diff --git a/Dockerfile b/Dockerfile
index bee215efbe9b..2573d0924ce9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@
 # ---------------------------------------------------------------
 # To update the sha:
 # https://github.com/github/gh-base-image/pkgs/container/gh-base-image%2Fgh-base-noble
-FROM ghcr.io/github/gh-base-image/gh-base-noble:20251114-221740-gd084d271e AS base
+FROM ghcr.io/github/gh-base-image/gh-base-noble:20251119-090131-gb27dc275c AS base
 
 # Install curl for Node install and determining the early access branch
 # Install git for cloning docs-early-access & translations repos
diff --git a/content/admin/enforcing-policies/enforcing-policy-with-pre-receive-hooks/about-pre-receive-hooks.md b/content/admin/enforcing-policies/enforcing-policy-with-pre-receive-hooks/about-pre-receive-hooks.md
index 505f2dc300aa..98ccf11b8b1a 100644
--- a/content/admin/enforcing-policies/enforcing-policy-with-pre-receive-hooks/about-pre-receive-hooks.md
+++ b/content/admin/enforcing-policies/enforcing-policy-with-pre-receive-hooks/about-pre-receive-hooks.md
@@ -44,6 +44,26 @@ Due to risk of failure and performance impact for all users of your instance, we
 > [!NOTE]
 > To avoid rejection of a push due to a timeout, all combined pre-receive hooks should run in under five seconds.
 
+## Pre-receive hook timeouts
+
+Pre-receive hooks in {% data variables.product.prodname_ghe_server %} have a fixed timeout budget of 5 seconds (shared across all hooks). This is intentional design to prevent resource exhaustion from long-running hooks and to prevent runaway scripts from blocking repository operations indefinitely.
+
+All pre-receive hooks for a repository share a **cumulative timeout budget**:
+- If hook A takes 3 seconds, hook B gets 2 seconds remaining (from 5 second default)
+- If hook A times out at 5 seconds, hook B never executes
+
+> [!IMPORTANT]
+> Pre-receive hook timeouts are handled differently from exit codes:
+> - **Exit codes**: Enforcement configuration is honored (non-enforced hooks don't block pushes)
+> - **Timeouts**: Push may fail regardless of enforcement configuration
+
+### Timeout behavior
+
+Scenario | Enforcement = Enabled | Enforcement = Disabled/Testing
+----------|----------------------|--------------------------------
+Exit code ≠ 0 | Push rejected | Push continues (warning only)
+Timeout exceeded | Push rejected | Warning + push may still fail
+
 {% ifversion ghes > 3.16 %}
 
 {% data reusables.repositories.push-rule-and-prereceive-hooks %}
diff --git a/content/billing/concepts/cost-centers.md b/content/billing/concepts/cost-centers.md
index 034ce454799b..894eac856c2e 100644
--- a/content/billing/concepts/cost-centers.md
+++ b/content/billing/concepts/cost-centers.md
@@ -35,3 +35,4 @@ For more details, see [AUTOTITLE](/billing/reference/cost-center-allocation).
 * The maximum number of resources per cost center is 10,000.
 * A maximum of 50 resources can be added to or removed from a cost center at a time.
 * Azure subscriptions can only be added to or removed from cost centers through the UI.
+* Outside collaborators can only be added to cost centers via the cost center API. For more information, see [AUTOTITLE](/billing/tutorials/control-costs-at-scale#add-resources-to-the-cost-center).
diff --git a/content/copilot/reference/ai-models/model-hosting.md b/content/copilot/reference/ai-models/model-hosting.md
index 2aa0dfbc9845..498e0558fa97 100644
--- a/content/copilot/reference/ai-models/model-hosting.md
+++ b/content/copilot/reference/ai-models/model-hosting.md
@@ -46,11 +46,20 @@ Used for:
 
 ## Anthropic models
 
+<!-- expires 2025-12-05 -->
+
+<!-- When this expires, check with the stakeholder for release #20458 on whether or not this note can be removed -->
+
+{% data reusables.copilot.claude-promo-period %} See [Model multipliers](/copilot/reference/ai-models/supported-models#model-multipliers).
+
+<!-- end expires 2025-12-05 -->
+
 Used for:
 
 * {% data variables.copilot.copilot_claude_haiku_45 %}
 * {% data variables.copilot.copilot_claude_sonnet_45 %}
 * {% data variables.copilot.copilot_claude_opus_41 %}
+* {% data variables.copilot.copilot_claude_opus_45 %}
 * {% data variables.copilot.copilot_claude_sonnet_40 %}
 
 These models are hosted by Amazon Web Services, Anthropic PBC, and Google Cloud Platform. {% data variables.product.github %} has provider agreements in place to ensure data is not used for training. Additional details for each provider are included below:
@@ -80,8 +89,6 @@ When using {% data variables.copilot.copilot_gemini %} models, input prompts and
 
 {% data reusables.copilot.grok-promo-period %}
 
-Complimentary access to Grok Code Fast 1 is continuing past the previously announced end time. A new end date has not been set. We may update or conclude this promotion at any time. Regular pricing applies after the extension ends. See [AUTOTITLE](/copilot/reference/ai-models/supported-models#model-multipliers).
-
 These models are hosted on xAI. xAI operates {% data variables.copilot.copilot_grok_code %} in {% data variables.product.prodname_copilot %} under a zero data retention API policy. This means xAI commits that user content (both inputs sent to the model and outputs generated by the model):
 
 Will **not** be:
diff --git a/content/copilot/reference/ai-models/supported-models.md b/content/copilot/reference/ai-models/supported-models.md
index bb200cd4e228..e45b20d77846 100644
--- a/content/copilot/reference/ai-models/supported-models.md
+++ b/content/copilot/reference/ai-models/supported-models.md
@@ -98,6 +98,14 @@ Each model has a premium request multiplier, based on its complexity and resourc
 
 For more information about premium requests, see [AUTOTITLE](/copilot/managing-copilot/monitoring-usage-and-entitlements/about-premium-requests).
 
+<!-- expires 2025-12-05 -->
+
+<!-- When this expires, check with the stakeholder for release #20458 on whether or not this note can be removed and table updated -->
+
+{% data reusables.copilot.claude-promo-period %}
+
+<!-- end expires 2025-12-05 -->
+
 {% data reusables.copilot.model-multipliers %}
 
 ## Next steps
diff --git a/content/sponsors/receiving-sponsorships-through-github-sponsors/using-a-fiscal-host-to-receive-github-sponsors-payouts.md b/content/sponsors/receiving-sponsorships-through-github-sponsors/using-a-fiscal-host-to-receive-github-sponsors-payouts.md
index 1e347cec56b9..b429cf3a4eb0 100644
--- a/content/sponsors/receiving-sponsorships-through-github-sponsors/using-a-fiscal-host-to-receive-github-sponsors-payouts.md
+++ b/content/sponsors/receiving-sponsorships-through-github-sponsors/using-a-fiscal-host-to-receive-github-sponsors-payouts.md
@@ -24,6 +24,7 @@ When you sign up for a {% data variables.product.prodname_sponsors %} profile so
 * [Open Collective Europe](https://opencollective.com/europe)
 * [Open Source Collective](https://opencollective.com/opensource)
 * [Python Software Foundation](https://www.python.org/psf-landing/)
+* [Radiant Earth](https://radiant.earth/)
 * [Software in the Public Interest](https://www.spi-inc.org/)
 * [Software Underground](https://softwareunderground.org/)
 
diff --git a/data/reusables/copilot/claude-promo-period.md b/data/reusables/copilot/claude-promo-period.md
new file mode 100644
index 000000000000..ea437677b145
--- /dev/null
+++ b/data/reusables/copilot/claude-promo-period.md
@@ -0,0 +1 @@
+> [!Important] {% data variables.copilot.copilot_claude_opus_45 %} has a promotional multiplier of **1** through Friday, December 5, 2025. After that date, the multiplier will change to **3**.
diff --git a/data/tables/copilot/model-multipliers.yml b/data/tables/copilot/model-multipliers.yml
index 10ce00d0ad46..e84196b9e475 100644
--- a/data/tables/copilot/model-multipliers.yml
+++ b/data/tables/copilot/model-multipliers.yml
@@ -17,6 +17,10 @@
   multiplier_paid: 10
   multiplier_free: Not applicable
 
+- name: Claude Opus 4.5
+  multiplier_paid: 1 (**3** after Dec 5, 2025)
+  multiplier_free: Not applicable
+
 - name: Claude Sonnet 4
   multiplier_paid: 1
   multiplier_free: Not applicable
diff --git a/data/tables/copilot/model-release-status.yml b/data/tables/copilot/model-release-status.yml
index 78ef028992e9..d20ba3f0bacc 100644
--- a/data/tables/copilot/model-release-status.yml
+++ b/data/tables/copilot/model-release-status.yml
@@ -82,6 +82,13 @@
   ask_mode: true
   edit_mode: true
 
+- name: 'Claude Opus 4.5'
+  provider: 'Anthropic'
+  release_status: 'Public preview'
+  agent_mode: true
+  ask_mode: true
+  edit_mode: true
+
 - name: 'Claude Sonnet 4'
   provider: 'Anthropic'
   release_status: 'GA'
diff --git a/data/tables/copilot/model-supported-clients.yml b/data/tables/copilot/model-supported-clients.yml
index 151dc7bcc116..bb94dddca429 100644
--- a/data/tables/copilot/model-supported-clients.yml
+++ b/data/tables/copilot/model-supported-clients.yml
@@ -29,6 +29,14 @@
   xcode: true
   jetbrains: true
 
+- name: Claude Opus 4.5
+  dotcom: true
+  vscode: true
+  vs: false
+  eclipse: false
+  xcode: false
+  jetbrains: false
+
 - name: Claude Sonnet 4
   dotcom: true
   vscode: true
diff --git a/data/tables/copilot/model-supported-plans.yml b/data/tables/copilot/model-supported-plans.yml
index 63d94d9f89dd..c0db26603d48 100644
--- a/data/tables/copilot/model-supported-plans.yml
+++ b/data/tables/copilot/model-supported-plans.yml
@@ -26,6 +26,13 @@
   business: false
   enterprise: true
 
+- name: Claude Opus 4.5
+  free: false
+  pro: true
+  pro_plus: true
+  business: true
+  enterprise: true
+
 - name: Claude Sonnet 4
   free: false
   pro: true
diff --git a/data/variables/copilot.yml b/data/variables/copilot.yml
index 07fd47e4c8f5..ca733c518085 100644
--- a/data/variables/copilot.yml
+++ b/data/variables/copilot.yml
@@ -138,6 +138,7 @@ copilot_claude: 'Claude'
 copilot_claude_haiku_45: 'Claude Haiku 4.5'
 copilot_claude_opus: 'Claude Opus 4'
 copilot_claude_opus_41: 'Claude Opus 4.1'
+copilot_claude_opus_45: 'Claude Opus 4.5'
 copilot_claude_sonnet: 'Claude Sonnet'
 copilot_claude_sonnet_35: 'Claude Sonnet 3.5'
 copilot_claude_sonnet_37: 'Claude Sonnet 3.7'
diff --git a/src/landings/components/journey/JourneyLearningTracks.module.scss b/src/landings/components/journey/JourneyLearningTracks.module.scss
index 58e3fff5fda1..44b7dcf89f29 100644
--- a/src/landings/components/journey/JourneyLearningTracks.module.scss
+++ b/src/landings/components/journey/JourneyLearningTracks.module.scss
@@ -1,11 +1,12 @@
-.learningTracks {
+.journeyTracks {
+  margin-bottom: 1rem;
+  margin-left: 1rem;
+}
+
+.trackCard {
   border: 1px solid
     var(--borderColor-default, var(--color-border-default, #d1d9e0));
   border-radius: 12px;
-  padding: 1.5rem;
-  padding-bottom: 0.75rem;
-  margin-bottom: 1rem;
-  margin-left: 1rem;
   box-shadow:
     0px 1px 3px 0px rgba(31, 35, 40, 0.08),
     0px 1px 0px 0px rgba(31, 35, 40, 0.06);
@@ -15,6 +16,24 @@
     --bgColor-default,
     var(--color-canvas-default, #ffffff)
   );
+  transition: all 0.2s ease-in-out;
+
+  // journey card hover effect only when the card is not expanded
+  &:not([open]):hover {
+    box-shadow:
+      0 0.25rem 0.5rem 0 rgba(31, 35, 40, 0.12),
+      0 0.125rem 0.25rem 0 rgba(31, 35, 40, 0.08);
+    transform: translateY(-2px);
+    background-color: var(--bgColor-muted, var(--color-canvas-subtle));
+  }
+}
+
+.trackSummary {
+  list-style: none;
+  cursor: pointer;
+  display: block;
+  position: relative;
+  padding: 1.5rem 1.5rem 1.75rem 1.5rem;
 }
 
 .trackHeader {
@@ -26,25 +45,25 @@
   gap: 0.5rem;
 }
 
-.anchorLink {
-  color: var(--fgColor-default, var(--color-fg-default, #1f2328));
-  text-decoration: none;
-}
-
 .trackDescription {
-  margin: 0 0 1rem 0;
-  color: var(--fgColor-muted, var(--color-fg-muted, #656d76));
+  margin: 0;
+  padding-right: 2rem;
+
+  p {
+    margin: 0;
+    color: var(--fgColor-muted, var(--color-fg-muted, #656d76));
+  }
 }
 
 .expandButton {
-  top: 0;
-  right: 0;
+  top: 1.5rem;
+  right: 1.5rem;
 }
 
 .trackGuides {
-  margin-top: 1rem;
-  margin-bottom: 1rem;
-  padding-left: 0;
+  margin-top: 0;
+  margin-bottom: 0;
+  padding: 0 1.5rem 0.75rem 1.5rem;
   list-style: none;
   counter-reset: guide-counter;
 }
@@ -76,11 +95,6 @@
   line-height: 1;
 }
 
-.guideLink {
-  color: var(--fgColor-accent, var(--color-accent-fg, #0969da));
-  text-decoration: none;
-}
-
 /* Hide only the timeline line that extends below the last badge, preserve everything else */
 .timelineContainer :global(.Timeline-Item:last-child::before) {
   background: linear-gradient(
@@ -189,21 +203,20 @@
 }
 
 .mobileItem .mobileTile {
-  border: 1px solid
-    var(--borderColor-default, var(--color-border-default, #d1d9e0));
-  border-radius: 12px;
-  padding: 1rem;
   margin-top: 0.5rem;
   text-align: left;
-  box-shadow:
-    0px 1px 3px 0px rgba(31, 35, 40, 0.08),
-    0px 1px 0px 0px rgba(31, 35, 40, 0.06);
-  position: relative;
-  z-index: 3;
-  background-color: var(
-    --bgColor-default,
-    var(--color-canvas-default, #ffffff)
-  );
+
+  .trackCard {
+    z-index: 3;
+  }
+
+  .trackSummary {
+    padding: 1rem 1rem 1.75rem 1rem;
+  }
+
+  .trackGuides {
+    padding: 0 1rem 0.75rem 1rem;
+  }
 }
 
 /* Desktop: show Timeline component */
diff --git a/src/landings/components/journey/JourneyLearningTracks.tsx b/src/landings/components/journey/JourneyLearningTracks.tsx
index 03997a07873c..20cbcc355b34 100644
--- a/src/landings/components/journey/JourneyLearningTracks.tsx
+++ b/src/landings/components/journey/JourneyLearningTracks.tsx
@@ -1,6 +1,6 @@
 /* filepath: /workspaces/docs-internal/src/landings/components/journey/JourneyLearningTracks.tsx */
 import { ChevronDownIcon, ChevronUpIcon } from '@primer/octicons-react'
-import { Button, Details, Timeline, Token, useDetails } from '@primer/react'
+import { Details, Timeline, Token, useDetails } from '@primer/react'
 import { Link } from '@/frame/components/Link'
 import { JourneyTrack } from '@/journeys/lib/journey-path-resolver'
 import styles from './JourneyLearningTracks.module.scss'
@@ -14,40 +14,38 @@ export const JourneyLearningTracks = ({ tracks }: JourneyLearningTracksProps) =>
     return null
   }
 
-  const renderTrackContent = (track: JourneyTrack, trackIndex: number) => {
+  const renderTrackContent = (track: JourneyTrack) => {
     const { getDetailsProps, open } = useDetails({})
 
     return (
-      <>
-        <div className={styles.trackHeader}>
-          <h3 className="h4 text-bold">{track.title}</h3>
-          <Token text={`${track.guides?.length || 0} articles`} />
-        </div>
-        <p className={styles.trackDescription}>{track.description}</p>
-        <Details {...getDetailsProps()}>
-          <Button
-            as="summary"
-            variant="invisible"
-            className={`position-absolute ${styles.expandButton}`}
-            aria-label={
-              open
-                ? `Collapse article list ${trackIndex + 1}`
-                : `Expand article list ${trackIndex + 1}`
-            }
-          >
+      <Details
+        {...getDetailsProps()}
+        id={`track-${track.id}`}
+        className={styles.trackCard}
+        data-testid="journey-track"
+      >
+        <summary className={styles.trackSummary}>
+          <div className={styles.trackHeader}>
+            <h3 className="h4 text-bold">{track.title}</h3>
+            <Token text={`${track.guides?.length || 0} articles`} />
+          </div>
+          <div className={styles.trackDescription}>
+            <p>{track.description}</p>
+          </div>
+          <div className={`position-absolute ${styles.expandButton}`}>
             {open ? <ChevronUpIcon /> : <ChevronDownIcon />}
-          </Button>
-          <ol className={styles.trackGuides} data-testid="journey-articles">
-            {(track.guides || []).map((article: { href: string; title: string }) => (
-              <li key={article.title}>
-                <Link href={article.href} className={`text-semibold ${styles.guideLink}`}>
-                  {article.title}
-                </Link>
-              </li>
-            ))}
-          </ol>
-        </Details>
-      </>
+          </div>
+        </summary>
+        <ol className={styles.trackGuides} data-testid="journey-articles">
+          {(track.guides || []).map((article: { href: string; title: string }) => (
+            <li key={article.title}>
+              <Link href={article.href} className="text-semibold">
+                {article.title}
+              </Link>
+            </li>
+          ))}
+        </ol>
+      </Details>
     )
   }
 
@@ -60,10 +58,8 @@ export const JourneyLearningTracks = ({ tracks }: JourneyLearningTracksProps) =>
             return (
               <Timeline.Item key={track.id}>
                 <Timeline.Badge className={styles.timelineBadge}>{trackIndex + 1}</Timeline.Badge>
-                <Timeline.Body className={styles.learningTracks}>
-                  <div className="position-relative" data-testid="journey-track">
-                    {renderTrackContent(track, trackIndex)}
-                  </div>
+                <Timeline.Body className={styles.journeyTracks}>
+                  {renderTrackContent(track)}
                 </Timeline.Body>
               </Timeline.Item>
             )
@@ -76,11 +72,7 @@ export const JourneyLearningTracks = ({ tracks }: JourneyLearningTracksProps) =>
         {tracks.map((track, trackIndex) => (
           <div key={track.id} className={styles.mobileItem}>
             <div className={styles.mobileBadge}>{trackIndex + 1}</div>
-            <div className={styles.mobileTile}>
-              <div className="position-relative" data-testid="journey-track">
-                {renderTrackContent(track, trackIndex)}
-              </div>
-            </div>
+            <div className={styles.mobileTile}>{renderTrackContent(track)}</div>
             {trackIndex < tracks.length - 1 && <div className={styles.mobileConnector} />}
           </div>
         ))}