultInitialTaskMode) => {
-      track(ANALYTICS_EVENTS.SETTING_CHANGED, {
-        setting_name: "default_initial_task_mode",
-        new_value: value,
-        old_value: defaultInitialTaskMode,
-      });
-      setDefaultInitialTaskMode(value);
-    },
-    [defaultInitialTaskMode, setDefaultInitialTaskMode],
-  );
-
-  const handleSendMessagesWithChange = useCallback(
+ const handleDefaultInitialTaskModeChange = useCallback(
+ (value: DefaultInitialTaskMode) => {
+ track(ANALYTICS_EVENTS.SETTING_CHANGED, {
+ setting_name: "default_initial_task_mode",
+ new_value: value,
+ old_value: defaultInitialTaskMode,
+ });
+ setDefaultInitialTaskMode(value);
+ },
+ [defaultInitialTaskMode, setDefaultInitialTaskMode],
+ );
+
+ const handleDefaultReasoningEffortChange = useCallback(
+ (value: DefaultReasoningEffort) => {
+ track(ANALYTICS_EVENTS.SETTING_CHANGED, {
+ setting_name: "default_reasoning_effort",
+ new_value: value,
+ old_value: defaultReasoningEffort,
+ });
+ setDefaultReasoningEffort(value);
+ },
+ [defaultReasoningEffort, setDefaultReasoningEffort],
+ );
+
+ const handleSendMessagesWithChange = useCallback(
     (value: SendMessagesWith) => {
       track(ANALYTICS_EVENTS.SETTING_CHANGED, {
         setting_name: "send_messages_with",
@@ -381,13 +396,36 @@ export function GeneralSettings() {
           <Select.Trigger className="min-w-[100px]" />
           <Select.Content>
             <Select.Item value="plan">Plan</Select.Item>
-            <Select.Item value="last_used">Last used</Select.Item>
-          </Select.Content>
-        </Select.Root>
-      </SettingRow>
-
-      <SettingRow
-        label="Send messages with"
+ <Select.Item value="last_used">Last used</Select.Item>
+ </Select.Content>
+ </Select.Root>
+ </SettingRow>
+
+ <SettingRow
+ label="Default effort level"
+ description="Choose the default reasoning effort for new tasks, or remember your last-used level"
+ >
+ <Select.Root
+ value={defaultReasoningEffort}
+ onValueChange={(value) =>
+ handleDefaultReasoningEffortChange(value as DefaultReasoningEffort)
+ }
+ size="1"
+ >
+ <Select.Trigger className="min-w-[100px]" />
+ <Select.Content>
+ <Select.Item value="last_used">Last used</Select.Item>
+ <Select.Item value="low">Low</Select.Item>
+ <Select.Item value="medium">Medium</Select.Item>
+ <Select.Item value="high">High</Select.Item>
+ <Select.Item value="xhigh">Extra High</Select.Item>
+ <Select.Item value="max">Max</Select.Item>
+ </Select.Content>
+ </Select.Root>
+ </SettingRow>
+
+ <SettingRow
+ label="Send messages with"
         description="Choose which key combination sends messages. Use Shift+Enter for new lines"
       >
         <Select.Root
diff --git a/apps/code/src/renderer/features/settings/stores/settingsStore.ts b/apps/code/src/renderer/features/settings/stores/settingsStore.ts
index 1ea969bf2..c9b99c586 100644
--- a/apps/code/src/renderer/features/settings/stores/settingsStore.ts
+++ b/apps/code/src/renderer/features/settings/stores/settingsStore.ts
@@ -24,6 +24,7 @@ export type CompletionSound =
 export type AgentAdapter = "claude" | "codex";
 export type AutoConvertLongText = "off" | "1000" | "2500" | "5000" | "10000";
 export type DefaultInitialTaskMode = "plan" | "last_used";
+export type DefaultReasoningEffort = "low" | "medium" | "high" | "xhigh" | "max" | "last_used";
 
 export interface HintState {
   count: number;
@@ -53,9 +54,10 @@ interface SettingsStore {
   preventSleepWhileRunning: boolean;
   debugLogsCloudRuns: boolean;
   customInstructions: string;
-  defaultInitialTaskMode: DefaultInitialTaskMode;
-  lastUsedInitialTaskMode: ExecutionMode;
-  diffOpenMode: DiffOpenMode;
+ defaultInitialTaskMode: DefaultInitialTaskMode;
+ lastUsedInitialTaskMode: ExecutionMode;
+ defaultReasoningEffort: DefaultReasoningEffort;
+ diffOpenMode: DiffOpenMode;
   hedgehogMode: boolean;
   mcpAppsDisabledServers: string[];
   hints: Record<string, HintState>;
@@ -89,9 +91,10 @@ interface SettingsStore {
   setPreventSleepWhileRunning: (enabled: boolean) => void;
   setDebugLogsCloudRuns: (enabled: boolean) => void;
   setCustomInstructions: (instructions: string) => void;
-  setDefaultInitialTaskMode: (mode: DefaultInitialTaskMode) => void;
-  setLastUsedInitialTaskMode: (mode: ExecutionMode) => void;
-  setDiffOpenMode: (mode: DiffOpenMode) => void;
+ setDefaultInitialTaskMode: (mode: DefaultInitialTaskMode) => void;
+ setLastUsedInitialTaskMode: (mode: ExecutionMode) => void;
+ setDefaultReasoningEffort: (effort: DefaultReasoningEffort) => void;
+ setDiffOpenMode: (mode: DiffOpenMode) => void;
   setHedgehogMode: (enabled: boolean) => void;
   setMcpAppsDisabledServers: (servers: string[]) => void;
 }
@@ -120,9 +123,10 @@ export const useSettingsStore = create<SettingsStore>()(
       preventSleepWhileRunning: false,
       debugLogsCloudRuns: false,
       customInstructions: "",
-      defaultInitialTaskMode: "plan",
-      lastUsedInitialTaskMode: "plan",
-      diffOpenMode: "auto",
+ defaultInitialTaskMode: "plan",
+ lastUsedInitialTaskMode: "plan",
+ defaultReasoningEffort: "last_used",
+ diffOpenMode: "auto",
       hedgehogMode: false,
       mcpAppsDisabledServers: [],
       hints: {},
@@ -194,11 +198,13 @@ export const useSettingsStore = create<SettingsStore>()(
       setDebugLogsCloudRuns: (enabled) => set({ debugLogsCloudRuns: enabled }),
       setCustomInstructions: (instructions) =>
         set({ customInstructions: instructions }),
-      setDefaultInitialTaskMode: (mode) =>
-        set({ defaultInitialTaskMode: mode }),
-      setLastUsedInitialTaskMode: (mode) =>
-        set({ lastUsedInitialTaskMode: mode }),
-      setDiffOpenMode: (mode) => set({ diffOpenMode: mode }),
+ setDefaultInitialTaskMode: (mode) =>
+ set({ defaultInitialTaskMode: mode }),
+ setLastUsedInitialTaskMode: (mode) =>
+ set({ lastUsedInitialTaskMode: mode }),
+ setDefaultReasoningEffort: (effort) =>
+ set({ defaultReasoningEffort: effort }),
+ setDiffOpenMode: (mode) => set({ diffOpenMode: mode }),
       setHedgehogMode: (enabled) => set({ hedgehogMode: enabled }),
       setMcpAppsDisabledServers: (servers) =>
         set({ mcpAppsDisabledServers: servers }),
@@ -228,9 +234,10 @@ export const useSettingsStore = create<SettingsStore>()(
         preventSleepWhileRunning: state.preventSleepWhileRunning,
         debugLogsCloudRuns: state.debugLogsCloudRuns,
         customInstructions: state.customInstructions,
-        defaultInitialTaskMode: state.defaultInitialTaskMode,
-        lastUsedInitialTaskMode: state.lastUsedInitialTaskMode,
-        diffOpenMode: state.diffOpenMode,
+ defaultInitialTaskMode: state.defaultInitialTaskMode,
+ lastUsedInitialTaskMode: state.lastUsedInitialTaskMode,
+ defaultReasoningEffort: state.defaultReasoningEffort,
+ diffOpenMode: state.diffOpenMode,
         hedgehogMode: state.hedgehogMode,
         hints: state.hints,
         mcpAppsDisabledServers: state.mcpAppsDisabledServers,
diff --git a/apps/code/src/renderer/features/task-detail/hooks/usePreviewConfig.ts b/apps/code/src/renderer/features/task-detail/hooks/usePreviewConfig.ts
index 02a0aa2d0..3a291e0af 100644
--- a/apps/code/src/renderer/features/task-detail/hooks/usePreviewConfig.ts
+++ b/apps/code/src/renderer/features/task-detail/hooks/usePreviewConfig.ts
@@ -67,11 +67,12 @@ export function usePreviewConfig(
       .then((options) => {
         if (abort.signal.aborted) return;
 
-        const {
-          defaultInitialTaskMode,
-          lastUsedInitialTaskMode,
-          lastUsedReasoningEffort,
-        } = useSettingsStore.getState();
+ const {
+ defaultInitialTaskMode,
+ lastUsedInitialTaskMode,
+ defaultReasoningEffort,
+ lastUsedReasoningEffort,
+ } = useSettingsStore.getState();
 
         // Use the mode option's existing currentValue (set by the server
         // based on the adapter) when the user hasn't chosen a preference,
@@ -111,27 +112,40 @@ export function usePreviewConfig(
             : opt,
         );
 
-        const withEffort = withMode.map((opt) => {
-          if (opt.category !== "thought_level" || opt.type !== "select") {
-            return opt;
-          }
-          const validValues = flattenValues(
-            opt.options as Array<{
-              value?: string;
-              options?: Array<{ value: string }>;
-            }>,
-          );
-          if (
-            lastUsedReasoningEffort &&
-            validValues.includes(lastUsedReasoningEffort)
-          ) {
-            return {
-              ...opt,
-              currentValue: lastUsedReasoningEffort,
-            } as SessionConfigOption;
-          }
-          return opt;
-        });
+ const withEffort = withMode.map((opt) => {
+ if (opt.category !== "thought_level" || opt.type !== "select") {
+ return opt;
+ }
+ const validValues = flattenValues(
+ opt.options as Array<{
+ value?: string;
+ options?: Array<{ value: string }>;
+ }>,
+ );
+ // Mirror the defaultInitialTaskMode pattern: if defaultReasoningEffort
+ // is "last_used" and we have a valid last-used value, use it;
+ // otherwise, use the explicit default the user configured.
+ if (defaultReasoningEffort === "last_used") {
+ if (
+ lastUsedReasoningEffort &&
+ validValues.includes(lastUsedReasoningEffort)
+ ) {
+ return {
+ ...opt,
+ currentValue: lastUsedReasoningEffort,
+ } as SessionConfigOption;
+ }
+ return opt;
+ }
+ // User chose a fixed default — use it if valid for this model
+ if (validValues.includes(defaultReasoningEffort)) {
+ return {
+ ...opt,
+ currentValue: defaultReasoningEffort,
+ } as SessionConfigOption;
+ }
+ return opt;
+ });
 
         setConfigOptions(withEffort);
         setIsLoading(false);
@@ -168,26 +182,33 @@ export function usePreviewConfig(
                 ? "reasoning_effort"
                 : "effort";
 
-          const { lastUsedReasoningEffort } = useSettingsStore.getState();
-          const isValidEffort = (effort: unknown): effort is string =>
-            typeof effort === "string" &&
-            !!effortOpts?.some((e) => e.value === effort);
-          if (effortOpts && existingIdx >= 0) {
-            const currentEffort = updated[existingIdx].currentValue;
-            const nextEffort = isValidEffort(currentEffort)
-              ? currentEffort
-              : isValidEffort(lastUsedReasoningEffort)
-                ? lastUsedReasoningEffort
-                : "high";
+ const { lastUsedReasoningEffort, defaultReasoningEffort } =
+ useSettingsStore.getState();
+ const isValidEffort = (effort: unknown): effort is string =>
+ typeof effort === "string" &&
+ !!effortOpts?.some((e) => e.value === effort);
+ const resolveEffortFallback = (): string => {
+ if (defaultReasoningEffort !== "last_used") {
+ return isValidEffort(defaultReasoningEffort)
+ ? defaultReasoningEffort
+ : "high";
+ }
+ return isValidEffort(lastUsedReasoningEffort)
+ ? lastUsedReasoningEffort
+ : "high";
+ };
+ if (effortOpts && existingIdx >= 0) {
+ const currentEffort = updated[existingIdx].currentValue;
+ const nextEffort = isValidEffort(currentEffort)
+ ? currentEffort
+ : resolveEffortFallback();
             updated[existingIdx] = {
               ...updated[existingIdx],
               currentValue: nextEffort,
               options: effortOpts,
             } as SessionConfigOption;
-          } else if (effortOpts && existingIdx === -1) {
-            const nextEffort = isValidEffort(lastUsedReasoningEffort)
-              ? lastUsedReasoningEffort
-              : "high";
+ } else if (effortOpts && existingIdx === -1) {
+ const nextEffort = resolveEffortFallback();
             updated = [
               ...updated,
               {