diff --git a/app/javascript/dashboard/components-next/captain/pageComponents/overview/RangeSelector.vue b/app/javascript/dashboard/components-next/captain/pageComponents/overview/RangeSelector.vue
new file mode 100644
index 000000000..77a9b6d05
--- /dev/null
+++ b/app/javascript/dashboard/components-next/captain/pageComponents/overview/RangeSelector.vue
@@ -0,0 +1,79 @@
+<script setup>
+import { computed } from 'vue';
+import { useToggle } from '@vueuse/core';
+import { useI18n } from 'vue-i18n';
+import { vOnClickOutside } from '@vueuse/components';
+import Button from 'dashboard/components-next/button/Button.vue';
+import DropdownMenu from 'dashboard/components-next/dropdown-menu/DropdownMenu.vue';
+
+const modelValue = defineModel({ type: String, default: '30' });
+
+const { t } = useI18n();
+const [showDropdown, toggleDropdown] = useToggle();
+
+const DAY_RANGES = ['7', '30', '90'];
+
+const decorate = item => ({
+  ...item,
+  action: 'select',
+  isSelected: item.value === modelValue.value,
+});
+
+const menuSections = computed(() => {
+  const dayItems = DAY_RANGES.map(value =>
+    decorate({
+      value,
+      label: t('CAPTAIN.OVERVIEW.RANGES.LAST_DAYS', { count: value }),
+    })
+  );
+  const monthItems = [
+    decorate({
+      value: 'this_month',
+      label: t('CAPTAIN.OVERVIEW.RANGES.THIS_MONTH'),
+    }),
+    decorate({
+      value: 'last_month',
+      label: t('CAPTAIN.OVERVIEW.RANGES.LAST_MONTH'),
+    }),
+  ];
+  return [{ items: dayItems }, { items: monthItems }];
+});
+
+const menuItems = computed(() =>
+  menuSections.value.flatMap(section => section.items)
+);
+
+const selectedLabel = computed(
+  () => menuItems.value.find(item => item.isSelected)?.label || ''
+);
+
+const handleAction = ({ value }) => {
+  toggleDropdown(false);
+  modelValue.value = value;
+};
+</script>
+
+<template>
+  <div
+    v-on-click-outside="() => toggleDropdown(false)"
+    class="relative flex items-center group"
+  >
+    <Button
+      sm
+      slate
+      faded
+      trailing-icon
+      icon="i-lucide-chevron-down"
+      :label="selectedLabel"
+      class="rounded-md group-hover:bg-n-alpha-2"
+      @click="toggleDropdown()"
+    />
+    <DropdownMenu
+      v-if="showDropdown"
+      :menu-items="menuItems"
+      :menu-sections="menuSections"
+      class="mt-1 ltr:right-0 rtl:left-0 top-full"
+      @action="handleAction($event)"
+    />
+  </div>
+</template>
diff --git a/app/javascript/dashboard/i18n/locale/en/integrations.json b/app/javascript/dashboard/i18n/locale/en/integrations.json
index ed7f029f7..e8cb56423 100644
--- a/app/javascript/dashboard/i18n/locale/en/integrations.json
+++ b/app/javascript/dashboard/i18n/locale/en/integrations.json
@@ -404,7 +404,9 @@
         "DISMISS": "Dismiss"
       },
       "RANGES": {
-        "DAYS": "{count}d"
+        "LAST_DAYS": "Last {count} days",
+        "THIS_MONTH": "This month",
+        "LAST_MONTH": "Last month"
       },
       "METRICS": {
         "HANDLED": {
diff --git a/app/javascript/dashboard/routes/dashboard/captain/assistants/overview/Index.vue b/app/javascript/dashboard/routes/dashboard/captain/assistants/overview/Index.vue
index b25722648..31300c9a4 100644
--- a/app/javascript/dashboard/routes/dashboard/captain/assistants/overview/Index.vue
+++ b/app/javascript/dashboard/routes/dashboard/captain/assistants/overview/Index.vue
@@ -6,6 +6,7 @@ import { FEATURE_FLAGS } from 'dashboard/featureFlags';
 import CaptainAssistant from 'dashboard/api/captain/assistant';
 
 import PageLayout from 'dashboard/components-next/captain/PageLayout.vue';
+import RangeSelector from 'dashboard/components-next/captain/pageComponents/overview/RangeSelector.vue';
 import WelcomeCard from 'dashboard/components-next/captain/pageComponents/overview/WelcomeCard.vue';
 import MetricCard from 'dashboard/components-next/captain/pageComponents/overview/MetricCard.vue';
 import KnowledgeCard from 'dashboard/components-next/captain/pageComponents/overview/KnowledgeCard.vue';
@@ -17,8 +18,7 @@ import InboxBanner from 'dashboard/components-next/captain/pageComponents/overvi
 const { t } = useI18n();
 const route = useRoute();
 
-const ranges = ['7', '30', '90'];
-const selectedRange = ref('30');
+const selectedRange = ref('this_month');
 
 const assistantId = computed(() => route.params.assistantId);
 const stats = ref(null);
@@ -105,22 +105,7 @@ const metrics = computed(() => [
     :feature-flag="FEATURE_FLAGS.CAPTAIN"
   >
     <template #headerActions>
-      <div class="flex items-center gap-1 p-1 rounded-lg bg-n-alpha-1 shrink-0">
-        <button
-          v-for="range in ranges"
-          :key="range"
-          type="button"
-          class="px-3 py-1 text-sm font-medium rounded-md transition-colors"
-          :class="
-            selectedRange === range
-              ? 'bg-n-solid-active text-n-slate-12 shadow-sm'
-              : 'text-n-slate-11 hover:text-n-slate-12'
-          "
-          @click="selectedRange = range"
-        >
-          {{ $t('CAPTAIN.OVERVIEW.RANGES.DAYS', { count: range }) }}
-        </button>
-      </div>
+      <RangeSelector v-model="selectedRange" />
     </template>
     <template #body>
       <div class="flex flex-col gap-6">
@@ -147,7 +132,7 @@ const metrics = computed(() => [
           <ResponseQualityCard />
         </div>
 
-        <CreditUsageCard :range="selectedRange" />
+        <CreditUsageCard />
 
         <QuickLinks />
       </div>
diff --git a/enterprise/app/builders/captain/assistant_stats_builder.rb b/enterprise/app/builders/captain/assistant_stats_builder.rb
index af5ca9154..dfbf74486 100644
--- a/enterprise/app/builders/captain/assistant_stats_builder.rb
+++ b/enterprise/app/builders/captain/assistant_stats_builder.rb
@@ -5,14 +5,17 @@
 class Captain::AssistantStatsBuilder
   RESOLVED_EVENT_NAMES = %w[conversation_captain_inference_resolved conversation_bot_resolved].freeze
   HANDOFF_EVENT_NAMES = %w[conversation_captain_inference_handoff conversation_bot_handoff].freeze
-  DEFAULT_RANGE_DAYS = 30
+  DEFAULT_RANGE = '30'.freeze
 
-  attr_reader :assistant, :account, :range_days
+  attr_reader :assistant, :account, :range
 
-  def initialize(assistant, range_days = DEFAULT_RANGE_DAYS)
+  # `range` is either a day count ('7', '30', '90') or a named period
+  # ('this_month', 'last_month'). The previous window mirrors the current one:
+  # the preceding N days for day ranges, or the preceding month for month ranges.
+  def initialize(assistant, range = DEFAULT_RANGE)
     @assistant = assistant
     @account = assistant.account
-    @range_days = range_days.to_i.positive? ? range_days.to_i : DEFAULT_RANGE_DAYS
+    @range = range.presence || DEFAULT_RANGE
   end
 
   def metrics
@@ -33,11 +36,37 @@ class Captain::AssistantStatsBuilder
   private
 
   def current_range
-    @current_range ||= (range_days.days.ago)..Time.current
+    resolved_ranges[:current]
   end
 
   def previous_range
-    @previous_range ||= ((2 * range_days).days.ago)..range_days.days.ago
+    resolved_ranges[:previous]
+  end
+
+  def resolved_ranges
+    @resolved_ranges ||= case range.to_s
+                         when 'this_month' then this_month_ranges
+                         when 'last_month' then last_month_ranges
+                         else day_ranges
+                         end
+  end
+
+  def this_month_ranges
+    start = Time.current.beginning_of_month
+    elapsed = Time.current - start
+    previous_start = start - 1.month
+    { current: start..Time.current, previous: previous_start..(previous_start + elapsed) }
+  end
+
+  def last_month_ranges
+    start = 1.month.ago.beginning_of_month
+    previous_start = start - 1.month
+    { current: start..start.end_of_month, previous: previous_start..previous_start.end_of_month }
+  end
+
+  def day_ranges
+    days = range.to_i.positive? ? range.to_i : 30
+    { current: days.days.ago..Time.current, previous: (2 * days).days.ago..days.days.ago }
   end
 
   # Raw metric values for a single window.