diff --git a/tensor-shapes/pyrefly-numpy-stubs/numpy-stubs/__init__.pyi b/tensor-shapes/pyrefly-numpy-stubs/numpy-stubs/__init__.pyi
index 7cf497070f..38a202930b 100644
--- a/tensor-shapes/pyrefly-numpy-stubs/numpy-stubs/__init__.pyi
+++ b/tensor-shapes/pyrefly-numpy-stubs/numpy-stubs/__init__.pyi
@@ -510,7 +510,35 @@ class bool_(generic):
 
 class float16(floating): ...
 class float32(floating): ...
-class float64(floating): ...
+
+class float64(floating):
+    # Narrow builtin-float support without inheriting float (which
+    # rewrites reflected ops like ``1j * float64`` via complex*float).
+    @overload
+    def __sub__(self, other: float, /) -> float64: ...
+    @overload
+    def __sub__(self, other: _NumberScalar, /) -> number: ...
+    @overload
+    def __rsub__(self, other: float, /) -> float64: ...
+    @overload
+    def __rsub__(self, other: _NumberScalar, /) -> number | complex: ...
+    @overload
+    def __gt__(self, other: float, /) -> bool_: ...
+    @overload
+    def __gt__(self, other: _NumberScalar, /) -> bool_: ...
+    @overload
+    def __ge__(self, other: float, /) -> bool_: ...
+    @overload
+    def __ge__(self, other: _NumberScalar, /) -> bool_: ...
+    @overload
+    def __lt__(self, other: float, /) -> bool_: ...
+    @overload
+    def __lt__(self, other: _NumberScalar, /) -> bool_: ...
+    @overload
+    def __le__(self, other: float, /) -> bool_: ...
+    @overload
+    def __le__(self, other: _NumberScalar, /) -> bool_: ...
+
 class longdouble(floating): ...
 class complex64(complexfloating): ...
 class complex128(complexfloating): ...
diff --git a/tensor-shapes/pyrefly-numpy-stubs/test/test_dtype_properties.py b/tensor-shapes/pyrefly-numpy-stubs/test/test_dtype_properties.py
index 8a6ad3710e..1a80cb1b4e 100644
--- a/tensor-shapes/pyrefly-numpy-stubs/test/test_dtype_properties.py
+++ b/tensor-shapes/pyrefly-numpy-stubs/test/test_dtype_properties.py
@@ -107,6 +107,23 @@ def test_numeric_scalar_operations() -> None:
         np.float64(1j)  # E: not assignable
 
 
+def test_float64_operations_with_builtin_float() -> None:
+    real = np.float64(2.0)
+    builtin_float = 1.0
+
+    # Ops only — do not inherit builtins.float (breaks 1j * float64 typing).
+    assert_type(real - builtin_float, np.float64)
+    assert_type(builtin_float - real, np.float64)
+    assert_type(real > builtin_float, np.bool_)
+    assert_type(builtin_float > real, np.bool_)
+    assert_shape((real - builtin_float).shape, ())
+    assert_shape((builtin_float - real).shape, ())
+    assert real - builtin_float == 1.0
+    assert builtin_float - real == -1.0
+    assert real > builtin_float
+    assert not builtin_float > real
+
+
 def test_integer_scalar_array_index() -> None:
     index = np.ones((), dtype=np.int64)
     assert_shape(index.shape, ())