diff --git a/docs/pages/base-ui/api/use-tooltip.json b/docs/pages/base-ui/api/use-tooltip.json
index 9a7c1df1df..2f55635a60 100644
--- a/docs/pages/base-ui/api/use-tooltip.json
+++ b/docs/pages/base-ui/api/use-tooltip.json
@@ -90,6 +90,7 @@
       },
       "required": true
     },
+    "instantOpen": { "type": { "name": "boolean", "description": "boolean" }, "required": true },
     "mounted": { "type": { "name": "boolean", "description": "boolean" }, "required": true },
     "setAnchorEl": {
       "type": {
diff --git a/docs/pages/experiments/tooltip.tsx b/docs/pages/experiments/tooltip.tsx
index 67fb09588e..a2b59a3aec 100644
--- a/docs/pages/experiments/tooltip.tsx
+++ b/docs/pages/experiments/tooltip.tsx
@@ -35,13 +35,21 @@ export const TooltipContent = styled(Tooltip.Content)`
 
     &[data-transition] {
       transition-property: opacity, transform;
-      transition-duration: 0.15s;
+      transition-duration: 0.2s;
       opacity: 0;
       transform: scale(0.9);
 
       &[data-status='opening'] {
         opacity: 1;
         transform: scale(1);
+
+        &[data-instant-open] {
+          transition-duration: 0s;
+        }
+      }
+
+      &[data-status='closing'][data-instant-open] {
+        transition-duration: 0s;
       }
     }
 
@@ -84,26 +92,36 @@ export default function TooltipTransitionExperiment() {
         fontFamily: '"IBM Plex Sans", sans-serif',
       }}
     >
-      <h2>Transition</h2>
-      <Tooltip.Group>
-        <Tooltip.Root>
-          <Tooltip.AnchorFragment>
-            <AnchorButton>Anchor</AnchorButton>
-          </Tooltip.AnchorFragment>
-          <TooltipContent data-transition sideOffset={7}>
-            Tooltip
-          </TooltipContent>
-        </Tooltip.Root>
-        <h2>Animation</h2>
-        <Tooltip.Root>
-          <Tooltip.AnchorFragment>
-            <AnchorButton>Anchor</AnchorButton>
-          </Tooltip.AnchorFragment>
-          <TooltipContent data-animation sideOffset={7}>
-            Tooltip
-          </TooltipContent>
-        </Tooltip.Root>
-      </Tooltip.Group>
+      <h2>Transition With Group</h2>
+      <div style={{ display: 'flex', gap: 5 }}>
+        <Tooltip.Group closeDelay={200}>
+          <Tooltip.Root>
+            <Tooltip.AnchorFragment>
+              <AnchorButton>Anchor</AnchorButton>
+            </Tooltip.AnchorFragment>
+            <TooltipContent data-transition sideOffset={7}>
+              Tooltip
+            </TooltipContent>
+          </Tooltip.Root>
+          <Tooltip.Root>
+            <Tooltip.AnchorFragment>
+              <AnchorButton>Anchor</AnchorButton>
+            </Tooltip.AnchorFragment>
+            <TooltipContent data-transition sideOffset={7}>
+              Tooltip
+            </TooltipContent>
+          </Tooltip.Root>
+        </Tooltip.Group>
+      </div>
+      <h2>Animation</h2>
+      <Tooltip.Root>
+        <Tooltip.AnchorFragment>
+          <AnchorButton>Anchor</AnchorButton>
+        </Tooltip.AnchorFragment>
+        <TooltipContent data-animation sideOffset={7}>
+          Tooltip
+        </TooltipContent>
+      </Tooltip.Root>
     </div>
   );
 }
diff --git a/docs/translations/api-docs/use-tooltip/use-tooltip.json b/docs/translations/api-docs/use-tooltip/use-tooltip.json
index 2b9cd6f1b9..1e0a777579 100644
--- a/docs/translations/api-docs/use-tooltip/use-tooltip.json
+++ b/docs/translations/api-docs/use-tooltip/use-tooltip.json
@@ -50,6 +50,9 @@
     "floatingContext": { "description": "The Floating UI context of the tooltip element." },
     "getAnchorProps": { "description": "Props to spread on the anchor element." },
     "getContentProps": { "description": "Props to spread on the tooltip element." },
+    "instantOpen": {
+      "description": "If <code>true</code>, the tooltip is in a phase where it should be instantly open while in a group."
+    },
     "mounted": {
       "description": "Whether the tooltip is mounted, including CSS transitions or animations."
     },
diff --git a/packages/mui-base/src/Tooltip/TooltipContent.tsx b/packages/mui-base/src/Tooltip/TooltipContent.tsx
index fc76028fe9..1879ba339c 100644
--- a/packages/mui-base/src/Tooltip/TooltipContent.tsx
+++ b/packages/mui-base/src/Tooltip/TooltipContent.tsx
@@ -117,6 +117,7 @@ const TooltipContent = React.forwardRef(function TooltipContent(
     ['data-side' as string]: tooltip.side,
     ['data-alignment' as string]: tooltip.alignment,
     ['data-status' as string]: tooltip.status,
+    ['data-instant-open' as string]: tooltip.instantOpen || undefined,
     ...otherProps,
   };
 
diff --git a/packages/mui-base/src/useTooltip/useTooltip.ts b/packages/mui-base/src/useTooltip/useTooltip.ts
index 7de7ba3800..2550292089 100644
--- a/packages/mui-base/src/useTooltip/useTooltip.ts
+++ b/packages/mui-base/src/useTooltip/useTooltip.ts
@@ -184,11 +184,20 @@ export function useTooltip(params: UseTooltipParameters): UseTooltipReturnValue
     return undefined;
   }, [keepMounted, mounted, elements, update]);
 
+  const { delay: groupDelay, isInstantPhase, currentId } = useDelayGroup(context);
+
   const renderedSide = getSide(renderedPlacement);
   const renderedAlignment = getAlignment(renderedPlacement) || 'center';
   const isHidden = hideWhenDetached && middlewareData.hide?.referenceHidden;
 
-  const { delay: groupDelay } = useDelayGroup(context);
+  let isInstantOpen = isInstantPhase;
+  if (isInstantPhase) {
+    if (open) {
+      isInstantOpen = true;
+    } else if (currentId === context.floatingId) {
+      isInstantOpen = false;
+    }
+  }
 
   const hover = useHover(context, {
     delay:
@@ -232,6 +241,7 @@ export function useTooltip(params: UseTooltipParameters): UseTooltipReturnValue
           ['data-side' as string]: renderedSide,
           ['data-alignment' as string]: renderedAlignment,
           ['data-status' as string]: status,
+          ['data-instant-open' as string]: isInstantOpen || undefined,
           style: {
             ...floatingStyles,
             maxWidth: 'var(--available-width)',
@@ -255,6 +265,7 @@ export function useTooltip(params: UseTooltipParameters): UseTooltipReturnValue
       status,
       setMounted,
       refs,
+      isInstantOpen,
     ],
   );
 
@@ -270,6 +281,7 @@ export function useTooltip(params: UseTooltipParameters): UseTooltipReturnValue
       floatingContext: context,
       side: renderedSide,
       alignment: renderedAlignment,
+      instantOpen: isInstantOpen,
     }),
     [
       status,
@@ -281,6 +293,7 @@ export function useTooltip(params: UseTooltipParameters): UseTooltipReturnValue
       context,
       renderedSide,
       renderedAlignment,
+      isInstantOpen,
     ],
   );
 }
diff --git a/packages/mui-base/src/useTooltip/useTooltip.types.ts b/packages/mui-base/src/useTooltip/useTooltip.types.ts
index 041c6ec2b4..cf80635e02 100644
--- a/packages/mui-base/src/useTooltip/useTooltip.types.ts
+++ b/packages/mui-base/src/useTooltip/useTooltip.types.ts
@@ -154,6 +154,10 @@ export interface UseTooltipReturnValue {
    * The status of the tooltip element when considering CSS transitions or animations.
    */
   status: Status;
+  /**
+   * If `true`, the tooltip is in a phase where it should be instantly open while in a group.
+   */
+  instantOpen: boolean;
 }
 
 export interface UseTooltipOpenStateReturnValue {