diff --git a/src/librustdoc/clean/types.rs b/src/librustdoc/clean/types.rs
index c145929534d97..9687d014c8727 100644
--- a/src/librustdoc/clean/types.rs
+++ b/src/librustdoc/clean/types.rs
@@ -431,6 +431,10 @@ impl Item {
         self.deprecation(tcx).is_some_and(|deprecation| deprecation.is_in_effect())
     }
 
+    pub(crate) fn is_unstable(&self) -> bool {
+        self.stability.is_some_and(|x| x.is_unstable())
+    }
+
     pub(crate) fn inner_docs(&self, tcx: TyCtxt<'_>) -> bool {
         self.item_id.as_def_id().map(|did| inner_docs(tcx.get_all_attrs(did))).unwrap_or(false)
     }
diff --git a/src/librustdoc/formats/cache.rs b/src/librustdoc/formats/cache.rs
index 64e361d566c32..5a97d8e5b5f42 100644
--- a/src/librustdoc/formats/cache.rs
+++ b/src/librustdoc/formats/cache.rs
@@ -594,6 +594,7 @@ fn add_item_to_search_index(tcx: TyCtxt<'_>, cache: &mut Cache, item: &clean::It
     );
     let aliases = item.attrs.get_doc_aliases();
     let is_deprecated = item.is_deprecated(tcx);
+    let is_unstable = item.is_unstable();
     let index_item = IndexItem {
         ty: item.type_(),
         defid: Some(defid),
@@ -609,6 +610,7 @@ fn add_item_to_search_index(tcx: TyCtxt<'_>, cache: &mut Cache, item: &clean::It
         search_type,
         aliases,
         is_deprecated,
+        is_unstable,
     };
 
     cache.search_index.push(index_item);
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 86e8167dc3cda..57428b6f481e8 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -142,6 +142,7 @@ pub(crate) struct IndexItem {
     pub(crate) search_type: Option<IndexItemFunctionType>,
     pub(crate) aliases: Box<[Symbol]>,
     pub(crate) is_deprecated: bool,
+    pub(crate) is_unstable: bool,
 }
 
 /// A type used for the search index.
diff --git a/src/librustdoc/html/render/search_index.rs b/src/librustdoc/html/render/search_index.rs
index 30b534003da17..7c493653e77c0 100644
--- a/src/librustdoc/html/render/search_index.rs
+++ b/src/librustdoc/html/render/search_index.rs
@@ -616,6 +616,7 @@ impl SerializedSearchIndex {
                          parent,
                          trait_parent,
                          deprecated,
+                         unstable,
                          associated_item_disambiguator,
                      }| EntryData {
                         krate: *map.get(krate).unwrap(),
@@ -626,6 +627,7 @@ impl SerializedSearchIndex {
                         parent: parent.and_then(|path_id| map.get(&path_id).copied()),
                         trait_parent: trait_parent.and_then(|path_id| map.get(&path_id).copied()),
                         deprecated: *deprecated,
+                        unstable: *unstable,
                         associated_item_disambiguator: associated_item_disambiguator.clone(),
                     },
                 ),
@@ -896,6 +898,7 @@ struct EntryData {
     parent: Option<usize>,
     trait_parent: Option<usize>,
     deprecated: bool,
+    unstable: bool,
     associated_item_disambiguator: Option<String>,
 }
 
@@ -912,6 +915,7 @@ impl Serialize for EntryData {
         seq.serialize_element(&self.parent.map(|id| id + 1).unwrap_or(0))?;
         seq.serialize_element(&self.trait_parent.map(|id| id + 1).unwrap_or(0))?;
         seq.serialize_element(&if self.deprecated { 1 } else { 0 })?;
+        seq.serialize_element(&if self.unstable { 1 } else { 0 })?;
         if let Some(disambig) = &self.associated_item_disambiguator {
             seq.serialize_element(&disambig)?;
         }
@@ -946,6 +950,7 @@ impl<'de> Deserialize<'de> for EntryData {
                     v.next_element()?.ok_or_else(|| A::Error::missing_field("trait_parent"))?;
 
                 let deprecated: u32 = v.next_element()?.unwrap_or(0);
+                let unstable: u32 = v.next_element()?.unwrap_or(0);
                 let associated_item_disambiguator: Option<String> = v.next_element()?;
                 Ok(EntryData {
                     krate,
@@ -956,6 +961,7 @@ impl<'de> Deserialize<'de> for EntryData {
                     parent: Option::<i32>::from(parent).map(|path| path as usize),
                     trait_parent: Option::<i32>::from(trait_parent).map(|path| path as usize),
                     deprecated: deprecated != 0,
+                    unstable: unstable != 0,
                     associated_item_disambiguator,
                 })
             }
@@ -1283,6 +1289,7 @@ pub(crate) fn build_index(
                 ),
                 aliases: item.attrs.get_doc_aliases(),
                 is_deprecated: item.is_deprecated(tcx),
+                is_unstable: item.is_unstable(),
             });
         }
     }
@@ -1382,6 +1389,7 @@ pub(crate) fn build_index(
                         parent: None,
                         trait_parent: None,
                         deprecated: false,
+                        unstable: false,
                         associated_item_disambiguator: None,
                     }),
                     crate_doc,
@@ -1520,6 +1528,7 @@ pub(crate) fn build_index(
                 module_path,
                 exact_module_path,
                 deprecated: item.is_deprecated,
+                unstable: item.is_unstable,
                 associated_item_disambiguator: if let Some(impl_id) = item.impl_id
                     && let Some(parent_idx) = item.parent_idx
                     && associated_item_duplicates
diff --git a/src/librustdoc/html/static/js/rustdoc.d.ts b/src/librustdoc/html/static/js/rustdoc.d.ts
index 60df4fc10b8c5..555324c16f71a 100644
--- a/src/librustdoc/html/static/js/rustdoc.d.ts
+++ b/src/librustdoc/html/static/js/rustdoc.d.ts
@@ -243,6 +243,7 @@ declare namespace rustdoc {
         parent: number?,
         traitParent: number?,
         deprecated: boolean,
+        unstable: boolean,
         associatedItemDisambiguator: string?,
     }
 
@@ -292,6 +293,7 @@ declare namespace rustdoc {
         path: PathData?,
         functionData: FunctionData?,
         deprecated: boolean,
+        unstable: boolean,
         parent: RowParent,
         traitParent: RowParent,
     }
diff --git a/src/librustdoc/html/static/js/search.js b/src/librustdoc/html/static/js/search.js
index 9961c1447ec2a..ab7350c8c0e4d 100644
--- a/src/librustdoc/html/static/js/search.js
+++ b/src/librustdoc/html/static/js/search.js
@@ -1633,6 +1633,7 @@ class DocSearch {
          * parent,
          * trait_parent,
          * deprecated,
+         * unstable,
          * associated_item_disambiguator
          * @type {rustdoc.ArrayWithOptionals<[
          *     number,
@@ -1642,6 +1643,7 @@ class DocSearch {
          *     number,
          *     number,
          *     number,
+         *     number,
          * ], [string]>}
          */
         const raw = JSON.parse(encoded);
@@ -1653,7 +1655,8 @@ class DocSearch {
             parent: raw[4] === 0 ? null : raw[4] - 1,
             traitParent: raw[5] === 0 ? null : raw[5] - 1,
             deprecated: raw[6] === 1 ? true : false,
-            associatedItemDisambiguator: raw.length === 7 ? null : raw[7],
+            unstable: raw[7] === 1 ? true : false,
+            associatedItemDisambiguator: raw.length === 8 ? null : raw[8],
         };
     }
 
@@ -1946,6 +1949,7 @@ class DocSearch {
             path,
             functionData,
             deprecated: entry ? entry.deprecated : false,
+            unstable: entry ? entry.unstable : false,
             parent,
             traitParent,
         };
@@ -2858,6 +2862,13 @@ class DocSearch {
                         return a - b;
                     }
 
+                    // sort unstable items later
+                    a = Number(aai.unstable);
+                    b = Number(bbi.unstable);
+                    if (a !== b) {
+                        return a - b;
+                    }
+
                     // sort by crate (current crate comes first)
                     a = Number(aai.crate !== preferredCrate);
                     b = Number(bbi.crate !== preferredCrate);
diff --git a/tests/rustdoc-js-std/core-transmute.js b/tests/rustdoc-js-std/core-transmute.js
index 8c9910a32d7f1..b15f398902c31 100644
--- a/tests/rustdoc-js-std/core-transmute.js
+++ b/tests/rustdoc-js-std/core-transmute.js
@@ -3,9 +3,9 @@ const EXPECTED = [
     {
         'query': 'generic:T -> generic:U',
         'others': [
+            { 'path': 'core::mem', 'name': 'transmute' },
             { 'path': 'core::intrinsics::simd', 'name': 'simd_as' },
             { 'path': 'core::intrinsics::simd', 'name': 'simd_cast' },
-            { 'path': 'core::mem', 'name': 'transmute' },
         ],
     },
 ];
diff --git a/tests/rustdoc-js-std/transmute-fail.js b/tests/rustdoc-js-std/transmute-fail.js
index ddfb276194818..459e8dc3f0029 100644
--- a/tests/rustdoc-js-std/transmute-fail.js
+++ b/tests/rustdoc-js-std/transmute-fail.js
@@ -6,9 +6,9 @@ const EXPECTED = [
         // should-fail tag and the search query below:
         'query': 'generic:T -> generic:T',
         'others': [
+            { 'path': 'std::mem', 'name': 'transmute' },
             { 'path': 'std::intrinsics::simd', 'name': 'simd_as' },
             { 'path': 'std::intrinsics::simd', 'name': 'simd_cast' },
-            { 'path': 'std::mem', 'name': 'transmute' },
         ],
     },
 ];
diff --git a/tests/rustdoc-js-std/transmute.js b/tests/rustdoc-js-std/transmute.js
index f52e0ab14362d..a85b02e29947e 100644
--- a/tests/rustdoc-js-std/transmute.js
+++ b/tests/rustdoc-js-std/transmute.js
@@ -5,9 +5,9 @@ const EXPECTED = [
         // should-fail tag and the search query below:
         'query': 'generic:T -> generic:U',
         'others': [
+            { 'path': 'std::mem', 'name': 'transmute' },
             { 'path': 'std::intrinsics::simd', 'name': 'simd_as' },
             { 'path': 'std::intrinsics::simd', 'name': 'simd_cast' },
-            { 'path': 'std::mem', 'name': 'transmute' },
         ],
     },
 ];
diff --git a/tests/rustdoc-js/sort-stability.js b/tests/rustdoc-js/sort-stability.js
new file mode 100644
index 0000000000000..8c095619a0866
--- /dev/null
+++ b/tests/rustdoc-js/sort-stability.js
@@ -0,0 +1,9 @@
+const EXPECTED = [
+    {
+        'query': 'foo',
+        'others': [
+            {"path": "sort_stability::old", "name": "foo"},
+            {"path": "sort_stability::new", "name": "foo"},
+        ],
+    },
+];
diff --git a/tests/rustdoc-js/sort-stability.rs b/tests/rustdoc-js/sort-stability.rs
new file mode 100644
index 0000000000000..68662bb3aab6c
--- /dev/null
+++ b/tests/rustdoc-js/sort-stability.rs
@@ -0,0 +1,16 @@
+#![feature(staged_api)]
+#![stable(feature = "foo_lib", since = "1.0.0")]
+
+#[stable(feature = "old_foo", since = "1.0.1")]
+pub mod old {
+    /// Old, stable foo
+    #[stable(feature = "old_foo", since = "1.0.1")]
+    pub fn foo() {}
+}
+
+#[unstable(feature = "new_foo", issue = "none")]
+pub mod new {
+    /// New, unstable foo
+    #[unstable(feature = "new_foo", issue = "none")]
+    pub fn foo() {}
+}