diff --git a/benchmarks/attention/benchmark_attention_jax.py b/benchmarks/attention/benchmark_attention_jax.py
index 54dd28505..b0b60cdb8 100644
--- a/benchmarks/attention/benchmark_attention_jax.py
+++ b/benchmarks/attention/benchmark_attention_jax.py
@@ -136,7 +136,7 @@ def bench_forward(self, warmup, iters, timings_dir):
                 self.dropout_rng_sharding,
             ],
         )
-        with self.mesh, fp8_autocast(mesh_resource=self.mesh_resource):
+        with jax.set_mesh(self.mesh), fp8_autocast(mesh_resource=self.mesh_resource):
             for _ in range(warmup):
                 customcall_fused_dpa_jit(*customcall_args)
 
@@ -227,7 +227,7 @@ def grad_func(func, *args, cp_reverse_out=False, **kwargs):
             ),
             out_shardings=(None, grad_shardings),
         )
-        with self.mesh, fp8_autocast(mesh_resource=self.mesh_resource):
+        with jax.set_mesh(self.mesh), fp8_autocast(mesh_resource=self.mesh_resource):
             for _ in range(warmup):
                 jitted_primitive(*customcall_args)
 
diff --git a/tests/jax/test_distributed_dense.py b/tests/jax/test_distributed_dense.py
index b8caf188d..818298ed8 100644
--- a/tests/jax/test_distributed_dense.py
+++ b/tests/jax/test_distributed_dense.py
@@ -1,3 +1,5 @@
+# This file was modified for portability to AMDGPU
+# Copyright (c) 2026, Advanced Micro Devices, Inc. All rights reserved.
 # Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # See LICENSE for license information.
@@ -127,7 +129,7 @@ def test_distributed_gemm(
 
         contracting_dims = ((2,), (0,))  # Contract on hidden_in dimension
 
-        with mesh, autocast(enabled=False, mesh_resource=mesh_resource):
+        with jax.set_mesh(mesh), autocast(enabled=False, mesh_resource=mesh_resource):
             # TE GEMM result
             te_result = _jitted_gemm(
                 x_sharded,
@@ -209,7 +211,7 @@ def test_te_distributed_dense_grad(
 
         contracting_dims = ((2,), (0,))
 
-        with mesh, autocast(enabled=False, mesh_resource=mesh_resource):
+        with jax.set_mesh(mesh), autocast(enabled=False, mesh_resource=mesh_resource):
             # Test gradients w.r.t. all inputs
             te_grad_func = jax.jit(
                 jax.value_and_grad(self._te_sum_dense, argnums=(0, 1, 2)),
diff --git a/tests/jax/test_distributed_layernorm.py b/tests/jax/test_distributed_layernorm.py
index 21359cedf..eb4497a0a 100644
--- a/tests/jax/test_distributed_layernorm.py
+++ b/tests/jax/test_distributed_layernorm.py
@@ -1,3 +1,5 @@
+# This file was modified for portability to AMDGPU
+# Copyright (c) 2026, Advanced Micro Devices, Inc. All rights reserved.
 # Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # See LICENSE for license information.
@@ -135,7 +137,7 @@ def ref_func(x, gamma, beta):
         )
         devices = np.asarray(jax.devices()[:device_count]).reshape(*mesh_shape)
         mesh = Mesh(devices, mesh_axes)
-        with mesh, autocast(enabled=True, recipe=fp8_recipe, mesh_resource=mesh_resource):
+        with jax.set_mesh(mesh), autocast(enabled=True, recipe=fp8_recipe, mesh_resource=mesh_resource):
             x_named_sharding = NamedSharding(mesh, x_pspec)
             g_named_sharding = NamedSharding(mesh, g_pspec)
             b_named_sharding = NamedSharding(mesh, b_pspec)
@@ -217,7 +219,7 @@ def ref_func(x, gamma):
         )
         devices = np.asarray(jax.devices()[:device_count]).reshape(*mesh_shape)
         mesh = Mesh(devices, mesh_axes)
-        with mesh, autocast(enabled=True, recipe=fp8_recipe, mesh_resource=mesh_resource):
+        with jax.set_mesh(mesh), autocast(enabled=True, recipe=fp8_recipe, mesh_resource=mesh_resource):
             x_named_sharding = NamedSharding(mesh, x_pspec)
             g_named_sharding = NamedSharding(mesh, g_pspec)
             x_ = jax.device_put(x, x_named_sharding)
diff --git a/tests/jax/test_distributed_layernorm_mlp.py b/tests/jax/test_distributed_layernorm_mlp.py
index 6a2f395b1..4ed9e3cf5 100644
--- a/tests/jax/test_distributed_layernorm_mlp.py
+++ b/tests/jax/test_distributed_layernorm_mlp.py
@@ -261,7 +261,7 @@ def _test_layernorm_mlp_grad(
             # Multi GPUs
             devices = np.asarray(jax.devices()[:device_count]).reshape(*mesh_shape)
             mesh = Mesh(devices, mesh_axes)
-            with mesh, autocast(
+            with jax.set_mesh(mesh), autocast(
                 enabled=quantization_recipe is not None,
                 recipe=quantization_recipe,
                 mesh_resource=mesh_resource,
@@ -452,7 +452,7 @@ def _test_layernorm_mlp(
             device_count, mesh_shape, mesh_axes, mesh_resource = mesh_config
             devices = np.asarray(jax.devices()[:device_count]).reshape(*mesh_shape)
             mesh = Mesh(devices, mesh_axes)
-            with mesh, autocast(
+            with jax.set_mesh(mesh), autocast(
                 enabled=use_fp8, recipe=quantization_recipe, mesh_resource=mesh_resource
             ):
                 ln_mlp_sharded = LayerNormMLP(
diff --git a/tests/jax/test_distributed_softmax.py b/tests/jax/test_distributed_softmax.py
index 0665baa4e..ff44f249c 100644
--- a/tests/jax/test_distributed_softmax.py
+++ b/tests/jax/test_distributed_softmax.py
@@ -1,3 +1,5 @@
+# This file was modified for portability to AMDGPU
+# Copyright (c) 2026, Advanced Micro Devices, Inc. All rights reserved.
 # Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # See LICENSE for license information.
@@ -109,7 +111,7 @@ def impl_test_softmax(
         collective_count_ref = self.generate_collectives_count_ref()
         devices = np.asarray(jax.devices()[:device_count]).reshape(*mesh_shape)
         mesh = Mesh(devices, mesh_axes)
-        with mesh, autocast(mesh_resource=mesh_resource):
+        with jax.set_mesh(mesh), autocast(mesh_resource=mesh_resource):
             x_named_sharding = NamedSharding(mesh, x_pspec)
             mask_named_sharding = NamedSharding(mesh, mask_pspec)
             x_ = jax.device_put(x, x_named_sharding)
diff --git a/tests/jax/test_fused_attn.py b/tests/jax/test_fused_attn.py
index 3b3db30bd..6e9cf23cb 100644
--- a/tests/jax/test_fused_attn.py
+++ b/tests/jax/test_fused_attn.py
@@ -907,7 +907,7 @@ def test_forward(self):
             ],
         )
 
-        with self.mesh, autocast(mesh_resource=self.mesh_resource):
+        with jax.set_mesh(self.mesh), autocast(mesh_resource=self.mesh_resource):
             primitive_out = customcall_fused_dpa_jit(*customcall_args)
             primitive_out = self.cp_inverse_reorder_fn(primitive_out)
 
@@ -924,7 +924,7 @@ def test_forward(self):
         assert_allclose(primitive_valid, reference_valid, dtype=self.dtype)
 
         if self.coll_count_ref is not None:
-            with self.mesh, autocast(mesh_resource=self.mesh_resource):
+            with jax.set_mesh(self.mesh), autocast(mesh_resource=self.mesh_resource):
                 target_hlo = (
                     customcall_fused_dpa_jit.lower(*customcall_args, **kwargs).compile().as_text()
                 )
@@ -1038,7 +1038,7 @@ def grad_func(func, *args, cp_reverse_out=False, **kwargs):
             )
         )
 
-        with self.mesh, autocast(mesh_resource=self.mesh_resource):
+        with jax.set_mesh(self.mesh), autocast(mesh_resource=self.mesh_resource):
             primitive_out, primitive_dgrad = jitted_primitive(*customcall_args)
 
         reference_out, reference_dgrad = jitted_reference(*args)
@@ -1126,7 +1126,7 @@ def check_dqkv(primitive, reference, pad, idx):
             )
 
         if self.coll_count_ref is not None:
-            with self.mesh, autocast(mesh_resource=self.mesh_resource):
+            with jax.set_mesh(self.mesh), autocast(mesh_resource=self.mesh_resource):
                 target_hlo = jitted_primitive.lower(*customcall_args).compile().as_text()
             assert_equal_collectives(target_hlo, self.coll_count_ref)
 
diff --git a/transformer_engine/jax/cpp_extensions/base.py b/transformer_engine/jax/cpp_extensions/base.py
index e65215bec..670f59cfe 100644
--- a/transformer_engine/jax/cpp_extensions/base.py
+++ b/transformer_engine/jax/cpp_extensions/base.py
@@ -223,7 +223,7 @@ def name_of_wrapper_p():
 
 
 for _name, _value in transformer_engine_jax.registrations().items():
-    ffi.register_ffi_target(_name, _value, platform="ROCM" if is_hip_extension else "CUDA")
+    ffi.register_ffi_target(_name, _value, platform="ROCM" if is_hip_extension() else "CUDA")
 
 
 def manage_primitives(enable_names=None, disable_names=None, disable_all_first=False):
diff --git a/transformer_engine/jax/sharding.py b/transformer_engine/jax/sharding.py
index 9b13412c1..a3df47f11 100644
--- a/transformer_engine/jax/sharding.py
+++ b/transformer_engine/jax/sharding.py
@@ -1,3 +1,5 @@
+# This file was modified for portability to AMDGPU
+# Copyright (c) 2026, Advanced Micro Devices, Inc. All rights reserved.
 # Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 #
 # See LICENSE for license information.
@@ -11,6 +13,7 @@
 """
 from contextlib import contextmanager
 from dataclasses import dataclass
+from packaging import version
 from typing import Callable, Optional
 import warnings
 
@@ -20,7 +23,8 @@
 from jax.sharding import PartitionSpec, get_abstract_mesh
 import numpy as np
 
-_PXLA_THREAD_RESOURCES = pxla.thread_resources
+if version.parse(jax.__version__) < version.parse("0.9.0"):
+    _PXLA_THREAD_RESOURCES = pxla.thread_resources
 
 # Axis Names
 BATCH_AXES = "nvte_batch"
@@ -39,9 +43,11 @@
 
 def _get_mesh():
     # Handle Mesh's set via `with mesh:`
-    mesh = _PXLA_THREAD_RESOURCES.env.physical_mesh
-    if mesh is not None and not mesh.empty:
-        return mesh
+    # ROCm: add JAX version guard for all backends
+    if version.parse(jax.__version__) < version.parse("0.9.0"):
+        mesh = _PXLA_THREAD_RESOURCES.env.physical_mesh
+        if mesh is not None and not mesh.empty:
+            return mesh
     # Handle Mesh's set via `jax.set_mesh(mesh)`
     return jax.sharding.get_abstract_mesh()
 
@@ -164,6 +170,31 @@ def filter_manual_axes(name_or_tuple):
         return x
 
     cleaned_pspec = PartitionSpec(*cleaned_axis_names)
+
+    # ROCm: JAX 0.9 compat (all backends) — when an AbstractMesh is active,
+    # jax.lax.with_sharding_constraint requires the input to already carry a
+    # NamedSharding. This affects both concrete arrays in eager mode and traced
+    # values inside jax.jit whose abstract sharding is not a NamedSharding (e.g.
+    # Module.init() traces over a single-device input and JAX propagates the
+    # SingleDeviceSharding through the Tracer). In both cases the constraint must
+    # be skipped because JAX raises unconditionally.
+    # A UserWarning is emitted only for concrete (non-Tracer) arrays so the user
+    # gets a visible signal in eager mode; the jit-traced skip is unavoidable and
+    # kept silent to avoid spurious warnings from traced code.
+    if hasattr(x, "sharding") and not isinstance(x.sharding, jax.sharding.NamedSharding):
+        if not isinstance(x, jax.core.Tracer):
+            warnings.warn(
+                f"with_sharding_constraint: the sharding constraint {cleaned_pspec!r} was not"
+                f" applied because the input array carries a {type(x.sharding).__name__} rather"
+                " than a NamedSharding. This typically happens in eager mode when arrays have not"
+                " yet been placed on a mesh (e.g. during model initialisation). Wrap the call in"
+                " jax.jit or ensure the array is on a named mesh before applying sharding"
+                " constraints.",
+                UserWarning,
+                stacklevel=2,
+            )
+        return x
+
     return jax.lax.with_sharding_constraint(x, cleaned_pspec)
 
 
@@ -359,6 +390,14 @@ def global_shard_guard(resource: MeshResource):
     old_resources = _GLOBAL_MESH_RESOURCE
     try:
         _GLOBAL_MESH_RESOURCE = resource
+        # ROCm: JAX 0.9 compat (all backends)
+        # Validate once at context-setup time, where get_abstract_mesh() correctly
+        # reflects the physical mesh.  Calling _validate_mesh_resource_configuration
+        # from global_mesh_resource() (i.e. on every access) breaks in JAX 0.9
+        # because get_abstract_mesh() returns an empty AbstractMesh when called
+        # from inside a custom_partitioning sharded_impl during jit(...).lower().
+        if resource is not None:
+            _validate_mesh_resource_configuration(resource)
         yield
     finally:
         _GLOBAL_MESH_RESOURCE = old_resources
@@ -375,7 +414,13 @@ def global_mesh_resource() -> MeshResource:
         " context. If you are not using multiple GPUs, you can use an empty MeshResource by"
         " wrapping your program in 'with global_shard_guard(MeshResource()):'"
     )
-    _validate_mesh_resource_configuration(_GLOBAL_MESH_RESOURCE)
+    # ROCm: JAX 0.9 compat (all backends)
+    # _validate_mesh_resource_configuration is intentionally NOT called here.
+    # Validation is done once in global_shard_guard() at context-setup time, where
+    # get_abstract_mesh() correctly reflects the physical mesh. Calling it here
+    # would break in JAX 0.9 when global_mesh_resource() is invoked from inside a
+    # custom_partitioning sharded_impl during jit(...).lower(), at which point
+    # get_abstract_mesh() returns an empty AbstractMesh.
     return _GLOBAL_MESH_RESOURCE
 
 
@@ -418,8 +463,11 @@ def all_reduce_max_along_all_axes_except_PP(x: jnp.array, mesh: jax.sharding.Mes
     Returns:
         Reduced tensor
     """
-    all_axes = get_all_mesh_axes()
-    for axis in all_axes:
+    # ROCm: JAX 0.9 compat (all backends)
+    # Use mesh.axis_names from the concrete mesh argument rather than calling
+    # get_all_mesh_axes() → _get_mesh() → get_abstract_mesh(), which returns
+    # empty in JAX 0.9 when called from inside a custom_partitioning sharded_impl.
+    for axis in mesh.axis_names:
         if axis != global_mesh_resource().pp_resource:
             x = lax_paral_op(x, jax.lax.pmax, axis, mesh)
     return x