diff --git a/Doc/c-api/gcsupport.rst b/Doc/c-api/gcsupport.rst
index 9c9c97f7b853d8..7a6f55ae21dc90 100644
--- a/Doc/c-api/gcsupport.rst
+++ b/Doc/c-api/gcsupport.rst
@@ -100,7 +100,7 @@ rules:
       * :c:member:`~PyTypeObject.tp_alloc`
 
 
-.. c:function:: PyObject* PyUnstable_Object_GC_NewWithExtraData(PyTypeObject *type, size_t extra_size)
+.. c:function:: PyObject* PyObject_GC_NewWithExtraData(PyTypeObject *type, size_t extra_size)
 
    Analogous to :c:macro:`PyObject_GC_New` but allocates *extra_size*
    bytes at the end of the object (at offset
@@ -115,15 +115,18 @@ rules:
    :c:func:`PyObject_GC_Del` (usually called via the object's
    :c:member:`~PyTypeObject.tp_free` slot).
 
-   .. warning::
-      The function is marked as unstable because the final mechanism
-      for reserving extra data after an instance is not yet decided.
-      For allocating a variable number of fields, prefer using
-      :c:type:`PyVarObject` and :c:member:`~PyTypeObject.tp_itemsize`
-      instead.
+   For allocating a variable number of fields, prefer using
+   :c:type:`PyVarObject` and :c:member:`~PyTypeObject.tp_itemsize`
+   instead.
 
    .. versionadded:: 3.12
 
+   .. versionchanged:: 3.15
+      The function is now part of the :ref:`limited API <limited-c-api>`.
+
+      Previously, the function was named
+      ``PyUnstable_Object_GC_NewWithExtraData``.
+
 
 .. c:macro:: PyObject_GC_Resize(TYPE, op, newsize)
 
diff --git a/Doc/c-api/typeobj.rst b/Doc/c-api/typeobj.rst
index c3960d6ff87ec8..86f545decc8863 100644
--- a/Doc/c-api/typeobj.rst
+++ b/Doc/c-api/typeobj.rst
@@ -599,7 +599,7 @@ and :c:data:`PyType_Type` effectively act as defaults.)
    :c:member:`!tp_itemsize` field.  For a type with fixed-length instances, all
    instances have the same size, given in :c:member:`!tp_basicsize`.
    (Exceptions to this rule can be made using
-   :c:func:`PyUnstable_Object_GC_NewWithExtraData`.)
+   :c:func:`PyObject_GC_NewWithExtraData`.)
 
    For a type with variable-length instances, the instances must have an
    :c:member:`~PyVarObject.ob_size` field, and the instance size is
diff --git a/Doc/data/stable_abi.dat b/Doc/data/stable_abi.dat
index 4a7fbdf60bfb43..2ba0a99eaf493d 100644
--- a/Doc/data/stable_abi.dat
+++ b/Doc/data/stable_abi.dat
@@ -585,6 +585,7 @@ func,PyObject_Free,3.2,,
 func,PyObject_GC_Del,3.2,,
 func,PyObject_GC_IsFinalized,3.9,,
 func,PyObject_GC_IsTracked,3.9,,
+func,PyObject_GC_NewWithExtraData,3.15,,
 func,PyObject_GC_Track,3.2,,
 func,PyObject_GC_UnTrack,3.2,,
 func,PyObject_GenericGetAttr,3.2,,
diff --git a/Include/cpython/objimpl.h b/Include/cpython/objimpl.h
index e0c2ce286f13ce..fd502b1a8f2a05 100644
--- a/Include/cpython/objimpl.h
+++ b/Include/cpython/objimpl.h
@@ -83,8 +83,7 @@ PyAPI_FUNC(int) PyType_SUPPORTS_WEAKREFS(PyTypeObject *type);
 
 PyAPI_FUNC(PyObject **) PyObject_GET_WEAKREFS_LISTPTR(PyObject *op);
 
-PyAPI_FUNC(PyObject *) PyUnstable_Object_GC_NewWithExtraData(PyTypeObject *,
-                                                             size_t);
+
 
 
 /* Visit all live GC-capable objects, similar to gc.get_objects(None). The
diff --git a/Include/objimpl.h b/Include/objimpl.h
index 56472a72e42d34..731a16a2f03277 100644
--- a/Include/objimpl.h
+++ b/Include/objimpl.h
@@ -182,6 +182,8 @@ PyAPI_FUNC(void) PyObject_GC_Del(void *);
 #define PyObject_GC_NewVar(type, typeobj, n) \
     _Py_CAST(type*, _PyObject_GC_NewVar((typeobj), (n)))
 
+PyAPI_FUNC(PyObject *) PyObject_GC_NewWithExtraData(PyTypeObject *, size_t);
+
 PyAPI_FUNC(int) PyObject_GC_IsTracked(PyObject *);
 PyAPI_FUNC(int) PyObject_GC_IsFinalized(PyObject *);
 
diff --git a/Lib/test/test_stable_abi_ctypes.py b/Lib/test/test_stable_abi_ctypes.py
index ed0868e0017fce..e421024a0199d2 100644
--- a/Lib/test/test_stable_abi_ctypes.py
+++ b/Lib/test/test_stable_abi_ctypes.py
@@ -573,6 +573,7 @@ def test_windows_feature_macros(self):
     "PyObject_GC_Del",
     "PyObject_GC_IsFinalized",
     "PyObject_GC_IsTracked",
+    "PyObject_GC_NewWithExtraData",
     "PyObject_GC_Track",
     "PyObject_GC_UnTrack",
     "PyObject_GenericGetAttr",
diff --git a/Misc/NEWS.d/next/C_API/2026-04-13-00-00-00.gh-issue-148498.GCNewExtra.rst b/Misc/NEWS.d/next/C_API/2026-04-13-00-00-00.gh-issue-148498.GCNewExtra.rst
new file mode 100644
index 00000000000000..68e63d2e860ed1
--- /dev/null
+++ b/Misc/NEWS.d/next/C_API/2026-04-13-00-00-00.gh-issue-148498.GCNewExtra.rst
@@ -0,0 +1,3 @@
+Rename :c:func:`!PyUnstable_Object_GC_NewWithExtraData` to
+:c:func:`PyObject_GC_NewWithExtraData` and add it to the
+:ref:`limited API <limited-c-api>`.
diff --git a/Misc/stable_abi.toml b/Misc/stable_abi.toml
index 606a0a88d26cf2..453b2748bab96e 100644
--- a/Misc/stable_abi.toml
+++ b/Misc/stable_abi.toml
@@ -2706,3 +2706,5 @@
     # Note: The `_reserved` member of this struct is for interal use only.
     # (The definition of 'full-abi' was clarified when this entry was added.)
     struct_abi_kind = 'full-abi'
+[function.PyObject_GC_NewWithExtraData]
+    added = '3.15'
diff --git a/Modules/_testcapi/gc.c b/Modules/_testcapi/gc.c
index 863cb52980f942..69f035fcb923af 100644
--- a/Modules/_testcapi/gc.c
+++ b/Modules/_testcapi/gc.c
@@ -228,7 +228,7 @@ static PyObject *
 obj_extra_data_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
     size_t extra_size = sizeof(PyObject *);
-    PyObject *obj = PyUnstable_Object_GC_NewWithExtraData(type, extra_size);
+    PyObject *obj = PyObject_GC_NewWithExtraData(type, extra_size);
     if (obj == NULL) {
         return PyErr_NoMemory();
     }
diff --git a/PC/python3dll.c b/PC/python3dll.c
index abbe35c342c13e..3d43c9a91d7773 100755
--- a/PC/python3dll.c
+++ b/PC/python3dll.c
@@ -510,6 +510,7 @@ EXPORT_FUNC(PyObject_Free)
 EXPORT_FUNC(PyObject_GC_Del)
 EXPORT_FUNC(PyObject_GC_IsFinalized)
 EXPORT_FUNC(PyObject_GC_IsTracked)
+EXPORT_FUNC(PyObject_GC_NewWithExtraData)
 EXPORT_FUNC(PyObject_GC_Track)
 EXPORT_FUNC(PyObject_GC_UnTrack)
 EXPORT_FUNC(PyObject_GenericGetAttr)
diff --git a/Python/gc.c b/Python/gc.c
index 284ac725d37ac6..5b0d48601bfdeb 100644
--- a/Python/gc.c
+++ b/Python/gc.c
@@ -2489,7 +2489,7 @@ _PyObject_GC_NewVar(PyTypeObject *tp, Py_ssize_t nitems)
 }
 
 PyObject *
-PyUnstable_Object_GC_NewWithExtraData(PyTypeObject *tp, size_t extra_size)
+PyObject_GC_NewWithExtraData(PyTypeObject *tp, size_t extra_size)
 {
     size_t presize = _PyType_PreHeaderSize(tp);
     size_t size = _PyObject_SIZE(tp) + extra_size;
diff --git a/Python/gc_free_threading.c b/Python/gc_free_threading.c
index 4b46ca04f56b20..90dd01948b1a0a 100644
--- a/Python/gc_free_threading.c
+++ b/Python/gc_free_threading.c
@@ -2983,7 +2983,7 @@ _PyObject_GC_NewVar(PyTypeObject *tp, Py_ssize_t nitems)
 }
 
 PyObject *
-PyUnstable_Object_GC_NewWithExtraData(PyTypeObject *tp, size_t extra_size)
+PyObject_GC_NewWithExtraData(PyTypeObject *tp, size_t extra_size)
 {
     size_t presize = _PyType_PreHeaderSize(tp);
     size_t size = _PyObject_SIZE(tp) + extra_size;