Install OpenVINO 2026.4.1 for YOLO26 and allow OpenVINO 2026 in the extra

The YOLO26 test script and its README installed an OpenVINO nightly that
OpenVINO has deleted, so the install fails. Install the 2026.4.1 release
instead, the same one the CI setup script uses.

The openvino pip extra, the docs and the runtime error message capped
OpenVINO below 2026.0.0, while CI runs the backend on 2026.4.1. Allow
2025.1.0 up to, but not including, 2027.0.0.

The extra still skips Linux aarch64 with Python 3.14. OpenVINO now
publishes builds there, but they need glibc 2.35, while the ExecuTorch
wheel needs only 2.28, so dropping the bound would make the extra fail to
install on older systems. The comment and the docs now give that reason.

Author: shoumikhin

.ci/scripts/test_yolo26.sh

@@ -76,8 +76,8 @@ if [[ "${MODE}" =~ .*openvino.* ]]; then
   OPENVINO=ON
   TARGET_LIBS="$TARGET_LIBS openvino_backend "
 
-  # Install specific OpenVINO runtime from pip.
-  $PYTHON_EXECUTABLE -m pip install --pre openvino==2026.1.0.dev20260131 --extra-index-url https://storage.openvinotoolkit.org/simple/wheels/nightly
+  # The same OpenVINO release that setup-openvino.sh installs.
+  $PYTHON_EXECUTABLE -m pip install openvino==2026.4.1
   $PYTHON_EXECUTABLE -m pip install -r backends/openvino/requirements.txt
 
   # Set OPENVINO_LIB_PATH so the C++ demo runner can also find libopenvino_c.so.

README-wheel.md

@@ -37,8 +37,8 @@ to run ExecuTorch `.pte` files, with some restrictions:
 * \[Linux and Windows] [OpenVINO](docs/source/build-run-openvino.md) backend is also linked into the
   prebuilt module. OpenVINO requires the runtime to be installed separately:
   `pip install executorch[openvino]`. For now the extra installs no runtime on Python 3.15,
-  or on Linux aarch64 with Python 3.14, because the OpenVINO versions it supports publish no
-  build there.
+  or on Linux aarch64 with Python 3.14. OpenVINO publishes no build for Python 3.15, and its
+  aarch64 builds for Python 3.14 need glibc 2.35 or newer.
 
 On Linux, macOS and Windows the runtime, kernels and backends also ship as shared libraries
 with headers and a CMake package, so a C++ application can link them without building

backends/openvino/README.md

@@ -20,7 +20,7 @@ On Linux and Windows, the OpenVINO backend is included in the ExecuTorch pip whe
 pip install executorch[openvino]
 ```
 
-For now the extra installs no runtime on Python 3.15, or on Linux aarch64 with Python 3.14, because the OpenVINO versions it supports publish no build there.
+For now the extra installs no runtime on Python 3.15, or on Linux aarch64 with Python 3.14. OpenVINO publishes no build for Python 3.15, and its aarch64 builds for Python 3.14 need glibc 2.35 or newer.
 
 The backend automatically discovers the OpenVINO C library from the pip-installed package, so no library search path setup is needed.
 

backends/openvino/runtime/OpenvinoBackend.cpp

@@ -212,7 +212,7 @@ bool OpenvinoBackend::ensure_loaded() const {
           Error,
           "OpenVINO runtime not found (loading '%s' failed: %s). "
           "Ensure '%s' can be found (%s), or install with: "
-          "pip install \"openvino>=2025.1.0,<2026.0.0\"",
+          "pip install \"openvino>=2025.1.0,<2027.0.0\"",
           to_utf8(effective_path).c_str(),
           error.c_str(),
           to_utf8(kDefaultLibName).c_str(),

docs/source/build-run-openvino.md

@@ -44,7 +44,8 @@ pip install executorch[openvino]
 ```
 
 For now the extra installs no runtime on Python 3.15, or on Linux aarch64 with Python
-3.14, because the OpenVINO versions it supports publish no build there.
+3.14. OpenVINO publishes no build for Python 3.15, and its aarch64 builds for Python 3.14
+need glibc 2.35 or newer.
 
 The backend automatically discovers the OpenVINO C library from the pip-installed
 package — no environment variable setup is needed.
@@ -60,7 +61,7 @@ If you need a custom build (different platform, custom configuration, etc.), fol
 Before you begin, ensure you have the OpenVINO runtime installed and configured on your system. For most users, we recommend installing it via pip:
 
 ```bash
-pip install "openvino>=2025.1.0,<2026.0.0"
+pip install "openvino>=2025.1.0,<2027.0.0"
 ```
 
 Alternatively, you can build OpenVINO from source or follow the official [OpenVINO installation guide](https://docs.openvino.ai/2025/get-started/install-openvino.html) for platform-specific options:

docs/source/using-executorch-cpp.md

@@ -273,7 +273,8 @@ Without it the delegate still registers and the program still links, and the fai
 when the model is loaded.
 
 For now the openvino extra installs no runtime on Python 3.15, or on Linux aarch64 with
-Python 3.14, because the OpenVINO versions it supports publish no build there.
+Python 3.14. OpenVINO publishes no build for Python 3.15, and its aarch64 builds for Python
+3.14 need glibc 2.35 or newer.
 
 The MLX delegate has a similar requirement. Its Metal kernels live in a separate `mlx.metallib`
 file, which MLX looks for next to whichever library holds MLX code. The wheel ships it beside the

examples/models/yolo26/README.md

@@ -16,9 +16,9 @@ To install ExecuTorch, follow this [guide](https://pytorch.org/executorch/stable
 
 - [OpenVINO backend installation guide](../../../backends/openvino/README.md#quick-start-pip-wheel)
 
-> **_NOTE:_**  Please install the OpenVINO nightly version that supports the YOLO26 model.
+> **_NOTE:_**  Please install the OpenVINO version that supports the YOLO26 model.
 ```bash
-python -m pip install --pre openvino==2026.1.0.dev20260131 --extra-index-url https://storage.openvinotoolkit.org/simple/wheels/nightly
+python -m pip install openvino==2026.4.1
 ```
 
 - [XNNPACK backend installation guide](https://pytorch.org/executorch/stable/tutorial-xnnpack-delegate-lowering.html#running-the-xnnpack-model-with-cmake)

pyproject.toml

@@ -86,9 +86,10 @@ ethos_u = [
   "tosa-tools==2026.5.0",
 ]
 openvino = [
-  # The OpenVINO versions in this range publish no build for Python 3.15, or for Linux
-  # aarch64 on Python 3.14, so without these bounds pip fails to install the extra there.
-  "openvino>=2025.1.0,<2026.0.0; (platform_system == 'Linux' or (platform_system == 'Windows' and platform_machine == 'AMD64')) and python_version < '3.15' and (platform_machine != 'aarch64' or python_version < '3.14')",
+  # OpenVINO publishes no build for Python 3.15, and its Linux aarch64 builds for Python
+  # 3.14 need glibc 2.35 while the wheel needs only 2.28. Without these bounds pip fails to
+  # install the extra on Python 3.15 and on those older aarch64 systems.
+  "openvino>=2025.1.0,<2027.0.0; (platform_system == 'Linux' or (platform_system == 'Windows' and platform_machine == 'AMD64')) and python_version < '3.15' and (platform_machine != 'aarch64' or python_version < '3.14')",
 ]
 
 [project.urls]